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Since it's hard to talk about Undertale without spoiling it, it's safe to say there are spoilers in this. Be warned!

Napstablook
Flavour Text*Like all monsters, they don't seem to have a sense of humour... [check]
*Missed the memo and is the same difficulty as normal. [check in hard mode]
*Napstablook is here. [encounter]
*Napstablook is here. Again. [encounter in hard mode]
*Napstablook is acting aloof. [neutral]
*Napstablook is staring at you, trying to be intimidating. [neutral]
*Napstablook looks bored. [neutral]
*They don't smell very nice. [neutral]
*You try and smile at Napstablook. [cheer]
*Napstablook looks more confused than mad. [turn after cheer]
*You were going to tell a joke, but remember Napstablook has no sense of humour. You decide to pull a practical joke on Flowey instead. [cheer #2]
*Flowey looks very annoyed... but Napstablook is smiling! [turn after cheer #2]
*Napstablook wants to show you something. [cheer #3]
*Napstablook wants to know what you think. [turn after cheer #3]
*You look at Napstablook the same way they are looking at you. [threat]

Quotes"hey! i am REALLY funny!" [check]
"nnnnnnggghhh." [neutral]
"just pluggin along..." [neutral]
"leave me alone." [neutral]
"are you serious?" [flirt]
"go ahead. i'm not afraid." [threat]
"go away." [cheer]
"seriously, go away!" [cheer #2]
"fine. i'll show you something cool. i call it 'dapper blook'. you'd better like it."
"heh, thought so." [any other action than cheer or flirt after showing dapper blook]
"oh... no..." [flirt after dapper blook]
"fine..." [cheer after dapper blook]

Toriel
Flavour Text*Knows best for you...? [check]
*TORIEL blocks the way! [encounter]
*Toriel looks at you strangely. [neutral]
*Toriel prepares a magical attack. [neutral]
*Toriel laughs evilly. [neutral]
*... [when she stops attacking]
*You couldn't think of any topics you'd be comfortable discussing. [talk]
*All you can think about is ways to mash up snails. [talk #2]
*Talking about mashing up snails probably won't resolve this... [talk #3+]
*You thought about telling Toriel you saw her die. | But she'll probably go through with it if you tell her. [talk if you've killed her before]
*You can't show mercy without fighting or running away. [talk #2 if you've killed her before]
*Not really worth talking to. [genocide route]

Quotes"...." [spare]
".... ...." [spare #2]
".... .... ...." [spare #3]
"...?" [spare #4]
"Stop!" [spare #5]
"Just fight me!" [spare #6]
"You're not proving anything by doing this!" [spare #7]
"Attack me or go back!" [spare #8]
"STOP IT!" [spare #9]
"Don't look at me like that! You know what I want!" [spare #10]
"..." [spare #11]
"... ..." [spare #12]
"I know you want to leave this place, but..." [spare #13]
"But just go upstairs!" [spare #14]
"I'll try not to kill you, promise!" [spare #15]
"I know you're scared of me, but..." [spare #16]
"I want to be a better person." [spare #17]
"Why are you making this so hard for me?" [spare #18]
"Go upstairs! I promise we'll have good lives!" [spare #19]
"..." [spare #20]
"Ha ha..." [spare #21]
"Pathetic, is it not? No child has ever believed me. You are no different, are you? You wouldn't give me a chance." [spare #21]
"..." [spare #23]
"... I understand. You wouldn't be happy trapped down here with someone like me. The Ruins are not right for humans to live in. My second chance, my fear... for you, my child... I will put them aside." [spare #24]
"Urgh... you are stonger than I thought... listen to me, small one... if you go beyond this door... keep walking east for as long as you can... you'll eventually reach an exit. ... .... ASGORE. Do not let ASGORE take your soul! His plan can't be allowed to succeed anymore! Be good, alright? My... child... [killed, neutral route]
"You... at my most vulnerable moment... to think that I was worried you wouldn't fit in with the monsters out there! You are no different to them! Eheheheheh!" [killed after she stops attacking]
"Y... you... really hate me that much...? Now I see who I was really protecting by trapping you here! Not you... but them! Eheheheheh!" [killed, genocide route]

Papyrus
Flavour Text*He likes to say "NYAH HAH HAH!" [check]
*Forgettable. [check on genocide route]
*Papyrus blocks the way! [encounter]
*You're blue now. [after Papyrus' blue attack]
*Papyrus is acting tough. [neutral]
*Papyrus whispers "Nyah hah hah!" [neutral]
*Papyrus is preparing a bone attack. [neutral]
*Papyrus is cackling. [neutral]
*Papyrus prepares a non-bone attack... but they won't kill you. He fixes his mistake. [neutral]
*Papyrus is rattling his bones, so to speak. [neutral]
*Smells like despair. [neutral]
*Papyrus thinks about what Sans might be doing and is frowning. [neutral]
*Papyrus is thinking about what to wear for his date. [if flirted with]
*Papyrus is thinking about what to cook for his date. [if flirted with]
*Papyrus dabs some Bone Cologne behind his ear. [if flirted with]
*Papyrus dabs some blood behind his ear. [if flirted with]
*Papyrus realises he doesn't have ears. [if flirted with]
*You INSULT, but to no avail. Seems ACTing won't have any effect. [insult after blue attack]
*You FLIRT, but to no avail. Seems ACTing won't have any effect. [flirt after blue attack]
*You throw the stick. Papyrus catches it and snaps it. [using stick]
*Papyrus is preparing a regular attack. [after he tries to use his special attack]
*Papyrus is sparing you... for now. [after his "completely normal attack"/genocide]

