Blackheart
Blackheart is a fictional demonic entity from Marvel Comics and the son of Mephisto, as such he is a creature of immense supernatural power and pure evil that is comparable to an arch-demon in status: although not quite as powerful as his father, Blackheart is more than a match for any of Earth's heroes and has faced many of Marvel's greatest heroes in battle. He serves as one of Ghost Rider's main enemies.