Of these, it's probably either of the two protagonists. Though, I like Micah Bells development from a rugged, psychotic outlaw to a Pinkerton spy as a villian, as the player would never see it coming on a blind run. Maybe suspect it, what with the white hat, insistence on walking back into Blackwater, and the wanted poster he has of Dutch as early as chapter 2, but still.

John Marston.