Well, the overall idea is that he starts as one of the most powerful, but over the course of the game, he gradually loses his powers until he's literally just a really clever human. His high is super powerful, but his low is basically a skilled human...which for a being who is used to being able to do whatever he wants, whenever he wants it...well, the knowledge that he could now<em>die</em>and there's not much he can do about it until he gets his powers back? That's an interesting internal dynamic to explore, I think, and that impact is lessened if he starts off as a C-Tier powerlevel character, y'know?