Quotes"WHAT!? FLIRTING!? SO YOU FINALLY REVEAL YOUR ULTIMATE FEELINGS! TOO BAD FOR YOU! I'M A SKELETON WITH VERY HIGH STANDARDS!" [flirt]
"OH NO!!! YOU'RE MEETING ALL MY STANDARDS!!!" [I can make traps]
"OH NO!!! THAT SELF-LOATHING... IT REMINDS ME OF... SANS! YOU'RE MEETING ALL MY STANDARDS!!! [I have zero redeeming qualities]
"I GUESS THIS MEANS I HAVE TO GO ON A DATE OF SORTS WITH YOU LATER!! AFTER I KILL YOU!" [flirt]
"STOP! WE'LL DATE LATER! WHEN YOU'RE DEAD!" [flirt #2]
"I SAID WE'LL DATE LATER!" [flirt #3+]
"HOW SELFISH... YOU WANT MY FIGHT TO LAST LONGER, HUH!? SO YOU'LL BE ABLE TO KEEP ME FIGHTING YOU WHEN I'VE GOT BETTER TO DO!?" [insult]
"STOP INSULTING ME! YOU'RE MAKING ME REALLY MAD!" [insult #2]
"HOW DARE YOU WASTE YOUR WORDS ON ME?" [insult #3]
"DON'T WASTE YOUR SCREAMS!" [insult #4+]
"SO YOU'RE SERIOUS..." [fight]
"SO YOU WON'T FIGHT, HUH? GUESS WE'LL HAVE TO DO THIS THE HARD WAY!" [spare]
"I BET YOU CAN'T HANDLE MY FABLED BLUE ATTACK!"
"YOU'RE BLUE NOW. THAT'S MY ATTACK! NYAH HAH HAH HAH HAH HAH HAH HAH HAH!"
"BEHOLD!" [if not flirted with or hit by the blue attack]
"HMM... I WONDER WHAT I SHOULD WEAR..." [if flirted with]
"WHAT? A DATE? HMPH. I'M NOT THINKING ABOUT THAT AT THE MOMENT." [if flirted with]
"TRY HOLDING THE UP BUTTON TO JUMP! OR NOT! IT DOESN'T REALLY MATTER!" [if hit on the first blue attack]
"HOW HIGH IS IT POSSIBLE FOR HUMANS TO JUMP!?" [if hit by both blue attacks]
"FOR CRYING OUT LOUD! HOLD UP LONGER TO JUMP HIGHER!!!" [if hit by blue attacks continually]
"DON'T MAKE ME USE MY SPECIAL ATTACK!"
"I CAN ALMOST TASTE MY FUTURE POPULARITY!"
"PAPYRUS: HEAD OF THE ROYAL GUARD!"
"PAPYRUS: UNPARALLELED SPAGHETTORE!"
"UNDYNE WILL BE REALLY PROUD OF ME!"
"THE KING WILL TRIM A VERY DANGEROUS AND COOL-LOOKING HEDGE IN THE SHAPE OF MY SMILE!"
"SANS WILL... WELL, HE WILL TREMBLE IN HIS SLIPPERS!"
"I'LL HAVE LOTS OF ADMIRERS! BUT HOW WILL I KNOW IF PEOPLE SECRETLY LIKE ME?"
"SOMEONE LIKE YOU IS REALLY RARE. I'M SURE THEY'LL HAVE FUN MAKING YOU INTO A BURGER! NYEH HEH HEH!"
"THAT'S NOT UNTIL I'VE KILLED YOU, THOUGH!"
"BUT WHO CARES? GIVE UP!"
"GIVE UP OR FACE MY SPECIAL ATTACK!"
"VERY SOON I WILL USE MY SPECIAL ATTACK!"
"JUST A MINUTE BEFORE I UNLEASH MY SPECIAL ATTACK!"
"THIS IS YOUR LAST CHANCE... BEFORE I USE MY SPECIAL ATTACK!"
"BEHOLD...! MY SPECIAL ATTACK!"
"WHAT THE... THAT WAS MY SPECIAL ATTACK! HEY, YOU STUPID DOG, COME BACK WITH MY SPECIAL ATTACK BEFORE I MURDER YOU! ... NEVER MIND! I'LL JUST USE A SUPER-POWERFUL REGULAR ATTACK!"
"*SIGH* HERE, HAVE AN ABSOLUTELY NORMAL ATTACK..."
"WELL! IT'S CLEAR YOU CAN'T DEFEAT ME! IN FACT, I CAN SEE THAT YOU ARE SHAKING IN YOUR BOOTS! THEREFORE, I, THE GREAT PAPYRUS, WILL GRANT YOU PITY! I WILL SPARE YOU FOR THE TIME BEING, HUMAN! NOW IS YOUR CHANCE TO ACCEPT MY MERCY AND MOVE ON!"
"ALAS, POOR PAPYRUS! WELL, AT LEAST I STILL HAVE MY HEAD." [if killed]
"WELL, THAT'S NOT WHAT I EXPECTED TO HAPPEN! BUT I THINK THAT YOU CAN DO GREAT THINGS! I BELIEVE IN YOU!" [if killed in genocide route]
"WOWIE! YOU DID IT! YOU DIDN'T ATTACK ME! I MUST ADMIT, EVEN I WAS A LITTLE AFRAID! BUT I CAN SEE YOU ARE WELL ON YOUR WAY TO BECOMING A BETTER PERSON! I WAS SUPPOSED TO CAPTURE YOU, BUT... OH WELL! LET'S LET BYGONES BE BYGONES, OK?" [spare in genocide route]

(I have not included Undyne since her dialogue in Undertale is EXTREMELY similar to something an Underfell character would say)
Mettaton
Flavour Text*His metal body renders him invulnerable to attack. Don't even try it. [check, quiz show]
*Look, he's still invulnerable, OK? [check, dungeon]
*Stop checking! He won't stop being invulnerable! [check, CORE]
*While contestants are known to scream a lot, Mettaton doesn't appreciate it at the moment. [cry]
*Mettaton attacks! [encounter]
*Mettaton. [neutral]
*Smells like blood. [neutral]
*The quiz show continues. [neutral during quiz show]
*This is what you're going to do if a miracle doesn't happen soon. [burn]
*Seems like turning Mettaton around is the only way to progress... [after Alphys calls]
*You tell Mettaton that there's another human behind him. [turn]

Quotes"LET'S START WITH AN EASY ONE!" (what is the prize for answering correctly?)
(the quiz options and questions are all the same, but his responses are different)
  "RIGHT! SOUNDS TO ME LIKE YOU KNOW ALL THE RULES ALREADY!" [if answered correctly]
  "THAT'S THE WRONG ANSWER!" [if answered incorrectly]
"HERE'S YOUR TERRIFIC PRIZE!" (what is the king's full name?)
  "CORRECT! THAT'S HIS NAME!" [if answered correctly]
  "PERSONALLY, I THINK THAT NAME SUITS HIM... BUT IT'S STILL WRONG!" [if answered incorrectly]
"ENOUGH ABOUT YOU! LET'S TALK ABOUT ME!" (what are robots made out of?)
  "I GUESS THAT'S A REALLY EASY ONE!" [correct]
  "NOPE! HOW COULD YOU POSSIBLY NOT KNOW THE ANSWER!?" [incorrect]
"HERE'S ANOTHER EASY ONE FOR YOU!" (the trains question)
  "WONDERFUL MATHS SKILLS THERE, DARLING!" [correct]
  "WRONG!" [incorrect]
"BUT DON'T 'COUNT' ON YOUR VICTORY! HAHAHAHAHA!" (how many flies are in the jar?)
  "CORRECT! I GUESS YOU'RE PRETTY LUCKY!" [correct]
  "COMPLETELY AND UTTERLY... THE WRONG ANSWER! HAHAHA!" [incorrect]
"OK... LET'S PLAY MEMORY GAME!" (what monster is this?)
  "I'M SO FLATTERED YOU REMEMBERED!" [correct]
  "HOW COULD YOU POSSIBLY NOT RECOGNISE YOURS TRULY!?" [incorrect]
"THIS ONE'S PRETTY TOUGH..." (would you smooch a ghost?)
  "WOW~" [when answered]
"HERE'S A SIMPLE ONE..." (how many letters are in the name Mettaton?)
  "OF COURSE YOU CAN READ!" [correct]
  "YOU CAN'T READ? HOW EMBARRASSING!" [incorrect]
"TIME FOR ANOTHER TRICKY ONE!" (this question is about Happy Tree Friends, Alphys' favourite show)
"OH, ALPHYS. I DON'T THINK YOU'RE REALLY HELPING OUR CONTESTANT, ARE YOU? LUCKILY FOR YOU, I HAVE A QUESTION HERE YOU'LL MOST DEFINITELY KNOW THE ANSWER TO!!!" (who does Alphys have a crush on?)
  "SEE, ALPHYS? I TOLD YOU A HUNDRED TIMES, IT'S OBVIOUS. EVEN THIS CLEARLY BRAINDEAD HUMAN FIGURED IT OUT! YES, SHE SCRIBBLES HER NAME IN THE MARGINS OF HER NOTES, ACCOMPANIED BY LITTLE DOODLES. SHE WRITES STORIES ABOUT THEM MURDERING INNOCENT PEOPLE TOGETHER. PROBABILITY OF CRUSH? 101 PERCENT. MARGIN OF ERROR? WELL... I DON'T MAKE ERRORS, AS ALPHYS HERE WILL TELL YOU." [Undyne]
  "WHY WOULD SHE HAVE GIVEN ME A BODY THAT COULD BRUTALLY MURDER HUMANS? TO IMPRESS MR. ASGORE DREEMURR, OF COURSE! LIKE ALL THOSE WHO CREATE WEAPONS, SHE LONGS TO BE HIGHER UP IN SOCIETY... SO WHY NOT JUMP AT THE CHANCE TO IMPRESS THE KING HIMSELF?" [Asgore]
  "... SERIOUSLY? HOW CONCEITED CAN YOU GET? I LOVE IT! ... AHEM. WHILE YOU ARE COMPLETELY WRONG, YOU AT LEAST DESERVE SOME CREDIT. SHE WATCHES YOU ON HER COMPUTER SCREEN, TELLING YOU WHERE TO GO, CHEERING YOU ON... IF THIS ISN'T LOVE, I DON'T KNOW WHAT LOVE IS." [the human]
  "CORRECT. ALPHYS, DOES, IN FACT, HAVE A CRUSH ON... THE UNKNOWABLE. YOU SEE, SHE BELIEVES THAT THERE IS SOMEONE OUT THERE WHO IS WATCHING HER. SOMEONE SHE SAYS IS "CUTE" AND "INTERESTING!!" GREETINGS, THEORETICAL PERSON! MAY ALPHYS MEET YOU ONE DAY!" [don't know]
"WELL WELL WELL... WITH DR. ALPHYS HELPING YOU, THIS SHOW HAS NO DRAMATIC TENSION! WE CAN'T GO ON WITH SUCH LACK OF BRUTALITY! BUT. BUT! BUT!! THIS, MY DARLINGS, WAS JUST THE PILOT EPISODE! NEXT TIME, THERE WILL BE MORE BLOODSHED THAN YOU COULD EVER IMAGINE! UNTIL NEXT TIME!"
"YES, I WAS THE ONE THAT RE-ARRANGED THE CORE! I WAS THE ONE THAT HIRED ALL THESE MONSTERS TO KILL YOU! THAT, HOWEVER, WAS A SHORT-SIGHTED PLAN! DO YOU KNOW WHAT WOULD BE BETTER FOR ALL THOSE VIEWERS OUT THERE? KILLING YOU MYSELF! HAHAHAHAHA!"
"THAT WORTHLESS LITTLE PEA-SHOOTER YOU HAVE THERE WON'T WORK ON ME, DARLING. DON'T YOU UNDERSTAND WHAT ACTING IS?" [if he is shot]
"LISTEN. I'VE SEEN YOU FIGHT. YOU'RE A WEAKLING. IF YOU CONTINUE FORWARD, ASGORE WILL TAKE YOUR SOUL AND USE IT TO CROSS THE BARRIER! THEN, HE WILL DESTROY HUMANITY! BUT IF I GET YOUR SOUL INSTEAD, I'LL BE ABLE TO STOP HIS PLAN! I'LL CROSS THE BARRIER... AND WIPE OUT HUMANITY MYSELF! MY WAY! SO WHAT IF EVERYBODY HAS TO DIE? THAT'S ENTERTAINMENT! THAT'S WHAT MONSTERS WANT!"
[Alphys calls] Um... it's kind of a shame... but I can't see you two in there. You! Human! You better not give up... in fact, there's a way for every monster here to be VERY interested in tonight's show! It's, well, it's... I feel like I'll be judged when you see this... but have you noticed that Mettaton always faces forward? Probably not. Anyway, there's a switch on his back. Even an idiot like you could spot it. If you can somehow turn him around and press the switch... you're going to have an interesting, painful death. I have to go. Enjoy!"
"ANOTHER HUMAN? WHERE? BEHIND ME, YOU SAY? WOW, WOULDN'T IT BE AMAZING TO HAVE TWO GUESTS OF HONOUR!? HANG ON... WHERE IS THIS HUMAN? ARE THEY IN THE AUDIENCE... WAIT... THERE'S NO-"
"DID YOU. JUST FLIP. MY SWITCH!?" [after switch is pressed]

