I think Peter is going to end up the ultimate here (eventually). He needs to come to terms with a few issues. Basically he needs to stop acting like a douche bag, and grow some testicals. Once he gets that figured out, he will be the "Real Hero" of the show.
For now, though, I will have to say Hiro. He is the one that is taking control over his power and using it to help save the world (For the most part). He has the best and most unselfish intentions out of any of them. Peter is to concerned with Caitiln right now to think straight. He only wants to get the virus to save her, not the world.
Please brink bag the cool Peter of the end of last season. Please.

