In Japanese Buddhist mythology, oni are depicted as monstrous demons who serve as guardians and tormentors of Jigoku, the Japanese hell. They are often described as large, muscular creatures with horns, sharp teeth, and often red or blue/green skin. Oni are believed to be the punishment for wicked souls and are known for their immense strength and destructive power.
Enma Daiō's Servants:
They are depicted as working directly under Enma Daiō, the ruler of hell, and are often portrayed as brutal and ogreish.
Oni are entrusted with executing the harsh punishments meted out by Enma Daiō, the king of hell, on the souls of the damned.