Mettaton EX
Flavour Text*Still has four arms. [check]
*Mettaton EX makes his premiere! [encounter]
*Mettaton. [neutral]
*Still smells like blood. [neutral]
*Smells like rotten flesh. [neutral after eating MTT-brand food]
*You would look to the audience for help, but they're rooting for your destruction! [neutral]
*You wonder how you're going to die. [neutral on the first few turns]
*Looks like you only have one arm to defend yourself with. [turn after the second heart attack]
*You have to run somewhere to escape this fate. [neutral after losing arm]
*Mettaton is saving your essay for future use. [after essay]
*You say you aren't going to get hit at ALL. Unfortunately, the audience wants nothing more than to see you die. [boast]
*You posed dramatically. The audience smirk. [pose]
*Despite being hurt, you posed dramatically. The audience laugh at your suffering. [pose with less than half HP]
*With the last of your power, you pose dramatically. The audience seems to really enjoy this! [pose at low HP or after the second half of the battle starts]
*You turn and scoff at the audience. Now they REALLY want you dead! [heel turn]
*You eat the (item). The audience seem very shocked, but cheer anyway. [eat anything MTT-brand] (Note: The MTT-brand food in Underfell is made with human flesh.)
*You eat the Face Steak. It doesn't really taste like steak... but the audience seems to love it! [eat the Steak in the Shape of Mettaton's Face]
*You eat the Junk Food. Bad idea. [eat Junk Food]
*You throw the stick. It hits an audience member. Everyone finds this very entertaining. [throw stick]
*You use the Mystery Key. Mettaton looks at it for a few moments before pretending it's not there. [use Mystery Key]

Quotes"Lights! Camera! Action!"
"Bloodshed! Lots of bloodshed!"
"Every monster here wishes they were me! Don't deny it!"
"Try and smile through the pain, darling~"
"Looks like it's time for a pop quiz. If you didn't bring a keyboard... well. This one's an essay question!"
  "... OK then. You get a gold star." [anything he doesn't recognise]
  "Sometimes the fewest words speak the loudest... I guess." [one to three words]
  "Speechless? Well, I guess there's a lot to love..." [nothing]
  "Sometimes people talk about my legs... but I have four arms, and I must admit that comes in handy. No pun intended." [arms, this awards you more points than legs]
  "My hair... if you're looking for how I do it, I use metal hair gel. I wouldn't recommend it for humans." [hair]
  "Toby? Who's that? He sounds like a human... I'll have to trick him into making an appearance 'live'!" [Toby]
  "They say my voice is as good as the screams that come from my most unfortunate contestants!" [voice]
  "Legs... well, I suppose it would be harder to catch you without them." [legs]
  "Seriously? You're just saying that so you can try and convince me not to rip you to shreds. Well, I'm afraid that won't work!" [any sort of word complementing appearance]
  "Too bad for you! You're about to die!" [I love you]
"You do know my only purpose is to kill humans, right?" [personality]
"This is a family friendly TV show, you hear? Stand still while I disembowel you!" [any swear word]
"This isn't about me, you selfish idiot!" [any sort of insulting word]
"Your essay showed everyone your heart! Before I rip yours out of your chest, I'll show you mine!"
"I'm just warming up! Wait until you see what I have in store next!"
"How's your experience with lasers? Were you even listening to Alphys?"
"Can you keep up the pace?"
"Lights! Camera! Bombs!"
"Things are blowing up! And you're one of them!"
"Unfortunately, we have to take a break from this wonderful brutality!"
"You don't seem to be enjoying yourself that much... how about we have another heart-to-heart?"
"You're still alive...? How is this possible? It doesn't matter! I'm still going to win!"
"Just die already!"
"The audience is getting bored!"
"Enough of this! Do you WANT humanity to perish or something?"
"Haha, how inspiring! You really ARE an idiot. Witness the true power of me, 'humanity's star'!"
"Hang on..."
"Are YOU the one who's going to save humanity from destruction?"
"Wow, look at these ratings! This is the most viewers I've ever had! 12,000... that's a lot of people! I believe we've reached the call-in milestone! Someone out there will be able to talk to me... before I leave the underground and destroy humanity! Let's see who calls in first! [ring] Hello! You're on TV! What do you have to say on this - our last underground show?"
"...... oh...... hi..... mettaton... i thought your show was pretty cool... my life is really boring.... nowadays.... but every time your show is on.... i suddenly get excited.... it's such a shame i can't leave the underground....... i'll miss you, mettaton...... oh.... i've been talking for ages.... bye.... [hangs up]
"NO! WAIT! BL... he... they... they already hung up. I guess I'll take another caller."
"That last episode was so exciting!"
"What are we gonna watch now?"
"There's a Mettaton-shaped hole in my Mettaton-shaped heart..."
"Oh... I see. Everyone here, thank you so much for watching. ... Darling. Perhaps it would be better if I stayed here. You're human... but you're not half bad. And I'm not just talking about flavour. You are a good person. Besides, monsters only have me to watch. Enough humans come down here for me to have as guests anyway. Sometimes I even bring in monsters.... ahem. I'm going to have to delay the destruction of humanity. You're very strong, anyway. You probably will be mashed up into an unrecognisable pulp after fighting Asgore, but that doesn't mean I don't believe you can do something. Everyone here, give a big hand for our wonderful contestant. They need one after losing their left arm. Goodbye darling! Stay fabulous!" [if ratings go above 12,000]
"So I was wrong. You're very strong indeed. Asgore will be terrified of you. It's time for you to go. And me? Don't worry about me. I'll just... get some upgrades. ... And even if I'm not supposed to be a star, I still got one last chance... at killing a human... So... thank you so much..." [if killed]

