Nanatsu

A mysterious warrior from the village of Asakusa. He was found unconscious on the battlefield with Naotora's slain sister, with no memories of his past. He patrols the village dutifully, and is endearingly referred to as the "defense system" by the villagers because of how seriously he takes his job. When he's not on a patrol he's guarding the temple alongside Naotora from any Yo-Kai. Should Asakusa come under threat, Nanatsu can summon black flames that he can manipulate into a variety of shapes for any use he may need.