Cho-Oni

A Cho-oni (超鬼) is a type of Oni in the Shaman King manga series.

About
The Cho-onis are introduced in the manga during Asakura Yoh's training in hell. These Onis seem to be the strongest Onis within the Great Spirit, capable of slaying Asakura Yohken with ease. These creatures appear rather sadistic and seem to employ underhanded tactics, striking Yoh with an arrow while he is distracted.

Though not a singular entity like the Oh-oni, these creatures claim to run the hell Yoh is in and employ a variety of weapons, including hammers, bows and arrows, iron clubs, and axes.

Anime/Manga Difference
Cho-Oni is a manga series only character and never appears in the 2001 anime series.