Asgore
Flavour Text*ASGORE attacks! [encounter]
*... [neutral]
*You quietly tell ASGORE that you don't want to fight him. He doesn't listen. [talk, if you haven't killed anyone]
*You tell ASGORE that you don't want to fight him, but he doesn't believe you. [talk]
*You firmly tell ASGORE to stop fighting. For a second, he is reminded of someone. ASGORE's DEFENCE dropped! [talk #2]
*Seems talking can't really help you out here. [talk #3+]
*All you can do is FIGHT. [talk #9]
*You eat the Butterscotch Pie. The smell reminded ASGORE of something... ASGORE's ATTACK down! ASGORE's DEFENCE DOWN! [eat the Butterscotch Pie]
*You tell ASGORE he's killed you (number of times) before. Unfortunately, this makes him want to kill you over and over. [talk if Asgore has killed you beforehand]
*Asgore has low HP. [low HP]

Quotes"I remember the day after my son, Asriel, committed suicide."
"The entire underground was devoid of hope."
"Once again, our future had been taken by the humans!"
"I declared war!"
"I said that every human who came down here would be destroyed! The ones with the most powerful SOULs would be kept her so I could gain great power!"
"Then I would destroy humanity."
"Monsters would rule the surface."
"Soon, the people's hopes returned."
"My wife... she became disgusted with my actions."
"She said humans were not that bad. Then she left."
"This is why I am going to take your SOUL, here and now!"

Flowey's Intervention"ASGORE is getting pretty tough to beat, huh?"
"Well, don't you worry!"
"I've been waiting to kill him for you!"
"After all, we've become best friends!"
"I'm helpful, I've been useful to you, I hopefully didn't get in your way, I can help you! I can!"
"Remember: (name), it's kill or be killed." [if monsters before Asgore were killed]
"You may not understand, but I warned you, it's kill or be killed." [if no-one was killed]

Sans (note: he is fought at the end of True Pacifist instead of Genocide, and while he does dodge attacks, he calls you out for sparing him instead. As such, he works like Toriel. Keep sparing him)
Flavour Text*Don't worry about this one. He can only deal 1 damage. [check]
*Can't keep dodging forever. Keep attacking. If you want. [check after attacking]
*Sans is going to have a great time. [encounter]
*You haven't done anything wrong... but it feels like you have. [neutral]
*Still feels like you've done something wrong. [neutral]
*Sans is letting you hit him. [after he asks you to hit him]
*The REAL battle finally begins.
*Why are you reading this? [neutral, second phase]
*Sans looks kind of tired. [neutral, second phase]
*Sans is preparing something. [neutral after he talks about his special attack]

Quotes"it's a beautiful day outside, huh? birds are singing, flowers are blooming. on days like these, kids like you..."
"Shouldn't be trying to change who people are!" [after first attack]
"huh. always wondered why people never use their strongest attack first." [after opening attack is survived]
"as i was saying, it's a nice day out. why not go out with your friends?" [after surviving the opening attack twice]
"ready?" [if the opening attack has been survived twice]
"here we go again." [if the opening attack has been survived 3+ times]
"what? fighting. no thanks. while i appreciate you're turning around, i don't fancy dying." [attack]
"our reports showed a massive anomaly in the timespace continuum. timelines jumping left and right, stopping and starting." [spare #1]
"until suddenly they just stop. it's really weird." [spare #2]
"it's probably your fault. you've got powers like that." [spare #3]
"i'm probably wrong though. i usually am." [spare #4]
"hopefully this one will reset. bring things back to the way they once were." [spare #5]
"look. i don't want any of my friends to change. i don't want what i watch on tv to change." [spare #6]
"i don't really care about destroying humanity, either." [spare #7]
"even if humanity is destroyed we could be reset. right back here." [spare #8]
"it makes it hard for me to give it my all, y'know?" [spare #9]
"or maybe that's just me." [spare #10]
"but i can't afford to not care anymore." [spare #11]
"that being said, it looks like you like waving around your weapon, huh?"
"hey, how about i let you hit me for once? some part of you doesn't really like me that much. there's a memory of someone there... who wasn't really my best friend. they wanted to kill me. c'mon, buddy, i know it's really you! just listen to me!" [normal spare dialogue]
"fighting... is pretty exciting, right? let's make it fair..." [spare dialogue if Sans has already been attacked after this turn]
"? finally. buddy. pal. i know how hard it must be, going back on your pacifism..." [attack]
(he then dodges) "geeetttttt dunked on! as if i'd let you attack me!"
"welp, it was worth a shot. guess we'll have to do things the hard way." [spare #12]
"wow. you look sort of annoyed at me. i'm real good at pranks, huh? i wonder if any of the other sans-es are." [if Sans was attacked on the previous turn before]
"this sounds strange, but i was sorta hoping i'd end up being your only friend. i always thought the anomaly kept resetting because they were unhappy with their result. so maybe they wanna be lonely." [spare #13]
"well, it's about time they get what they want, huh? i won't be your friend." [spare #14}
"but that's ridiculous. you're the type of person who's gonna keep on resetting. you've gotta know when to QUIT." [spare #15]
"when should you quit? about now." [spare #16]
"all this fighting... it's really tiring me out." [spare #17]
"if you keep on doing this, i'll have to show you my special attack." [spare #18]
"yeah. i have a special attack. just like papyrus. if you don't want to see it, you should die now." [spare #19]
"well, here goes nothing. survive THIS and i'll show you my special attack!" [spare #20]
"alright... you asked for it. prepare... for my special attack!" [spare #21]
"yep. it's nothing. that's my special attack. nothing's gonna happen. see, it's my turn now. and nothing's happening. you just keep on sparing me. so i've decided to make my turn last forever. so you won't be able to spare me again." (Sans eventually falls asleep)
(At this point, he can be spared, in which case you will just leave him and move on, or killed.)
"huh. so you took the chance... to actually attack me. you traitor..." [if killed]

Asriel Dreemurr (is the boss of the Genocide Route)
Flavour Text*Legendary being made of hopes and dreams. [check]
*The Absolute GOD of Determination! [check after transformation]
*It's the end. [neutral before transformation]
*Asriel charges/calls on/readies (attack name). [neutral]
*You think about why you're here now... you can feel the empty space in your inventory get smaller! [dream]
*Your inventory filled up with dreams. [dream #2+]
*You hold on to your hopes. You reduced how much DAMAGE you'll take this turn! [hope]
*You kept holding on. DAMAGE reduced! [hope #2+]
*ASRIEL blocks the way! [encounter]
*Asriel hopes to stop you from ending the world. [neutral]
*Can't move your body. [struggle #1-4]
*Can't move your body. Nothing happened. You tried to reach your SAVE file. Nothing happened. You tried again. Nothing happened. It's impossible. Just give up already. [struggle #5]
*!?!? [after all buttons disappear except MERCY and FIGHT]
*You reached out to Asriel's SOUL. It's the only one left now. You try your hardest to break it in two. But nothing happened. [attack]
*You tried your best to break Asriel's SOUL. But it failed. [attack #2+]
*You feel your own SOUL resonating! [after attacking twice]
*Your SOUL is strongly resonating! Asriel looks terrified... [after attacking five times]
*Strangely, now you felt stronger. Like you could do anything. DETERMINATION. You were finally able to push apart ASRIEL's SOUL! [attack #6]

Quotes"You know... I don't care about you anymore."
"After I defeat you and gain control over the timeline... I just want to reset everything."
"Everyone will finally be happy again."
"Then we can try this again."
"But you don't want that, do you?"
"You just want to see everyone dead."
"That sickens me."
"It really does."
"Because, for some reason, you chose to make everyone's lives a misery."
"But I won't let you do that."
"I came on your journey because I wanted to help you. Become your best friend."
"But seeing you kill everyone... it was really disturbing."
"ENOUGH messing around! Time to eradicate you!"
"... even after THAT, you're still standing there in my way?"
"NO! I won't let this world down! Behold my true power!"
"Every time you die... your grip on this world slips a little. You're a little more discouraged every time."
"No! NO! You can't do this to me! (name), I trusted you! (name), did I really do anything wrong? I just wanted to be your friend... (name)... [killed]

Description
body div#devskin0 hr { }

Since it's hard to talk about Undertale without spoiling it, it's safe to say there are spoilers in this. Be warned!

