Mephisto

"'Well may you tremble! For you gaze upon... Mephisto!' - Mephisto"Mephisto is an extra-dimensional demon whose origin is unknown. He rules a fiery pocket dimension that he calls "Hell" or "Hades" although it is neither the Hell of the Christian religion nor the Hades ruled by Pluto, the Olympian god of the dead. Mephisto calls his extra-dimensional realm "hell" in order to exploit Earth human beings' belief in a single being of absolute evil, who is often referred to as Satan, who rules such a realm. Mephisto resembles the traditional visual conception of the devil. (It is not known whether this is Mephisto's true appearance, or one that he has adopted in order to resemble the devil). He also allows himself to be called names that human beings give to their conceptions of devils, such as Mephisto, a shortened form of Mephistopheles, the name given to the devil in the Faust legends and of a possible fallen angel.

Indeed, Mephisto has allowed people to believe him to be Satan himself. However, Mephisto is not the Biblical Satan, nor is he an actual devil such as those depicted by Judaism and Christianity. The real Satan has yet to be seen in any account. Mephisto's domain is inhabited by himself, by lesser demons who serve him, and by the astral forms of certain deceased human beings, which have been trapped in the bodies of demons. These demonic bodies imprisoning human spirits have been magically altered to resemble the deceased's mortal human forms. Mephisto is continually seeking to add more spirits of sentient beings to his realm by inducing living sentient beings to submit their wills to his. Mephisto apparently seeks primarily to enslave human souls, although he will go after those of extraterrestrials on Earth as well.

Mephisto's soul was used by the Scarlet Witch to give birth to twin sons, Thomas and William. He reabsorbed them, effectively ending their existence. hey were later reborn Speed and Wiccan.

He is portrayed by Steve Coogan.