The Oniguma (オニグマ) is the animal from the myth of Ninannah which eats girls as sacrifice.
It is the titular antagonist of the Spirit Bear Arc.
The Oniguma resembles an impossible huge bear that can tower over houses. It is covered in countless arrows which have pierced on its back, giving it the appearance of having spikes from from its skin.
It was alleged that humans descending on Ninannah had robbed the wealth of the Oniguma and began to eat humans from anger.
Fushi fought the "Oniguma" in Ninannah.
After the Oniguma's death, its spirit followed Fushi for several centuries.