Enma Daioh

Enma Daioh (閻魔大王, "Enma-daiō") is a fictional character in manga series of Shaman King. He is the greatest of the Four Kings of Hell, and the guardian of the Spirit of Earth.

About
As a gigantic being, Emna wears traditional Japanese robes, has a big beard and wears a crown with the kanji "王", which means "king", on it.

When Asakura Hao reincarnated for the first time, he was forced to face Enma Daioh.

When Saigan Sati and Team "Myooh" invaded Hell to steal the four remaining Great Elemental Spirits, Sati faced off with Enma Daioh in order to get to the Spirit of Earth.

Anime/Manga Difference
While he is mentioned, Enma does not appear in person in the 2001 anime series.