Napstablook
Flavour Text*Like all monsters, they don't seem to have a sense of humour... [check]
*Missed the memo and is the same difficulty as normal. [check in hard mode]
*Napstablook is here. [encounter]
*Napstablook is here. Again. [encounter in hard mode]
*Napstablook is acting aloof. [neutral]
*Napstablook is staring at you, trying to be intimidating. [neutral]
*Napstablook looks bored. [neutral]
*They don't smell very nice. [neutral]
*You try and smile at Napstablook. [cheer]
*Napstablook looks more confused than mad. [turn after cheer]
*You were going to tell a joke, but remember Napstablook has no sense of humour. You decide to pull a practical joke on Flowey instead. [cheer #2]
*Flowey looks very annoyed... but Napstablook is smiling! [turn after cheer #2]
*Napstablook wants to show you something. [cheer #3]
*Napstablook wants to know what you think. [turn after cheer #3]
*You look at Napstablook the same way they are looking at you. [threat]

Quotes"hey! i am REALLY funny!" [check]
"nnnnnnggghhh." [neutral]
"just pluggin along..." [neutral]
"leave me alone." [neutral]
"are you serious?" [flirt]
"go ahead. i'm not afraid." [threat]
"go away." [cheer]
"seriously, go away!" [cheer #2]
"fine. i'll show you something cool. i call it 'dapper blook'. you'd better like it."
"heh, thought so." [any other action than cheer or flirt after showing dapper blook]
"oh... no..." [flirt after dapper blook]
"fine..." [cheer after dapper blook]

Toriel
Flavour Text*Knows best for you...? [check]
*TORIEL blocks the way! [encounter]
*Toriel looks at you strangely. [neutral]
*Toriel prepares a magical attack. [neutral]
*Toriel laughs evilly. [neutral]
*... [when she stops attacking]
*You couldn't think of any topics you'd be comfortable discussing. [talk]
*All you can think about is ways to mash up snails. [talk #2]
*Talking about mashing up snails probably won't resolve this... [talk #3+]
*You thought about telling Toriel you saw her die. | But she'll probably go through with it if you tell her. [talk if you've killed her before]
*You can't show mercy without fighting or running away. [talk #2 if you've killed her before]
*Not really worth talking to. [genocide route]

Quotes"...." [spare]
".... ...." [spare #2]
".... .... ...." [spare #3]
"...?" [spare #4]
"Stop!" [spare #5]
"Just fight me!" [spare #6]
"You're not proving anything by doing this!" [spare #7]
"Attack me or go back!" [spare #8]
"STOP IT!" [spare #9]
"Don't look at me like that! You know what I want!" [spare #10]
"..." [spare #11]
"... ..." [spare #12]
"I know you want to leave this place, but..." [spare #13]
"But just go upstairs!" [spare #14]
"I'll try not to kill you, promise!" [spare #15]
"I know you're scared of me, but..." [spare #16]
"I want to be a better person." [spare #17]
"Why are you making this so hard for me?" [spare #18]
"Go upstairs! I promise we'll have good lives!" [spare #19]
"..." [spare #20]
"Ha ha..." [spare #21]
"Pathetic, is it not? No child has ever believed me. You are no different, are you? You wouldn't give me a chance." [spare #21]
"..." [spare #23]
"... I understand. You wouldn't be happy trapped down here with someone like me. The Ruins are not right for humans to live in. My second chance, my fear... for you, my child... I will put them aside." [spare #24]
"Urgh... you are stonger than I thought... listen to me, small one... if you go beyond this door... keep walking east for as long as you can... you'll eventually reach an exit. ... .... ASGORE. Do not let ASGORE take your soul! His plan can't be allowed to succeed anymore! Be good, alright? My... child... [killed, neutral route]
"You... at my most vulnerable moment... to think that I was worried you wouldn't fit in with the monsters out there! You are no different to them! Eheheheheh!" [killed after she stops attacking]
"Y... you... really hate me that much...? Now I see who I was really protecting by trapping you here! Not you... but them! Eheheheheh!" [killed, genocide route]

Papyrus
Flavour Text*He likes to say "NYAH HAH HAH!" [check]
*Forgettable. [check on genocide route]
*Papyrus blocks the way! [encounter]
*You're blue now. [after Papyrus' blue attack]
*Papyrus is acting tough. [neutral]
*Papyrus whispers "Nyah hah hah!" [neutral]
*Papyrus is preparing a bone attack. [neutral]
*Papyrus is cackling. [neutral]
*Papyrus prepares a non-bone attack... but they won't kill you. He fixes his mistake. [neutral]
*Papyrus is rattling his bones, so to speak. [neutral]
*Smells like despair. [neutral]
*Papyrus thinks about what Sans might be doing and is frowning. [neutral]
*Papyrus is thinking about what to wear for his date. [if flirted with]
*Papyrus is thinking about what to cook for his date. [if flirted with]
*Papyrus dabs some Bone Cologne behind his ear. [if flirted with]
*Papyrus dabs some blood behind his ear. [if flirted with]
*Papyrus realises he doesn't have ears. [if flirted with]
*You INSULT, but to no avail. Seems ACTing won't have any effect. [insult after blue attack]
*You FLIRT, but to no avail. Seems ACTing won't have any effect. [flirt after blue attack]
*You throw the stick. Papyrus catches it and snaps it. [using stick]
*Papyrus is preparing a regular attack. [after he tries to use his special attack]
*Papyrus is sparing you... for now. [after his "completely normal attack"/genocide]

