Mephisto

Mephisto is Marvel's demon lord — a vastly powerful extradimensional entity who rules his own hellish realm and collects souls. Though not literally Satan, Mephisto fills that role in the Marvel Universe, tempting heroes with deals that always come at terrible cost. His most infamous act is the One More Day deal with Peter Parker, in which Spider-Man trades his marriage to Mary Jane to save Aunt May's life — one of the most controversial storylines in Marvel history.

Mephisto Comics