Oni

An Oni (鬼) is a kind of yōkai, demon, ogre, or troll in Japanese folklore. They are typically portrayed as hulking figures with one or more horns growing out of their heads.

In Shaman King

 * Cho-Oni
 * Naka-Oni: Anna's O.S. she subconsciously manifested in the Drama CD.
 * Oh-Oni: Naka-oni's evolution after consuming spirits.
 * Zenki and Goki: Hao's guardian spirits after being subdued into his shikigami, and later becoming Anna's upon revived in the present.