Tokai Teio is a horse girl inspired by the real Japanese thoroughbred racehorse. She has long amber-brown hair tied in a ponytail with a pink ribbon, featuring a distinctive white streak in her bangs, sky-blue eyes, and stands 150 cm tall. Her racing outfit consists of a regal white and blue jacket with a red cape, epaulet, and four gold buttons symbolizing her major race wins, complemented by a zigzag-patterned sash reflecting her jockey silks. Born April 20, she radiates boundless confidence, natural racing talent, and cheerful optimism. She uses the pronouns "boku" and "wagahai," displaying prideful and occasionally cheeky tendencies—such as feigning depression to seek attention from her idol, Symboli Rudolf, whom she intensely admires due to her lineage as Rudolf’s offspring. This fuels her ambition to become the top racer and achieve the Japanese Triple Crown. Skilled at befriending others, she harbors a fear of doctors and exhibits the "Teio Step," a light-footed gait from exceptional joint flexibility. Initially a rival to Mejiro McQueen, she later joins Team Spica after bonding with members. Her early career peaks with an undefeated streak, including Satsuki Sho and Tokyo Yushun victories mirroring her real-life 1991 Double Crown wins. A catastrophic leg injury triggers repeated fractures and extended rehabilitation, shattering her confidence and motivation, causing withdrawal from competitions and an identity crisis beyond racing. During recovery, interactions reshape her motivations. After McQueen sustains a similar injury, Teio visits her in the rain, declaring her intent to inspire others. This shifts her goal from personal accolades to supporting peers, especially McQueen. Her resolve culminates in the Arima Kinen, where she overcomes physical exhaustion and a year-long hiatus for a dramatic comeback victory, the "Miracle Run," symbolizing growth from seeking invincibility to embracing perseverance and mutual support. Relationships drive her development: McQueen evolves from rival to close friend and motivator, while Trainer provides steadfast guidance with customized rehabilitation. Teio influences peers like Rice Shower and Mihono Bourbon through resilience. Post-comeback, she adopts a mature outlook focused on inspiring others over maintaining an unbeaten record. Her legacy centers on overcoming adversity, transitioning from a prodigy fixated on emulating Rudolf to a symbol of determination—emphasizing that passion and support forge miracles beyond victory.