Casper: The Friendly Ghost

Casper used to be one of the three most powerful archdemons along with Balthazar and Melchior. But once Melchior betrays them, the friendship between the three was broken, leaving only the dying Balthazar as his only friend. Casper has a child-like demeanor and often say cruel words with a cheerful attitude. He turned himself into a young child in order to mimic Balthazar's curse. Casper does this to poke at Balthazar's small stature but he truly cares for his friend. After all, he gave Balthazar one of his eye's in order to save his life.