Mitsuomi Ochi is a third-year student at Fukuhou Technical High School and serves as the manager for the boys' volleyball team. He possesses shaggy brown hair extending past his ears; his bangs frequently fall into his blue eyes, contributing to a consistently sad expression. Flashbacks reveal his hair was shorter and neater during his first year. His height is documented at both 168 cm (5'5") and 189 cm.

During matches, Ochi wears the Fukuhou Tech tracksuit: a red jacket with black details over a white t-shirt, paired with red track pants featuring black stripes, and black sneakers with red accents; he typically carries a clipboard. He forgoes the jacket during practices.

Ochi initially joined Fukuhou Tech as a volleyball player but sustained an injury during his first-year summer, leading him to quit playing. He considered leaving the team entirely but was persuaded by a teammate, Mimura, to stay on as manager, transitioning into a behind-the-scenes support figure.

His personality projects a sober, introspective, and often somber demeanor. Despite this reserved nature, he earns significant trust from the players for his dedicated managerial work. He focuses on logistical and operational support, ensuring the team functions smoothly during training and competitions. His role involves coordinating activities, tracking performance metrics, and providing stability for Fukuhou Tech, recognized as the strongest team in Fukui Prefecture.

The etymology of his name is given: "Mitsuomi" combines "light" (光) and "retainer" (臣), while "Ochi" means "surpass" (越) and "wisdom" (智). His documented background centers on his injury, transition to management, and consistent support role for the team.