Enma Daioh

Enma Daioh (閻魔大王) is a fictional character in the Shaman King manga and anime series. 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.

Patch Tribe originally managed Five Grand Elemental Spirits in a holy commune where spirits of the tribe would go after they die. However, the elemental spirits were too powerful to be controlled by human class spirits, and after the incident of Hao, Patch Tribe decided to entrust the elemental spirits to gods who rule respective hells. However, some gods such as Satan and Lucifer were considered to be inappropriate because they are "too famous" and "too powerful to be controlled by agreements", therefore Enma Daioh and Anubis and Izanami and Mephistopheles were chosen because of their personalities to respect agreements, and are "less known" and "less noticeable".

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 Grand Elemental Spirits, Sati faced off against Enma Daioh in order to retrieve the Spirit of Earth. Enma Daioh and Sati knew each other for long time, however as Enma Daioh was bound by the contract with Hao, Enma Daioh refused Sati's request, and Sati had no choice but to fight the king.

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