So, who would you like to see turn heel/face?

Pretty simple, guys. Who would you like to see become a heel? Who would you like to see as a face? I know everyone's gonna probably want to see John Cena turn heel but let's face it, it's not gonna happen. There isn't really many people I'd like to see turn face, as whoever I have in mind is already doing well as a heel, and why kill all that momentum? As for someone turning heel, I would love to see Kofi Kingston turn heel. Just to see where he could go with it and what his reason would be. Maybe something along the lines of: "For years, certain people have held me back. Certain people have held me down. No longer. If no one is going to give me the opportunity I need, then I'll have to take it for myself." Something like that, anyway. So now I throw it over to you guys. This oughta be interesting.