Kōji (こうじ) is a student of Nekketsu High School. His first appearance took place 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 Downtown Nekketsu Monogatari, his face is instead used for some of the delinquents.
- 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 face is used in river city ransom delinquent of the turf generic dudes and other more turf.
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