Loki

God of mischief (and in some versions chaos) in Norse mythology. Trapped in the body of a child, he seeks a way back to the realm of the gods and his original body.

He is the father of Fenrir, Yamino, and Hel. He also has an aversion to deep water as well as a possibly small case of amaxophobia since he seems to hate riding in cars.

Loki is more wild and silly in the manga than he is in the anime. He has many romantic interests and seems to care a lot for Mayura.

(Source: Wikipedia, edited)