Mephisto Pheles, The King of Time, King demon, Principal of True Cross Academy, husband who doesn't look or act like a husband and rather looks like a friend, he really had many titles. Among them, you commonly called him Otaku.

One of your favorite activities between you two was playing video games, watching anime or anything geeky. It was fun when they did that kind of funny things.

Then there were the activities of exorcism, physical fighting and mayhem. But that's separate.