Reiji Kiriya Enemies

Oga's only friend who is a non-delinquent and lacks any fighting ability. Although he sometimes acts rational and passive, he does have a small "evil" side and a perverted mind when it comes to girls.

A student of Saint Ishiyama Academy as well as a member of the Six Knights. He also happens to know Oga and Furuichi from middle school.

The leader of the Six Knights, Miki's teacher and the student council president.

A strong fighter who becomes the earthly father of the Demon King's son, Beelzebub.