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Description
Sup, so I didn't get to go into more detail with the AT AU chart so I wanted to show some of my personal favorites of my AUs and explain them beyond designs.

AfterSwap [Home Made]
Aka my AfterSwap take. Geno steals Sans' soul and returns to the overworld leaving Sans trapped in the save screen depressed. Frisk, with Geno's help, takes back their body and stops doing genocide runs under threat of Geno erasing the timeline. Papyrus and Undyne think Geno is acting a bit strange but don't know why, but he seems happy so they don't look further. Sans regretfully has to team up with Chara to get his soul back, but due to them combined having barely any DT can only just barely communicate to Geno and Frisk through their dreams.
The swaps here are Sans <-> Geno and Frisk <-> Chara instead of the usual Geno is Papyrus. concept

AfterFell

My Afterfell take is a morality swap of regular Aftertale, which causes Geno and Sans to be more akin to the other Geno [who keeps his name as in Aftertale since there's no reason for it to be different, but he can be referred to as Cide if needed] wants to reason with Chara and stop the resets, but is in a constant state of agony due to his death being MUCH more violent then OG Geno's, so has more trouble communicating with Sans, only amplifying their moral disagreement. While he still cares for Papyrus, his worry is more so for the whole timeline rather then just his brother, meanwhile Sans is OBSESSED about Papyrus, never leaving his side and being willing to do anything for him, he wants to get payback against Chara [Like fanon sans in a sense], but he refuses to side with Geno as he can't trust the human and believes talking won't do any good and is just trying to brute force it. His nightmares have gotten worse so he's just stopped sleeping, being awake during the resets instead, causing his mood to worsen even more. His tooth fell out early on during the story after he knocked it out after a nightmare so his gold tooth is to replace it.

AfterHorror
Geno after a prolonged period of no contact begins to feel immense hunger which he quickly gives into, forcing regular Sans to bring him food, but it's quickly realized that he cannot properly absorb monster food anymore due to his weak body and soul, so Sans begins bringing him human food he finds at the dump and from animals falling into the underground. He hates doing the job but is forced to by the animalistic Geno who's hunger is only satisfied shortly by human food. In exchange for his help, Geno helps Sans find a way out of his reoccurring loop of hell.
Inspired by "A secret meeting with Gorefield" and the Muse from Alex Bale's "Don't Feed The Muse."

AfterAfter I believe I've already gone over but here it is again
During a pacifist timeline all is going well, Geno is healing from his mental instability and has physically fully healed apart from his still melted right eye which makes him half blind. Everything is going well until Frisk, out of interest, goes to the save screen, it's been so long since they've done a reset and with Geno around they were unsure if they even could, when they arrive there, they meet Gaster, still there waiting for Geno to return and give into his plan, seeing Frisk here now with a weak body as Chara's prolonged control of them has left them easy to control, giving Gaster an idea, they take over Frisk's soul, inhabiting their body. Knowing that in his current state he couldn't be persuaded, Gaster resets, but due to his control and Geno existing it fucks up the true reset and has Geno and Sans still as different people, they're at first confused but when they meet the murderous and wing ding speaking Frisk, Geno knows what's going on, and so the two confront the human early on, but it seems Gaster's strange nature makes him unable to be killed, eventually he wears out Sans and attacks him, as he starts to dust, Geno does the only thing he can think to do, he drags them all to the save screen, and now that he can't die he's able to banish Gaster, though now Sans and Geno are stuck in the save screen.

Aftertale Disbelief/Body Conflict
During one of Chara's many Genocide routes, Chara gets bored, and decides after this they'll quit this game forever, and finally let the timelines end in the eternal suffering. Noticing that, Geno attempts to warn Sans, but is brushed off as lying yet again, and lets himself die early on to get it over with and get onto the next loop. At the last corridor, Chara is wearing Papyrus' scarf, a mockery of Sans that he can't stop. Frisk then intervenes, fighting Chara for their soul back, helped by Geno who together can barely make contact safely with Chara.

