Mr. C.B. is a supporting character in the anime Uma Musume: Cinderella Gray. She is a student at Tracen Academy and is recognized as the third horse girl in Umamusume history to achieve the Triple Crown, a feat that cements her status as a living legend. Her background includes parents who are a trainer and a former Umamusume trainee, and she grew up placing greater value on freedom and fun than on racing titles or public recognition. She lives alone and is known for her free-spirited, unconventional approach to racing, often described as marching to the beat of her own drum with unwavering confidence. This confidence and charismatic presence naturally attract others to her. In terms of appearance, she has long black-brown hair that flows gracefully yet with wild strands, a white silk hat decorated with a CB badge, and high-heeled Mary Janes, with her outfit evoking early-to-mid 1900s fashion.

Her personality is cheerful and bold, with a lighthearted yet commanding air. She loves the sense of freedom that races bring her and is ambitious, never backing down from a challenge. Her motivations center on enjoying the act of running itself rather than solely pursuing victory, which sets her apart from more driven rivals. In the story, she appears as a supporting character, primarily at Tracen Academy, and her presence influences other horse girls through her example rather than direct instruction. Key relationships include friendships with Maruzensky and Symboli Rudolf, and she often teases Katsuragi Ace. Her development is tied to her role as a mentor figure to Inari One in the manga, helping the latter find confidence in her own running style. Notable abilities include her unconventional racing style that defies expectations, and her ability to inspire and shift the perspectives of those around her simply through her free-spirited approach to competition.