Sans

Sans would try to kill you when you meet in Snowy Beginnings but he would friend you one you spare him. In the end of the Genocide Run he would kill you in Judgement Hall with Gaster Hands. Origings are unknown on why he has the Gaster Hands. You would also get a Chara Jumpscare one you get killed. In the True Pacifist Route once the barrier is broken you would be released but the humans would surround the mountain and capture the monsters to their jail then, you'll have to get Edgytale Above to play the next phase of this game.