AfterNegative
During a regular Pacifist run, Flowey instead of absorbing the souls, gets annoyed with Sans, maybe he's pissed off at him cause of his puns or just cause he killed Flowey a bunch when he had control of the timelines, anyways, Flowey accidentally slips up and kills him, with all the monsters now attacking at once they subdue Flowey and turn to Sans who's beginning to dust, saying he's cold, Papyrus gives him his scarf to try and warm him up. Frisk then gives him a pie to heal which works but begins to make him unstable cause none of this is supposed to be happening, he then vanishes. Panicking, Frisk resets, but now, instead of all their friends in the save screen they see Sans but with his colours inverted. General story would be Paci trying to get a perfect Pacifist ending but the game is fighting against him cause he's trying to go against what's supposed to happen.

AfterDust
Tried my hand at a decent AfterDust take and I think I have an idea, After many geno routes, Geno's glitch has worsened, with him now only barely able to see through it, and no longer being able to disable it, he has even grown to have his mind be effected by it, barely able to think straight In this worsened state, he re-enters the main timeline, and begins killing monsters, his mind telling him that if he gets stronger from killing monsters he can erase the timeline by over powering the humans DT He now aswell as a phantom Sans, who pleads for him to stop, but he couldn't, even if he wanted to, Geno has become a lost soul, fueled only by the DT of the monsters he kills, the idea of killing Papyrus that previously disgusted him has become reality.

AfterShift
Geno comes to the overworld and steals Chara's soul, of course not being used to not having a vessel to follow, the game sent Chara to the save screen along with Frisk which starts an- uncomfortable conversation, with Chara still unwilling and unable to give up their body as their stolen soul has yet again been stolen. Geno then went to erase the world but ends up realizing that without Chara around he can just take over, so instead he decides to overthrow Asgore and prepare fiercely for the next human that he believes will eventually arrive, using flattery and predictions to take rule, abusing his abilities at every turn.

Finally, now that that's done, onto the credits

Undertale By Me
Aftertale By CrayonQueen
AfterSwap By NSFWShameCave
AfterFell By SwappyBlue
AfterHorror By IDK
AfterAfter By IDK
Aftertale Disbelief By Again no idea
AfterNegative By Me
AfterDust By The Soviet Union
AfterShift By Me [fr]

Description
Sup, so I didn't get to go into more detail with the AT AU chart so I wanted to show some of my personal favorites of my AUs and explain them beyond designs.

AfterSwap [Home Made]
Aka my AfterSwap take. Geno steals Sans' soul and returns to the overworld leaving Sans trapped in the save screen depressed. Frisk, with Geno's help, takes back their body and stops doing genocide runs under threat of Geno erasing the timeline. Papyrus and Undyne think Geno is acting a bit strange but don't know why, but he seems happy so they don't look further. Sans regretfully has to team up with Chara to get his soul back, but due to them combined having barely any DT can only just barely communicate to Geno and Frisk through their dreams.
The swaps here are Sans <-> Geno and Frisk <-> Chara instead of the usual Geno is Papyrus. concept

AfterFell

My Afterfell take is a morality swap of regular Aftertale, which causes Geno and Sans to be more akin to the other Geno [who keeps his name as in Aftertale since there's no reason for it to be different, but he can be referred to as Cide if needed] wants to reason with Chara and stop the resets, but is in a constant state of agony due to his death being MUCH more violent then OG Geno's, so has more trouble communicating with Sans, only amplifying their moral disagreement. While he still cares for Papyrus, his worry is more so for the whole timeline rather then just his brother, meanwhile Sans is OBSESSED about Papyrus, never leaving his side and being willing to do anything for him, he wants to get payback against Chara [Like fanon sans in a sense], but he refuses to side with Geno as he can't trust the human and believes talking won't do any good and is just trying to brute force it. His nightmares have gotten worse so he's just stopped sleeping, being awake during the resets instead, causing his mood to worsen even more. His tooth fell out early on during the story after he knocked it out after a nightmare so his gold tooth is to replace it.

AfterHorror
Geno after a prolonged period of no contact begins to feel immense hunger which he quickly gives into, forcing regular Sans to bring him food, but it's quickly realized that he cannot properly absorb monster food anymore due to his weak body and soul, so Sans begins bringing him human food he finds at the dump and from animals falling into the underground. He hates doing the job but is forced to by the animalistic Geno who's hunger is only satisfied shortly by human food. In exchange for his help, Geno helps Sans find a way out of his reoccurring loop of hell.
Inspired by "A secret meeting with Gorefield" and the Muse from Alex Bale's "Don't Feed The Muse."

