Daredevil and Iron Man are also not good examples because they're both darker and more self-destructive characters - Iron Man especially. That's just...
True, it is the simplest solution although I'd also give Cletus-Carnage mad OP regeneration abilities (a la Majin Buu from Dragon Ball), or maybe an...
Come to think of it, Ultron did start spreading a techno-organic virus with his code in it that could convert organic lifeforms into Ultron Sentries,...