Onsokumaru is a major supporting character in Ninin ga Shinobuden, a mischievous and highly perverted tanuki-like ninja who frequently causes chaos for the series’ main cast. He serves as both comic relief and a recurring source of trouble, often scheming, teasing, or manipulating others for his own amusement. Despite his selfish behavior, he is memorable for his energetic personality, exaggerated reactions, and role in driving many of the show’s slapstick and parody-style jokes.