Masaru Aoki

(青木 勝, Aoki Masaru?) is Ippo's senpai and Kimura's best friend. Aoki provides much of the gym's comic relief and exercises one of the world's most unusual fighting styles. A few of his signature techniques include the fan-favorite Frog Punch, double punch, an untorqued (ineffective) corkscrew punch, and the utterly ridiculous Lookaway (which has also been adopted by Takamura). In the past, he and Kimura were the toughest high-school thugs around, but now Aoki's real job is at a ramen restaurant. Due to the numerous times being dumped by the pretty girls in high school, he's developed a taste for women with unattractive faces. He has fought for the Japanese lightweight championship and shares an apartment with his girlfriend, Tomiko, a friend of Kumi Mashiba whose nice personality and good body more than compensate for her less-than-stellar face. Aoki seems to be based on either former world champion Jorge Paez, or hardcore fight fan hero Emanuel Augustus for their offbeat fighting styles and records. His current record stands at 20 Matches 10-6-4 (W-L-D), with 6 KOs, and the best rank he reached is 1st in Lightweight. His signature "Look Away" technique is based on a skill former World Middleweight Champion Jake LaMotta had used in his career.

Aoki is ranked 7th in JBC Lightweight rankings.
Voiced by: Wataru Takagi (Japanese), Jim Taggert (English)