Malebolgia

Malebolgia was originally considered an embodiment of The Devil within the Image produced series known as Spawn - however after the entity was defeated by Spawn his status as Lord Of Hell was passed onto Mammon, Malebolgia's position as Lord Of Hell fell even further into decline when the true Satan of Spawn's world revealed himself after centuries of banishment alongside his cosmic-twin God (though it is worth noting "God" in Spawn is not the same being we think of in religious terms).

Malebolgia acted as the chief antagonist of Spawn for over 100 issues until his ultimate downfall and held great power, though it was later revealed he was "but a flea" compared to beings such as Mammon, yet for a long time such beings served him loyally (or at least acted loyal) - one of Malebolgia's most infamous henchmen was the Violator, who would become an archenemy of Spawn throughout the series.

Malebolgia was obsessed with creating an army of Hellspawn by which to spark the apocalypse and tear down the gates of Heaven and make Earth into a living Hell - the rebellion of Spawn proved to be a thorn in Malebolgia's side and ultimately his demise.

Movie appearance
Malebolgia was in the live action movie Spawn as the secondary but most prominent antagonist. He through his right-hand man the Violator, bargain a deal with the man named Jason Wynn to create a powerful man-made substance, a deadly virus to bring more deaths and collect more human souls in exchange for Wynn's control over the Earth. Malebolgia ordered his loyal servant to request Wynn to recruit an important soldier for them, for Malebolgia has chosen a general to lead his dark army. That chosen candicate was the government assassin Al Simmons.

Videogame appearance
Malebolgia appeared in the Spawn videogames including Spawn: Armageddon.