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Kōji (こうじ Kōji) is a student of Nekketsu High School but in downtown nekketsu monogatari his face is used in the delinquents His first appearance is in the Famicom version of Nekketsu Kōkō Dodgeball Bu. He also appears in Shodai Nekketsu Kōha Kunio-kun, where he can save the player's game.
- In Super Dodge Ball he is renamed Mike Knopfler and is he is now a member of Team USA.
- In River City: Tokyo Rumble, he is named Curly.
- in River city ransom he is a delinquent of the turf generic dudes and other more turf