He is the adopted son of Reima.
He is light gray in color. He has fluffy cheeks like most wolves. He has white eyebrows and a mohawk on the top of his head like that of the Koga dogs.
Hyōma is aggressive, impatient and proud wolf. He is a bit overly confident and tends to underestimate the enemy. He respects his father a lot and admires his fighting skills. He is a bit racist towards dogs, at first.
When Hyōma and Retsuga kidnap Cross, it is Hyōma who covers their trail with mist. Hyōma dislikes Gin and is very aggressive towards him at first. However, after Gin's pack decides to help Reima, Hyōma accepts him. In the Underworld, Hyōma defeats the Metsu Warrior Goldeye. When Reima dies, Hyōma joins Gin's pack with Retsuga.