Tokai Teio is a horse girl character from the *Uma Musume: Pretty Derby* franchise, directly inspired by the real-life Japanese thoroughbred racehorse of the same name. This real horse won major races including the Satsuki Sho and Tokyo Yushun in 1991, suffered significant setbacks from leg fractures, and made a dramatic comeback victory in the 1993 Arima Kinen after 364 days of rest. She exhibits a lively, confident, and enthusiastic personality with a strong passion for racing. Initially aiming to emulate her idol, Symboli Rudolf, by joining Team Rigil and winning the Japanese Triple Crown, she instead joins Team Spica after interacting with them. Her character displays pride and occasional cheekiness, such as feigning depression to gain Symboli Rudolf's attention. While driven to compete, she prioritizes happiness over stressful success. Physically, Tokai Teio is small-statured at 150 cm tall. She has long amber-brown hair tied in a ponytail with a pink ribbon and features a distinctive white streak in her bangs. Her notable traits are sky-blue eyes and an amber jewel accessory on her right ear. Her regal racing outfit includes a white-and-blue jacket with epaulets, a red cape, gold buttons, and a zigzag-patterned sash. This design references both Symboli Rudolf's attire and her real-life counterpart's jockey silks, with the four buttons symbolizing her four major race victories in lore. Her character arc is prominent in Season 2 of the anime. After reaching an early peak, a severe injury disrupts her ambitions. This forces her to reevaluate her motivations, shifting from striving for an undefeated Triple Crown to focusing on racing in the Spring Tenno Sho and becoming a role model for her rival and friend, Mejiro McQueen. She demonstrates resilience by overcoming multiple injuries and setbacks, culminating in a mature and determined outlook. Her relationship with McQueen evolves from rivalry to mutual inspiration, with both supporting each other through challenges. Her signature "Teio Step" originates from her real-life counterpart's distinctive paddock gait, adapted into a playful pre-race ritual. Additional background notes include her childhood nickname "Ruler of the Beach," her fear of doctors, and her exceptional flexibility, holding a class record in sit-and-reach exercises. She maintains a close bond with Symboli Rudolf, reflecting the real-life sire relationship. In spin-offs like *Umayon 2*, her lighter traits are emphasized through comedic vignettes, such as restlessly bouncing on couches or engaging in nonsensical activities. She also appears in *Uma Musume: Pretty Derby - BNW no Chikai*. Her overarching narrative emphasizes adaptability and perseverance, transforming from a talent-reliant racer into a symbol of enduring determination and cementing her legacy within the franchise's thematic focus on growth.