Enma Daioh

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

Appearance
A gigantic human, Emna wears traditional japanese robes, have a big beard and wears a crown with the Kanji 王, that stands for king, on it.

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

Invading Hell
When Lady Sati and Team "Myooh" invaded Hell to steal the four remaining Great Elemenental 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 anime.