Board Thread:Describe the above user's avatar/@comment-30231428-20170404065851/@comment-32487879-20170415155413

Addfire wrote: While initially cast in a sympathetic light, Asriel admits at the end of the True Pacifist Route that Chara "...wasn't really the greatest person." Asriel states that Chara climbed Mount Ebott for an unhappy reason, and adds that Chara "hated humanity". Chara never told Asriel the reason that they had such hatred. Asriel also mentions that Chara "laughed it off" when the two of them accidentally poisoned Asgore by putting buttercups instead of cups of butter into a butterscotch pie they made for him. At the end of the Genocide Route, Chara behaves in a polite, deliberate manner, thanking the protagonist for guiding them. However, if the protagonist refuses to destroy the world, Chara immediately becomes malevolent, despite the outward semblance of youth and innocence. Chara reveals that the protagonist's "determination" and "human soul" awoke Chara from death as soon as the protagonist entered the Underground. Perhaps a misunderstanding has come between us.

Chara hates humanity, holding grudges, well, from before. Laughing had been a mechanism that simply is for coping. Many examples of this has been shown, such as Snowdrake's father laughing for no reason at all. At the end of the Genocide Route, one must realize that Chara's hatred for humanity is not misplaced, after you've killed every single monster who's accepted Chara into the Underground. They simply turn malevolent, because despite whoever you may be talking to, Chara is simply another mirror of you. Your own goodwill betrays you in the end, as it's disgusted at how you think you can escape consequences.

So really, Chara's not at fault. It's simply you who disgusts them for all reasons.