Quotes"WHAT!? FLIRTING!? SO YOU FINALLY REVEAL YOUR ULTIMATE FEELINGS! TOO BAD FOR YOU! I'M A SKELETON WITH VERY HIGH STANDARDS!" [flirt]
"OH NO!!! YOU'RE MEETING ALL MY STANDARDS!!!" [I can make traps]
"OH NO!!! THAT SELF-LOATHING... IT REMINDS ME OF... SANS! YOU'RE MEETING ALL MY STANDARDS!!! [I have zero redeeming qualities]
"I GUESS THIS MEANS I HAVE TO GO ON A DATE OF SORTS WITH YOU LATER!! AFTER I KILL YOU!" [flirt]
"STOP! WE'LL DATE LATER! WHEN YOU'RE DEAD!" [flirt #2]
"I SAID WE'LL DATE LATER!" [flirt #3+]
"HOW SELFISH... YOU WANT MY FIGHT TO LAST LONGER, HUH!? SO YOU'LL BE ABLE TO KEEP ME FIGHTING YOU WHEN I'VE GOT BETTER TO DO!?" [insult]
"STOP INSULTING ME! YOU'RE MAKING ME REALLY MAD!" [insult #2]
"HOW DARE YOU WASTE YOUR WORDS ON ME?" [insult #3]
"DON'T WASTE YOUR SCREAMS!" [insult #4+]
"SO YOU'RE SERIOUS..." [fight]
"SO YOU WON'T FIGHT, HUH? GUESS WE'LL HAVE TO DO THIS THE HARD WAY!" [spare]
"I BET YOU CAN'T HANDLE MY FABLED BLUE ATTACK!"
"YOU'RE BLUE NOW. THAT'S MY ATTACK! NYAH HAH HAH HAH HAH HAH HAH HAH HAH!"
"BEHOLD!" [if not flirted with or hit by the blue attack]
"HMM... I WONDER WHAT I SHOULD WEAR..." [if flirted with]
"WHAT? A DATE? HMPH. I'M NOT THINKING ABOUT THAT AT THE MOMENT." [if flirted with]
"TRY HOLDING THE UP BUTTON TO JUMP! OR NOT! IT DOESN'T REALLY MATTER!" [if hit on the first blue attack]
"HOW HIGH IS IT POSSIBLE FOR HUMANS TO JUMP!?" [if hit by both blue attacks]
"FOR CRYING OUT LOUD! HOLD UP LONGER TO JUMP HIGHER!!!" [if hit by blue attacks continually]
"DON'T MAKE ME USE MY SPECIAL ATTACK!"
"I CAN ALMOST TASTE MY FUTURE POPULARITY!"
"PAPYRUS: HEAD OF THE ROYAL GUARD!"
"PAPYRUS: UNPARALLELED SPAGHETTORE!"
"UNDYNE WILL BE REALLY PROUD OF ME!"
"THE KING WILL TRIM A VERY DANGEROUS AND COOL-LOOKING HEDGE IN THE SHAPE OF MY SMILE!"
"SANS WILL... WELL, HE WILL TREMBLE IN HIS SLIPPERS!"
"I'LL HAVE LOTS OF ADMIRERS! BUT HOW WILL I KNOW IF PEOPLE SECRETLY LIKE ME?"
"SOMEONE LIKE YOU IS REALLY RARE. I'M SURE THEY'LL HAVE FUN MAKING YOU INTO A BURGER! NYEH HEH HEH!"
"THAT'S NOT UNTIL I'VE KILLED YOU, THOUGH!"
"BUT WHO CARES? GIVE UP!"
"GIVE UP OR FACE MY SPECIAL ATTACK!"
"VERY SOON I WILL USE MY SPECIAL ATTACK!"
"JUST A MINUTE BEFORE I UNLEASH MY SPECIAL ATTACK!"
"THIS IS YOUR LAST CHANCE... BEFORE I USE MY SPECIAL ATTACK!"
"BEHOLD...! MY SPECIAL ATTACK!"
"WHAT THE... THAT WAS MY SPECIAL ATTACK! HEY, YOU STUPID DOG, COME BACK WITH MY SPECIAL ATTACK BEFORE I MURDER YOU! ... NEVER MIND! I'LL JUST USE A SUPER-POWERFUL REGULAR ATTACK!"
"*SIGH* HERE, HAVE AN ABSOLUTELY NORMAL ATTACK..."
"WELL! IT'S CLEAR YOU CAN'T DEFEAT ME! IN FACT, I CAN SEE THAT YOU ARE SHAKING IN YOUR BOOTS! THEREFORE, I, THE GREAT PAPYRUS, WILL GRANT YOU PITY! I WILL SPARE YOU FOR THE TIME BEING, HUMAN! NOW IS YOUR CHANCE TO ACCEPT MY MERCY AND MOVE ON!"
"ALAS, POOR PAPYRUS! WELL, AT LEAST I STILL HAVE MY HEAD." [if killed]
"WELL, THAT'S NOT WHAT I EXPECTED TO HAPPEN! BUT I THINK THAT YOU CAN DO GREAT THINGS! I BELIEVE IN YOU!" [if killed in genocide route]
"WOWIE! YOU DID IT! YOU DIDN'T ATTACK ME! I MUST ADMIT, EVEN I WAS A LITTLE AFRAID! BUT I CAN SEE YOU ARE WELL ON YOUR WAY TO BECOMING A BETTER PERSON! I WAS SUPPOSED TO CAPTURE YOU, BUT... OH WELL! LET'S LET BYGONES BE BYGONES, OK?" [spare in genocide route]

(I have not included Undyne since her dialogue in Undertale is EXTREMELY similar to something an Underfell character would say)
Mettaton
Flavour Text*His metal body renders him invulnerable to attack. Don't even try it. [check, quiz show]
*Look, he's still invulnerable, OK? [check, dungeon]
*Stop checking! He won't stop being invulnerable! [check, CORE]
*While contestants are known to scream a lot, Mettaton doesn't appreciate it at the moment. [cry]
*Mettaton attacks! [encounter]
*Mettaton. [neutral]
*Smells like blood. [neutral]
*The quiz show continues. [neutral during quiz show]
*This is what you're going to do if a miracle doesn't happen soon. [burn]
*Seems like turning Mettaton around is the only way to progress... [after Alphys calls]
*You tell Mettaton that there's another human behind him. [turn]

Quotes"LET'S START WITH AN EASY ONE!" (what is the prize for answering correctly?)
(the quiz options and questions are all the same, but his responses are different)
  "RIGHT! SOUNDS TO ME LIKE YOU KNOW ALL THE RULES ALREADY!" [if answered correctly]
  "THAT'S THE WRONG ANSWER!" [if answered incorrectly]
"HERE'S YOUR TERRIFIC PRIZE!" (what is the king's full name?)
  "CORRECT! THAT'S HIS NAME!" [if answered correctly]
  "PERSONALLY, I THINK THAT NAME SUITS HIM... BUT IT'S STILL WRONG!" [if answered incorrectly]
"ENOUGH ABOUT YOU! LET'S TALK ABOUT ME!" (what are robots made out of?)
  "I GUESS THAT'S A REALLY EASY ONE!" [correct]
  "NOPE! HOW COULD YOU POSSIBLY NOT KNOW THE ANSWER!?" [incorrect]
"HERE'S ANOTHER EASY ONE FOR YOU!" (the trains question)
  "WONDERFUL MATHS SKILLS THERE, DARLING!" [correct]
  "WRONG!" [incorrect]
"BUT DON'T 'COUNT' ON YOUR VICTORY! HAHAHAHAHA!" (how many flies are in the jar?)
  "CORRECT! I GUESS YOU'RE PRETTY LUCKY!" [correct]
  "COMPLETELY AND UTTERLY... THE WRONG ANSWER! HAHAHA!" [incorrect]
"OK... LET'S PLAY MEMORY GAME!" (what monster is this?)
  "I'M SO FLATTERED YOU REMEMBERED!" [correct]
  "HOW COULD YOU POSSIBLY NOT RECOGNISE YOURS TRULY!?" [incorrect]
"THIS ONE'S PRETTY TOUGH..." (would you smooch a ghost?)
  "WOW~" [when answered]
"HERE'S A SIMPLE ONE..." (how many letters are in the name Mettaton?)
  "OF COURSE YOU CAN READ!" [correct]
  "YOU CAN'T READ? HOW EMBARRASSING!" [incorrect]
"TIME FOR ANOTHER TRICKY ONE!" (this question is about Happy Tree Friends, Alphys' favourite show)
"OH, ALPHYS. I DON'T THINK YOU'RE REALLY HELPING OUR CONTESTANT, ARE YOU? LUCKILY FOR YOU, I HAVE A QUESTION HERE YOU'LL MOST DEFINITELY KNOW THE ANSWER TO!!!" (who does Alphys have a crush on?)
  "SEE, ALPHYS? I TOLD YOU A HUNDRED TIMES, IT'S OBVIOUS. EVEN THIS CLEARLY BRAINDEAD HUMAN FIGURED IT OUT! YES, SHE SCRIBBLES HER NAME IN THE MARGINS OF HER NOTES, ACCOMPANIED BY LITTLE DOODLES. SHE WRITES STORIES ABOUT THEM MURDERING INNOCENT PEOPLE TOGETHER. PROBABILITY OF CRUSH? 101 PERCENT. MARGIN OF ERROR? WELL... I DON'T MAKE ERRORS, AS ALPHYS HERE WILL TELL YOU." [Undyne]
  "WHY WOULD SHE HAVE GIVEN ME A BODY THAT COULD BRUTALLY MURDER HUMANS? TO IMPRESS MR. ASGORE DREEMURR, OF COURSE! LIKE ALL THOSE WHO CREATE WEAPONS, SHE LONGS TO BE HIGHER UP IN SOCIETY... SO WHY NOT JUMP AT THE CHANCE TO IMPRESS THE KING HIMSELF?" [Asgore]
  "... SERIOUSLY? HOW CONCEITED CAN YOU GET? I LOVE IT! ... AHEM. WHILE YOU ARE COMPLETELY WRONG, YOU AT LEAST DESERVE SOME CREDIT. SHE WATCHES YOU ON HER COMPUTER SCREEN, TELLING YOU WHERE TO GO, CHEERING YOU ON... IF THIS ISN'T LOVE, I DON'T KNOW WHAT LOVE IS." [the human]
  "CORRECT. ALPHYS, DOES, IN FACT, HAVE A CRUSH ON... THE UNKNOWABLE. YOU SEE, SHE BELIEVES THAT THERE IS SOMEONE OUT THERE WHO IS WATCHING HER. SOMEONE SHE SAYS IS "CUTE" AND "INTERESTING!!" GREETINGS, THEORETICAL PERSON! MAY ALPHYS MEET YOU ONE DAY!" [don't know]
"WELL WELL WELL... WITH DR. ALPHYS HELPING YOU, THIS SHOW HAS NO DRAMATIC TENSION! WE CAN'T GO ON WITH SUCH LACK OF BRUTALITY! BUT. BUT! BUT!! THIS, MY DARLINGS, WAS JUST THE PILOT EPISODE! NEXT TIME, THERE WILL BE MORE BLOODSHED THAN YOU COULD EVER IMAGINE! UNTIL NEXT TIME!"
"YES, I WAS THE ONE THAT RE-ARRANGED THE CORE! I WAS THE ONE THAT HIRED ALL THESE MONSTERS TO KILL YOU! THAT, HOWEVER, WAS A SHORT-SIGHTED PLAN! DO YOU KNOW WHAT WOULD BE BETTER FOR ALL THOSE VIEWERS OUT THERE? KILLING YOU MYSELF! HAHAHAHAHA!"
"THAT WORTHLESS LITTLE PEA-SHOOTER YOU HAVE THERE WON'T WORK ON ME, DARLING. DON'T YOU UNDERSTAND WHAT ACTING IS?" [if he is shot]
"LISTEN. I'VE SEEN YOU FIGHT. YOU'RE A WEAKLING. IF YOU CONTINUE FORWARD, ASGORE WILL TAKE YOUR SOUL AND USE IT TO CROSS THE BARRIER! THEN, HE WILL DESTROY HUMANITY! BUT IF I GET YOUR SOUL INSTEAD, I'LL BE ABLE TO STOP HIS PLAN! I'LL CROSS THE BARRIER... AND WIPE OUT HUMANITY MYSELF! MY WAY! SO WHAT IF EVERYBODY HAS TO DIE? THAT'S ENTERTAINMENT! THAT'S WHAT MONSTERS WANT!"
[Alphys calls] Um... it's kind of a shame... but I can't see you two in there. You! Human! You better not give up... in fact, there's a way for every monster here to be VERY interested in tonight's show! It's, well, it's... I feel like I'll be judged when you see this... but have you noticed that Mettaton always faces forward? Probably not. Anyway, there's a switch on his back. Even an idiot like you could spot it. If you can somehow turn him around and press the switch... you're going to have an interesting, painful death. I have to go. Enjoy!"
"ANOTHER HUMAN? WHERE? BEHIND ME, YOU SAY? WOW, WOULDN'T IT BE AMAZING TO HAVE TWO GUESTS OF HONOUR!? HANG ON... WHERE IS THIS HUMAN? ARE THEY IN THE AUDIENCE... WAIT... THERE'S NO-"
"DID YOU. JUST FLIP. MY SWITCH!?" [after switch is pressed]

