Otowa Gym
- Ryūichi Hayami (速水 龍一, Hayami Ryūichi?)
- Known by the nickname "The Prodigy" he was a prodigy outboxer with incredibly fast punches, he is known for his "Shotgun", a barrage of fast punches intended to down his opponent quickly and decisively. Although he was a former Inter-High Champ, he lost to Ippo in the last second of the first round of the East Japan Rookie King Tournament. He later moves down to the Junior Featherweight Division where he becomes the JBC Jr. Featherweight Champion. Hayami's character is based on retired world champion Joe Calzaghe for his "Shotgun". After his loss to Kenta Kobashi for the Junior Featherweight championship, he retires from boxing due to his weak chin, seriously damaged in the fight with a one-two combination from Kobashi. He's an incredibly handsome fellow, very popular outside of boxing as a model and teenage idol, and has a legion of female followers who always cheer for him whether he wins or loses.
- Voiced by: Kōji Tsujitani
- Alexander Volg Zangief
- (See Foreign boxers)
- Kyōsuke Imai (今井 京介, Imai Kyosuke?)
- The longtime rival of Itagaki Manabu, Imai was the one boxer who managed to thwart Itagaki in his high-school days. They fought a total of three times in the amateur ring; each time Imai was victorious. His build, KO pattern, and even hairstyle are remarkably similar to those of Itagaki's senpai, Makunouchi Ippo. Imai is ordinarily cool and composed, bearing a poker face even in the heat of battle. Eventually, Itagaki defeats Imai in a heated battle. It seems the only people who can rouse him out of this perpetual calm are Ippo, Itagaki, and Itagaki's sister Nanako -- with whom Imai is very much smitten.
- Voiced by: Yuichi Nakamura
Read more about this topic: List Of Fighting Spirit Characters