Mephisto Pheles

Mephisto Pheles a Devil from the Extra Demons and has been active since the time of the previous Four Great Satans.

Personality
Not much is known about his personality other than the fact that he believes in Liberalism, so he didn't get along with the previous Satans.

History
Some time before the series, he became the current director for the Magician Council. He also has a Longinus possessor as his servant as well.