Board Thread:General Discussion/@comment-34798955-20180310144518/@comment-34645353-20180313015644

Wait, so what were you saying? They are only evil once you completed the Genocide route?

I believe they are more corrupted than evil. Completing a Genocide route corrupts them and your save file forever. They are basically like Flowey, since you made them a soulless monster. They can't feel anything for anyone after you kill Asriel/Flowey since you forced them to watch you kill their family and the monsters they cared about, so they are numb to killing even their adoptive father.

Honestly I get why people think Chara is evil. Most fan art makes them evil, and people just don't want to blame themselves for ruining their game. It is their fault, though, and blaming a child for killing everyone is pretty low.