Mettaton EX
Flavour Text*Still has four arms. [check]
*Mettaton EX makes his premiere! [encounter]
*Mettaton. [neutral]
*Still smells like blood. [neutral]
*Smells like rotten flesh. [neutral after eating MTT-brand food]
*You would look to the audience for help, but they're rooting for your destruction! [neutral]
*You wonder how you're going to die. [neutral on the first few turns]
*Looks like you only have one arm to defend yourself with. [turn after the second heart attack]
*You have to run somewhere to escape this fate. [neutral after losing arm]
*Mettaton is saving your essay for future use. [after essay]
*You say you aren't going to get hit at ALL. Unfortunately, the audience wants nothing more than to see you die. [boast]
*You posed dramatically. The audience smirk. [pose]
*Despite being hurt, you posed dramatically. The audience laugh at your suffering. [pose with less than half HP]
*With the last of your power, you pose dramatically. The audience seems to really enjoy this! [pose at low HP or after the second half of the battle starts]
*You turn and scoff at the audience. Now they REALLY want you dead! [heel turn]
*You eat the (item). The audience seem very shocked, but cheer anyway. [eat anything MTT-brand] (Note: The MTT-brand food in Underfell is made with human flesh.)
*You eat the Face Steak. It doesn't really taste like steak... but the audience seems to love it! [eat the Steak in the Shape of Mettaton's Face]
*You eat the Junk Food. Bad idea. [eat Junk Food]
*You throw the stick. It hits an audience member. Everyone finds this very entertaining. [throw stick]
*You use the Mystery Key. Mettaton looks at it for a few moments before pretending it's not there. [use Mystery Key]

Quotes"Lights! Camera! Action!"
"Bloodshed! Lots of bloodshed!"
"Every monster here wishes they were me! Don't deny it!"
"Try and smile through the pain, darling~"
"Looks like it's time for a pop quiz. If you didn't bring a keyboard... well. This one's an essay question!"
  "... OK then. You get a gold star." [anything he doesn't recognise]
  "Sometimes the fewest words speak the loudest... I guess." [one to three words]
  "Speechless? Well, I guess there's a lot to love..." [nothing]
  "Sometimes people talk about my legs... but I have four arms, and I must admit that comes in handy. No pun intended." [arms, this awards you more points than legs]
  "My hair... if you're looking for how I do it, I use metal hair gel. I wouldn't recommend it for humans." [hair]
  "Toby? Who's that? He sounds like a human... I'll have to trick him into making an appearance 'live'!" [Toby]
  "They say my voice is as good as the screams that come from my most unfortunate contestants!" [voice]
  "Legs... well, I suppose it would be harder to catch you without them." [legs]
  "Seriously? You're just saying that so you can try and convince me not to rip you to shreds. Well, I'm afraid that won't work!" [any sort of word complementing appearance]
  "Too bad for you! You're about to die!" [I love you]
"You do know my only purpose is to kill humans, right?" [personality]
"This is a family friendly TV show, you hear? Stand still while I disembowel you!" [any swear word]
"This isn't about me, you selfish idiot!" [any sort of insulting word]
"Your essay showed everyone your heart! Before I rip yours out of your chest, I'll show you mine!"
"I'm just warming up! Wait until you see what I have in store next!"
"How's your experience with lasers? Were you even listening to Alphys?"
"Can you keep up the pace?"
"Lights! Camera! Bombs!"
"Things are blowing up! And you're one of them!"
"Unfortunately, we have to take a break from this wonderful brutality!"
"You don't seem to be enjoying yourself that much... how about we have another heart-to-heart?"
"You're still alive...? How is this possible? It doesn't matter! I'm still going to win!"
"Just die already!"
"The audience is getting bored!"
"Enough of this! Do you WANT humanity to perish or something?"
"Haha, how inspiring! You really ARE an idiot. Witness the true power of me, 'humanity's star'!"
"Hang on..."
"Are YOU the one who's going to save humanity from destruction?"
"Wow, look at these ratings! This is the most viewers I've ever had! 12,000... that's a lot of people! I believe we've reached the call-in milestone! Someone out there will be able to talk to me... before I leave the underground and destroy humanity! Let's see who calls in first! [ring] Hello! You're on TV! What do you have to say on this - our last underground show?"
"...... oh...... hi..... mettaton... i thought your show was pretty cool... my life is really boring.... nowadays.... but every time your show is on.... i suddenly get excited.... it's such a shame i can't leave the underground....... i'll miss you, mettaton...... oh.... i've been talking for ages.... bye.... [hangs up]
"NO! WAIT! BL... he... they... they already hung up. I guess I'll take another caller."
"That last episode was so exciting!"
"What are we gonna watch now?"
"There's a Mettaton-shaped hole in my Mettaton-shaped heart..."
"Oh... I see. Everyone here, thank you so much for watching. ... Darling. Perhaps it would be better if I stayed here. You're human... but you're not half bad. And I'm not just talking about flavour. You are a good person. Besides, monsters only have me to watch. Enough humans come down here for me to have as guests anyway. Sometimes I even bring in monsters.... ahem. I'm going to have to delay the destruction of humanity. You're very strong, anyway. You probably will be mashed up into an unrecognisable pulp after fighting Asgore, but that doesn't mean I don't believe you can do something. Everyone here, give a big hand for our wonderful contestant. They need one after losing their left arm. Goodbye darling! Stay fabulous!" [if ratings go above 12,000]
"So I was wrong. You're very strong indeed. Asgore will be terrified of you. It's time for you to go. And me? Don't worry about me. I'll just... get some upgrades. ... And even if I'm not supposed to be a star, I still got one last chance... at killing a human... So... thank you so much..." [if killed]

