Tsurumaru Tsuyoshi is an energetic and positive horse girl, despite a constitution prone to breakdowns that often lags behind her determined spirit. She possesses short light brown hair styled in a bobcut, featuring a distinctive white streak in the center of her bangs. Her appearance includes a crane-shaped wing hair ornament on her right side and an orange circle symbol, paired with a zigzag hair clip on her left bang. She has pink eyes, stands 160 cm tall, and has body measurements of B85, W58, H86. Her background is marked by physical fragility and perseverance. Repeated health setbacks, including dysemia and bone aneurysms, delayed her racing debut and forced extended rests throughout her career. Despite these challenges, she achieved notable victories in the Asahi Challenge Cup and the Kyoto Dai Shoten, defeating rivals like Special Week, T.M. Opera O, and Mejiro Bright. A tendon injury during the Arima Kinen ended her racing career in 2000, leading to retirement. Post-retirement, she worked as a lead horse at Kyoto Racecourse until another injury in 2007, after which she relocated to Yoshino Farm in Miyazaki. She resides there under care funded by a dedicated support initiative. In media portrayals, she aspires to become a "Triple Crown Horse Girl," frequently pushing herself to physical extremes during training and races, resulting in collapses or health relapses. Her storyline includes a significant race confrontation with Special Week, where she expressed frustration over perceived lack of effort, though they later reconciled. A recurring "Frozen Wings" condition in training scenarios imposes stat reductions until late in her classic year, reflecting her real-life challenges. Within spin-offs like "Uma Yuru," she features in dedicated episodes such as "Tsuyoshi, Build Up!," where a temporary boost from experimental medicine humorously allows her to overcome physical limitations. These appearances emphasize her comedic tendency to overexert, often culminating in coughing fits or mishaps. Her relationships include admiration for Symboli Rudolf, a rivalry-turned-mutual respect with Special Week, and a close bond with her roommate Mejiro Bright, who affectionately calls her "Tsuruchan-sama." She maintains friendships with contemporaries like Tokai Teio and others from her generation. Trivia notes include her pride in being asked for directions, her meticulous morning styling of her white bangs, and family traditions of sending fruit. Her tail requires immediate drying post-wash to prevent illness, and she enjoys creating health smoothies, albeit with poor taste results.