Oniguma

The Oniguma (オニグマ, Oniguma) was an animal that resided in Ninannah.

It was the titular antagonist of the Spirit Bear Arc, but became one of Fushi's revived companions in the New World Arc after bonding with March.

Background
This impossibly large white bear roamed Ninannah until its defeat at Fushi's hands, and was said to be the guardian Spirit Bear that brought peace and prosperity to the land, but had to be given a yearly sacrifice of a pure, young girl to appease its hunger. Over its life, it had many arrows shot into its hide, resulting in an intimidating, spiked appearance, and was known to bring disaster to those who crossed its path.

Personality
The Oniguma was originally a highly aggressive carnivore, attacking and devouring humans on sight. Its aggression was believed to have stemmed from humans settling in its territory and the violent encounters it experienced. Though it retains its intimidating demeanor after its revival, it listens to March and has since become docile and friendly enough for Fushi to have it utilize its brute strength for bulldozing a part of a house. It also seems to be somewhat intelligent, as it was visibly at peace after being cared for by March before its death and deliberately chose to accompany March and Fushi as a wandering spirit after.

Trivia

 * The Oniguma was the second animal form that Fushi acquired, and the third form overall.