AfterAfter I believe I've already gone over but here it is again
During a pacifist timeline all is going well, Geno is healing from his mental instability and has physically fully healed apart from his still melted right eye which makes him half blind. Everything is going well until Frisk, out of interest, goes to the save screen, it's been so long since they've done a reset and with Geno around they were unsure if they even could, when they arrive there, they meet Gaster, still there waiting for Geno to return and give into his plan, seeing Frisk here now with a weak body as Chara's prolonged control of them has left them easy to control, giving Gaster an idea, they take over Frisk's soul, inhabiting their body. Knowing that in his current state he couldn't be persuaded, Gaster resets, but due to his control and Geno existing it fucks up the true reset and has Geno and Sans still as different people, they're at first confused but when they meet the murderous and wing ding speaking Frisk, Geno knows what's going on, and so the two confront the human early on, but it seems Gaster's strange nature makes him unable to be killed, eventually he wears out Sans and attacks him, as he starts to dust, Geno does the only thing he can think to do, he drags them all to the save screen, and now that he can't die he's able to banish Gaster, though now Sans and Geno are stuck in the save screen.

Aftertale Disbelief/Body Conflict
During one of Chara's many Genocide routes, Chara gets bored, and decides after this they'll quit this game forever, and finally let the timelines end in the eternal suffering. Noticing that, Geno attempts to warn Sans, but is brushed off as lying yet again, and lets himself die early on to get it over with and get onto the next loop. At the last corridor, Chara is wearing Papyrus' scarf, a mockery of Sans that he can't stop. Frisk then intervenes, fighting Chara for their soul back, helped by Geno who together can barely make contact safely with Chara.

AfterNegative
During a regular Pacifist run, Flowey instead of absorbing the souls, gets annoyed with Sans, maybe he's pissed off at him cause of his puns or just cause he killed Flowey a bunch when he had control of the timelines, anyways, Flowey accidentally slips up and kills him, with all the monsters now attacking at once they subdue Flowey and turn to Sans who's beginning to dust, saying he's cold, Papyrus gives him his scarf to try and warm him up. Frisk then gives him a pie to heal which works but begins to make him unstable cause none of this is supposed to be happening, he then vanishes. Panicking, Frisk resets, but now, instead of all their friends in the save screen they see Sans but with his colours inverted. General story would be Paci trying to get a perfect Pacifist ending but the game is fighting against him cause he's trying to go against what's supposed to happen.

AfterDust
Tried my hand at a decent AfterDust take and I think I have an idea, After many geno routes, Geno's glitch has worsened, with him now only barely able to see through it, and no longer being able to disable it, he has even grown to have his mind be effected by it, barely able to think straight In this worsened state, he re-enters the main timeline, and begins killing monsters, his mind telling him that if he gets stronger from killing monsters he can erase the timeline by over powering the humans DT He now aswell as a phantom Sans, who pleads for him to stop, but he couldn't, even if he wanted to, Geno has become a lost soul, fueled only by the DT of the monsters he kills, the idea of killing Papyrus that previously disgusted him has become reality.

AfterShift
Geno comes to the overworld and steals Chara's soul, of course not being used to not having a vessel to follow, the game sent Chara to the save screen along with Frisk which starts an- uncomfortable conversation, with Chara still unwilling and unable to give up their body as their stolen soul has yet again been stolen. Geno then went to erase the world but ends up realizing that without Chara around he can just take over, so instead he decides to overthrow Asgore and prepare fiercely for the next human that he believes will eventually arrive, using flattery and predictions to take rule, abusing his abilities at every turn.

Finally, now that that's done, onto the credits

Undertale By Me
Aftertale By CrayonQueen
AfterSwap By NSFWShameCave
AfterFell By SwappyBlue
AfterHorror By IDK
AfterAfter By IDK
Aftertale Disbelief By Again no idea
AfterNegative By Me
AfterDust By The Soviet Union
AfterShift By Me [fr]