Voice Description: I imagine C!Chara's voice to be that of a young child, and a quite a cunning one. They are an anti-hero, they are very manipulative and stubborn.

Behavior from UnderVerse Wiki

Behavior:

Once X!Gaster transforms him to the X-Event, he plots with X!Frisk for everyone to kill X!Gaster. Later on, his experience with Cross wasn't really a nice one, as he tries to manipulate him into doing things he wouldn't do, and verbally insults him and others he finds unremarkable. After he gets a human soul, he's shown to be a sadistic child who would continued to make everyone suffer at his own will. Even so, he's too much of a talkative person, where his chats would eventually bore Nightmare!Sans.