Board Thread:General Discussion/@comment-26139703-20160516232505/@comment-29938593-20160517014902

Also in other endings after genocide. Chara outright is possessing you and even shows it endgame. She was reawakened because you the player was a genocidal maniac that killed everyone, and she manipulated you to do it, as shown in red text, which is what Chara says or is saying. She may have not caused the genocide, but she was present, right there.

Also even before the player came, Asriel has said Chara hated humanity, and wasn't the best person. Chara took control of the shared body and tried to outright kill the other humans, but refused due to Asriel, but it made Asriel a flower afterwards, and Chara's spirit to be reawakened by the players actions.

Whatever made Chara hate humanity, certainly made her creepy. Like, MEGA creepy.