Eh, I don't see why you guys care so much. If he wants to become a DBZ fanboy and lose all his uniqueness, let him. It would be his loss.

@DF: Not everyone can make a cool new sig as often as you can, and not everyone is as proficient in PS as you are. Or maybe he just really likes the sig. As Comp said, if you oppose the idea so much, why don't you change the sig for him or make him a new one?