Asgore
Flavour Text*ASGORE attacks! [encounter]
*... [neutral]
*You quietly tell ASGORE that you don't want to fight him. He doesn't listen. [talk, if you haven't killed anyone]
*You tell ASGORE that you don't want to fight him, but he doesn't believe you. [talk]
*You firmly tell ASGORE to stop fighting. For a second, he is reminded of someone. ASGORE's DEFENCE dropped! [talk #2]
*Seems talking can't really help you out here. [talk #3+]
*All you can do is FIGHT. [talk #9]
*You eat the Butterscotch Pie. The smell reminded ASGORE of something... ASGORE's ATTACK down! ASGORE's DEFENCE DOWN! [eat the Butterscotch Pie]
*You tell ASGORE he's killed you (number of times) before. Unfortunately, this makes him want to kill you over and over. [talk if Asgore has killed you beforehand]
*Asgore has low HP. [low HP]

Quotes"I remember the day after my son, Asriel, committed suicide."
"The entire underground was devoid of hope."
"Once again, our future had been taken by the humans!"
"I declared war!"
"I said that every human who came down here would be destroyed! The ones with the most powerful SOULs would be kept her so I could gain great power!"
"Then I would destroy humanity."
"Monsters would rule the surface."
"Soon, the people's hopes returned."
"My wife... she became disgusted with my actions."
"She said humans were not that bad. Then she left."
"This is why I am going to take your SOUL, here and now!"

Flowey's Intervention"ASGORE is getting pretty tough to beat, huh?"
"Well, don't you worry!"
"I've been waiting to kill him for you!"
"After all, we've become best friends!"
"I'm helpful, I've been useful to you, I hopefully didn't get in your way, I can help you! I can!"
"Remember: (name), it's kill or be killed." [if monsters before Asgore were killed]
"You may not understand, but I warned you, it's kill or be killed." [if no-one was killed]

Sans (note: he is fought at the end of True Pacifist instead of Genocide, and while he does dodge attacks, he calls you out for sparing him instead. As such, he works like Toriel. Keep sparing him)
Flavour Text*Don't worry about this one. He can only deal 1 damage. [check]
*Can't keep dodging forever. Keep attacking. If you want. [check after attacking]
*Sans is going to have a great time. [encounter]
*You haven't done anything wrong... but it feels like you have. [neutral]
*Still feels like you've done something wrong. [neutral]
*Sans is letting you hit him. [after he asks you to hit him]
*The REAL battle finally begins.
*Why are you reading this? [neutral, second phase]
*Sans looks kind of tired. [neutral, second phase]
*Sans is preparing something. [neutral after he talks about his special attack]

Quotes"it's a beautiful day outside, huh? birds are singing, flowers are blooming. on days like these, kids like you..."
"Shouldn't be trying to change who people are!" [after first attack]
"huh. always wondered why people never use their strongest attack first." [after opening attack is survived]
"as i was saying, it's a nice day out. why not go out with your friends?" [after surviving the opening attack twice]
"ready?" [if the opening attack has been survived twice]
"here we go again." [if the opening attack has been survived 3+ times]
"what? fighting. no thanks. while i appreciate you're turning around, i don't fancy dying." [attack]
"our reports showed a massive anomaly in the timespace continuum. timelines jumping left and right, stopping and starting." [spare #1]
"until suddenly they just stop. it's really weird." [spare #2]
"it's probably your fault. you've got powers like that." [spare #3]
"i'm probably wrong though. i usually am." [spare #4]
"hopefully this one will reset. bring things back to the way they once were." [spare #5]
"look. i don't want any of my friends to change. i don't want what i watch on tv to change." [spare #6]
"i don't really care about destroying humanity, either." [spare #7]
"even if humanity is destroyed we could be reset. right back here." [spare #8]
"it makes it hard for me to give it my all, y'know?" [spare #9]
"or maybe that's just me." [spare #10]
"but i can't afford to not care anymore." [spare #11]
"that being said, it looks like you like waving around your weapon, huh?"
"hey, how about i let you hit me for once? some part of you doesn't really like me that much. there's a memory of someone there... who wasn't really my best friend. they wanted to kill me. c'mon, buddy, i know it's really you! just listen to me!" [normal spare dialogue]
"fighting... is pretty exciting, right? let's make it fair..." [spare dialogue if Sans has already been attacked after this turn]
"? finally. buddy. pal. i know how hard it must be, going back on your pacifism..." [attack]
(he then dodges) "geeetttttt dunked on! as if i'd let you attack me!"
"welp, it was worth a shot. guess we'll have to do things the hard way." [spare #12]
"wow. you look sort of annoyed at me. i'm real good at pranks, huh? i wonder if any of the other sans-es are." [if Sans was attacked on the previous turn before]
"this sounds strange, but i was sorta hoping i'd end up being your only friend. i always thought the anomaly kept resetting because they were unhappy with their result. so maybe they wanna be lonely." [spare #13]
"well, it's about time they get what they want, huh? i won't be your friend." [spare #14}
"but that's ridiculous. you're the type of person who's gonna keep on resetting. you've gotta know when to QUIT." [spare #15]
"when should you quit? about now." [spare #16]
"all this fighting... it's really tiring me out." [spare #17]
"if you keep on doing this, i'll have to show you my special attack." [spare #18]
"yeah. i have a special attack. just like papyrus. if you don't want to see it, you should die now." [spare #19]
"well, here goes nothing. survive THIS and i'll show you my special attack!" [spare #20]
"alright... you asked for it. prepare... for my special attack!" [spare #21]
"yep. it's nothing. that's my special attack. nothing's gonna happen. see, it's my turn now. and nothing's happening. you just keep on sparing me. so i've decided to make my turn last forever. so you won't be able to spare me again." (Sans eventually falls asleep)
(At this point, he can be spared, in which case you will just leave him and move on, or killed.)
"huh. so you took the chance... to actually attack me. you traitor..." [if killed]

Asriel Dreemurr (is the boss of the Genocide Route)
Flavour Text*Legendary being made of hopes and dreams. [check]
*The Absolute GOD of Determination! [check after transformation]
*It's the end. [neutral before transformation]
*Asriel charges/calls on/readies (attack name). [neutral]
*You think about why you're here now... you can feel the empty space in your inventory get smaller! [dream]
*Your inventory filled up with dreams. [dream #2+]
*You hold on to your hopes. You reduced how much DAMAGE you'll take this turn! [hope]
*You kept holding on. DAMAGE reduced! [hope #2+]
*ASRIEL blocks the way! [encounter]
*Asriel hopes to stop you from ending the world. [neutral]
*Can't move your body. [struggle #1-4]
*Can't move your body. Nothing happened. You tried to reach your SAVE file. Nothing happened. You tried again. Nothing happened. It's impossible. Just give up already. [struggle #5]
*!?!? [after all buttons disappear except MERCY and FIGHT]
*You reached out to Asriel's SOUL. It's the only one left now. You try your hardest to break it in two. But nothing happened. [attack]
*You tried your best to break Asriel's SOUL. But it failed. [attack #2+]
*You feel your own SOUL resonating! [after attacking twice]
*Your SOUL is strongly resonating! Asriel looks terrified... [after attacking five times]
*Strangely, now you felt stronger. Like you could do anything. DETERMINATION. You were finally able to push apart ASRIEL's SOUL! [attack #6]

Quotes"You know... I don't care about you anymore."
"After I defeat you and gain control over the timeline... I just want to reset everything."
"Everyone will finally be happy again."
"Then we can try this again."
"But you don't want that, do you?"
"You just want to see everyone dead."
"That sickens me."
"It really does."
"Because, for some reason, you chose to make everyone's lives a misery."
"But I won't let you do that."
"I came on your journey because I wanted to help you. Become your best friend."
"But seeing you kill everyone... it was really disturbing."
"ENOUGH messing around! Time to eradicate you!"
"... even after THAT, you're still standing there in my way?"
"NO! I won't let this world down! Behold my true power!"
"Every time you die... your grip on this world slips a little. You're a little more discouraged every time."
"No! NO! You can't do this to me! (name), I trusted you! (name), did I really do anything wrong? I just wanted to be your friend... (name)... [killed]