Trainer acts as the main coach for Team Spica at Tracen Academy, employing unconventional and relaxed methods that prioritize instinct over direct racing strategy instruction. He balances this casual approach with strict physical training standards. His carefree and impulsive personality frequently sparks humorous incidents—particularly when he initiates unpermitted physical contact like grabbing thigh muscles to assess running potential—leading to distrust during initial encounters and resulting in pupils bullying or kicking him. Financially irresponsible, he routinely borrows from colleague and rival Hana Toujou to cover basic expenses like meals or bar tabs. Their dynamic blends professional competition with Hana’s occasional romantic advances, which he dismisses or overlooks. He depends on her for practical support beyond financial assistance. With Team Spica, he shares a long-standing, tolerant rapport with Gold Ship, enduring her unpredictable antics. He maintains grounded, supportive relationships with Daiwa Scarlet and Vodka, intervening when their rivalry escalates. His bond with Special Week evolves from early suspicion—triggered by his invasive physique assessments—to mutual trust through emotional support and effective coaching. In the "BNW no Chikai" OVA, he aids Team Spica’s efforts to organize a reconciliation relay race for the estranged BNW trio. He assists in event promotions and collaborates with Hana, though his secondary role aligns with his coaching style, emphasizing team cohesion without central narrative involvement. No significant character development or expanded background appears in other documented media. His consistent appearance features brown hair in a short ponytail, yellow eyes, stubble, and a habitual lollipop stick. He stands 180 cm tall, wearing a yellow button-up shirt, unbuttoned black waistcoat, black pants with a white belt, and plum-colored leather shoes.