|Birth date||September 11, 1970|
|Height||171 cm (5'7")|
|Reach||171.8 cm (67")|
|Current Affiliation||Hachinohe Boxing Group|
|Previous Affiliation(s)||Hachinohe Kentou-kai|
|Previous Trainer(s)||Hachinohe Coach|
|Wins by KO||4|
|Manga Debut||Round 27|
|Anime Debut||Round 13 (The Fighting)|
|Voice Actor||Masahiro Kobayashi|
Jason Ozuma (ジェイソン・尾妻 lit. jeison ozuma) is a non-recurring character in Hajime no Ippo.
He is a retired boxer who was affiliated with the Hachinohe boxing gym. He was known for his immensely powerful right hooks, intimidating appearance, but surprisingly kind and compassionate personality.
Jason is an African-American soldier stationed at the Misawa Air Base near Hachinohe, Aomori. As trained military personnel, Jason boasts an impressive body structure and is first seen in the weigh-in room with his coach. Ippo, who arrived shortly after, comments on Jason's intimidating height and appearance.
Later seen in the Rookie King Tournament match against Ippo, Jason proves to be a difficult and equally durable opponent. Unrelenting and fearsome, Jason is revealed to have an explosive hook equal to, if not more powerful than, Takamura Mamoru's. However, Ippo's fighting spirit and resolve eventually unnerved Jason, who believed that Ippo could not be hurt. After failing to land a finishing hook, Ippo retaliates with a damaging counterattack, causing Jason to lose his first match. Shortly after, it is revealed by Okita Keigo that Jason has retired due to spine damage from his match against Ippo.
|LOSS||4-1-0||Makunouchi Ippo||KO||2(4), 2:52||1991-06||Tokyo, Japan||East Japan Rookie King Tournament Round 1|
|WIN||2-0-0||Unknown||KO||?(4)||199-||Tokyo, Japan||Match after Pro Debut|
|WIN||1-0-0||Unknown||KO||?(4)||199-||Tokyo, Japan||Pro Debut|
Towering in height compared to Makunouchi Ippo, Jason's appearance can prove to be incredibly intimidating. He has dark brown skin and black hair. His hairstyle, as expected of a man from the military, is cut short and styled neatly to prevent any stray strands to fall in his line of vision. In addition to that, Jason also has a neatly trimmed stubble beard that wraps around his chin and mouth. His eyebrows are short and moderately thick. As seen in the anime adaptation, Jason's eyes are onyx in color.
Despite his fearsome height and overall appearance, Jason possesses a polite and outgoing personality. He is kind, compassionate, and charitable, stating that his reason for boxing is to earn money for his gym. He treats his coach and gym mates like his own family, supporting them and fighting for them with hardened resolve.
Jason is an in fighter like many other characters in the series, most frequently fighting at close range to increase the precision of his immensely powerful hooks. His body, built expertly for an in fighter, has the ability to withstand the punches of the (then still inexperienced, but still powerful) esteemed hard-puncher Makunouchi Ippo.
He is a very slow opponent; however, his power makes up for this. When he throws his signature hook, his body opens up, leaving him very vulnerable to body blows and counterattacks.