My AUs (that were totally not made last minute just for plot)

My Main Headcanon

AN: I know that this is very far from canon, and that Ink and Dream aren't this blind and evil and are happy-go-lucky little midgets, but this is my own multiverse AU. Any hate and you will get reported. This doesn't include some comments like 'this isn't what happened, Nightmare ate the apple of his own accord' since that is just stating a fact and not hating on it, I can tell pretty easily what is what. Also I found this image, credits to the owner.

Dreamtale:

Nightmare was brutally bullied, and tried to tell Dream. Dream never believed that it was his friends, and just passed it off as Nightmare accidentally injuring himself by falling off a branch or having a nightmare and injuring himself. Nightmare started to distance himself from Dream, which he noticed and questioned Nightmare about, but Nightmare didn't say anything and just left, once even pushing Dream away. Dream misunderstood as Nightmare being grumpy that Dream didn't believe him, and started paying more attention to him and snuggling close when they slept, only to wake up to Nightmare up in the tree on one of the branches where Dream couldn't get to him. Eventually Nightmare snaps and eats the apple with the entire village onlooking. Dream arrives midway into Nightmare's painful transformation, and concludes that something took over his brother and that Nightmare was just trapped in all that negativity goop. Dream rushed over to try and 'save' Nightmare, but Nightmare was still in pain and blinded by anger, so he started attacking everyone and killing the villagers. Dream got stabbed and turned to stone, which is when Nightmare finally came back to his senses and realized what he did. He broke down right there in front of Dream and stayed there until Error came. Nightmare ran away and found a dimension that was created when Nightmare's transformation into goop lord happened and decided to stay at the suspiciously-him-themed castle he found that also suspiciously had a room designed just for him and a room with a door that looked like Error. (There are also rooms themed for Killer, Horror, Dust, and Cross, who arrive in that order. Error comes in between Dust and Cross and settles down after Cross.)

Undertale: Something New:
Sans had experienced a pacifist timeline twice and a true pacifist timeline once, but those timelines never happened again. Soon after the true pacifist timeline ended a RESET happened that was a neutral run. Then another RESET happened and this time, it was a genocide. Frisk did the genocides over and over again, unknowingly corrupting Chara and causing him(Chara) to want to kill everyone in the underground quickly in hopes that they wouldn't be in pain like Frisk caused them with all their(Frisk) traps that would leave monsters out to die slowly and painfully. After about 9165 genocide runs, Chara managed to make a deal with Sans that they had proposed 15 genocide runs beforehand: Chara and Sans merge their SOULs, allowing Sans to have DETERMINATION, and Sans quickly kills all the inhabitants of the people beyond the Ruins to gain more LV and DETERMINATION than Frisk, and then kill Frisk and RESET the timeline. This would have worked because the one with the most DETERMINATION was in control of SAVE, LOAD, RESET, and whatever-other-power-that-let-people-save-files-or-whatever-it-did-I-can't-remember. So Sans agreed to the deal, and their SOULs merged, becoming STAGE 1, an upside down white heart with a red outline. After Sans killed the inhabitants of Snowdin, his SOUL became STAGE 2, the classic target, and killed the rest. Then he went to the door to the Ruins to wait for Frisk. They fought, and Frisk was nearly killed.

They tried to RESET but Sans summoned a bone out of the ground out of pure instinct and adrenaline from their fight and shattered the button, before summoning a DT knife and killing Frisk. After all of that, he got up and tried to RESET, but it didn't work. His SOUL was spazzing out, and he was panicking a whole lot, unknowingly attracting Nightmare's attention. His SOUL goes into STAGE 3 just as Nightmare comes to see what's happening. He sees Sans panicking there with a large amount of bones, and goes over to try and comfort Sans. Sans however, with his SOUL in STAGE 3, attacks Nightmare out of pure instinct and the fact that when his SOUL is in STAGE 3, he attacks everyone. The two fight for a while before Nightmare manages to catch the tired Sans and pin him against a tree, asking what happened. Sans just broke down immediately and started bawling out his now-non-existent-eyes-that-now-had-HATE-dripping-down, and nonsensical talking came out. Nightmare just comforted Sans, waiting until he was calm to reexplain. *insert explanation of both Killer's AU and the AUs* Nightmare offered Sans to leave his AU and live with him, which is what he did, and also requested that Sans change his name to Killer, as he had passed a door that had a metal plate with 'Killer' written on it with fancy hand writing themed like him. Killer agreed, and his SOUL changed back into STAGE 1.