If you were to use sprites for the people, one already exists for
Kojinka, but it's small, missing a walk animation, the trench coat is not complete, and the right arm moves unrealistically. Ah, and there's no fighting animations. Something could be based on it, though.
This is all hypothetical, of course. I don't think anyone would finish a project like that. If only I had SFML working! Then I could make something in C++!