Trainer embodies the player's role from the mobile game as a supporting figure in the anime, tasked with training Team Spica. He employs an unconventional coaching philosophy that values trusting his pupils' instincts above formal racing strategies, often provoking rebellious reactions due to his seemingly careless attitude. Yet his methods consistently deliver success for the team. He displays brown hair in a short ponytail, yellow eyes, and a habitual lollipop stick. His signature attire includes a yellow shirt beneath an unbuttoned black waistcoat, long black pants fastened by a white belt, and plum-colored leather shoes. Financially irresponsible, he frequently borrows money or meals from colleague Hana Toujou, intensifying their professional rivalry. His training habit of assessing horse girls' thigh muscles sparks recurring misunderstandings and comedic retaliation. Though generally laid-back, he exhibits strict discipline during training sessions. His dynamic with Hana Toujou centers on their clashing methodologies—her organization versus his instinct-driven approach. Among Team Spica members, Gold Ship shares the longest history with him. Production materials once listed "Ryo Nishizaki" and live events used "Okino Trainer," but the character remains officially unnamed in canon. Unlike reserved trainers such as Minamizaka (Team Canopus) or Kuronuma (associated with Mihono Bourbon), Trainer's involvement is confined solely to Team Spica. A modified version of "Umapyoi Densetsu" reflects his perspective, altering lyrics to "My favorite horse" instead of the original "Your favorite horse."