[@Puffhead] Yeah, with mutant, I meant Rifter. 

He'd replace Aiden. Main reason why I felt skeptical towards playing Aiden is that, RPing all of his mental issues will eventually get really difficult. His power is also a bit hard to manage. If you want Aiden as an NPC, go for it. If you like him that much, I'd be honored if you wanted to keep him as an NPC.