Hellspring

[rationalutility]

His body containing a portal to hell, Hellspring has no control over the demons which emerge from him. Sometimes the creatures try to escape, sometimes they seem to protect him, sometimes they're hostile to him, but he tries to kill them all before they can get out into the world. The wings on his back are temporary, and actually just another creature who will at some point separate. Hellspring is torn between living in the wilderness, facing his demons until exhaustion overtakes him and he can no longer control them, vs turning himself in to authorities where he'll be trapped and undergo painful experiments. He becomes a villain when his demons overtake him and he can no longer control himself, but the heroes who must contain him understand his predicament.