Great King Enma

Enma Daio, also known as Great King Enma, is a frightening and demonic entity from ancient Buddhist mythology as well as Far Eastern beliefs, due to such a wide-reaching influence his appearance and traits may differ from region to region but in general he is seen as one of the thirteen judges of Hell (though it is somewhat misleading as he is most active in the realm of Meido, where souls are sent on many trials to decide if they may pass to Heaven (Tengoku) or Hell (Jigoku). However, he is the Judge who is responsible for ensuring every soul that ends up in Jigoku is given their proper amount of torture and stay, which can vary from centuries to measures of time so vast it is said to be beyond understanding).