Height: 164cm, Class: Featherweight, Birthday: November 23rd. A former professional boxer belonging to the Kamogawa Boxing Gym. During high school, he was bullied by Masahiko Umezawa and others on the riverbank until he was saved by professional boxer Mamoru Takamura, which inspired him to start boxing. Having helped out at his family's fishing boat business since childhood, his punches delivered from his well-trained physique possess enough power to knock out opponents in a single blow. He possesses signature moves such as the "Gazelle Punch," "Liver Blow," and "Dempsey Roll." He has a timid atmosphere and speaks politely. He addresses others with "-san."

Height: 171cm, Class: Junior Lightweight, Birthday: October 10th. A professional boxer belonging to the Kamogawa Boxing Gym. During high school, he and Aoki were beaten up by Takamura, and he started boxing to defeat him. He has been inseparable from Aoki since kindergarten. He is quick-witted and socially adept, with a high ability to sense danger regarding Takamura's pranks. Although Lightweight is his natural weight class, he shows his loyalty to his friend by choosing to compete in the Junior Lightweight class, despite the difficult weight cuts, just to avoid being in the same class as Aoki.

Height: 185cm, Class: Middleweight to Junior Middleweight, Birthday: July 7th. A professional boxer belonging to the Kamogawa Boxing Gym. During high school, he had too much energy due to his blessed physique and overly aggressive personality, spending his days fighting until he was scouted by Genji Kamogawa, the chairman of the Kamogawa Gym. He has a self-centered and wild personality, often dragging those around him into his unreasonable behavior. On top of that, he loves pranks and messes with others at every opportunity. Aoki is his primary victim. He is one of the strongest boxers in the series, having even defeated a bear with his bare hands. However, since there were no witnesses, everyone is skeptical. He is a womanizer.

Height: 172cm, Class: Featherweight, Birthday: August 27th. A professional boxer belonging to the Kawahara Boxing Gym. The OPBF Featherweight Champion. He originally belonged to the Kamogawa Boxing Gym, but after losing to Ippo in a sparring match, he transferred to the Kawahara Gym. The reason for the transfer was that it is difficult for members of the same gym to face each other, and one of them had to move for them to fight Ippo in a professional ring.

Height: 171cm, Class: Lightweight, Birthday: September 9th. A professional boxer belonging to the Kamogawa Boxing Gym. During high school, while he and Kimura were getting into trouble, he met Takamura and challenged him to two fights, both of which ended in his defeat. He joined the Kamogawa Gym to somehow defeat Takamura, but as he continued training, he discovered the joy of boxing and decided to turn professional. His boxing style is characterized by tricky tactics like the "Frog Punch" and "Look Away" to bewilder opponents. He is often mocked by the world champion, Takamura.

Former Japanese Featherweight Champion. Known as the "Rocky of Naniwa." From Osaka.