Bio names are in original Japanese "FAMILYNAME FIRSTNAME" order.
|First Manga Appearance: Chapter 163
School: Teikei University
Clubs: Teikei University Karate Team
Notable Features: Known for his karate skills; participated in the Kanto tournament; hates guys with pompadours
An associate of the two bullies who target Tamaru Yoshio. Despite his renowned karate skills, he is easily beaten by Eikichi.
|GPz 900R Ninja Rider|
|First Manga Appearance: Chapter 165
Gangs: Yagyo Atsuki
Transportation: Kawasaki GPz 900R Ninja
Weapons: Bike chain
Notable Features: Wears a Simpson bike helmet; covers his face with bandages; appears to be the leader of the Yagyo Atsuki gang
A mysterious unnamed man who leads the Yagyo Atsuki gang. He has the tendency to leave an "oni" symbol on the scenes of his attacks.
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He first appears attacking Honma Atsushi in front of the Oni-baku to prevent him from revealing Yagyo Atsuki's identity. He leads the demons on a series of attacks on the Oni-baku Gumi, including Nagisa and Ryuji at their home and Tsukai at the school gym. Because he wears bandages on his face, he was initially thought to be Kamishima by Nakajo and the Oni-baku, however, once his face is revealed, it was a face unknown to the Oni-baku. Although he acts as leader of the Yagyo Atsuki, he does not know the true identity of its leader, as shown when he was caught and threatened by the Oni-baku for information.