Hachinohe Gym
- Jason Osma (ジェイソン・尾妻, Jeison Ozuma?), United States Army
- An African-American soldier stationed in Japan at Misawa Air Base, near Hachinohe, Osma proves a difficult opponent for Ippo in the first round of the Rookie King Tournament. While fearsome in fights, Osma's usual personality is almost unnervingly polite and outgoing. He boxes in order to earn money for his gym, his coach and his training partners, whom he treats like his own family. Osma wields an explosive hook equal even to, if not better than, Takamura's.
- Voiced by: Masahiro Kobayashi
- Naomichi Yamada (山田 直道, Yamada Naomichi?)
- A bashful young man who first joined the Kamogawa Gym as Ippo's follower. His initial nickname was "Geromichi" (a Japanese pun based on the fact that he threw up after every part of training). While in public he is awkward and uncomfortable, Naomichi puts everything into his training for his hope for strength and self-confidence. Having had to move away due to his widow mother's work, Naomichi now boxes for a different gym under the alias "Hammer Nao." His specialty, a solar-plexus blow, was created when he challenged his former senpai and current Japanese featherweight champion, Ippo Makounouchi. Although he appears to front a cold personality as "Hammer Nao", he remains a very kind person at heart. He is also blessed with a very good singing voice. Yamada currently holds a record of 8-1-0 with 5 knockouts and is known to fight anywhere between Featherweight and his natural weight class of Junior Welterweight.
- Voiced by: Daisuke Sakaguchi (Japanese), Tony Oliver (English)
Read more about this topic: List Of Fighting Spirit Characters