Michelle My Baby is an American horse girl who appears in the anime Uma Musume: Cinderella Gray as a representative of the United States during the Japan Cup arc. She is one of two American competitors in the race, the other being Obey Your Master. Michelle My Baby is known by the nickname American Giant due to her striking height; at 195 centimeters, she is the tallest character in the Umamusume franchise. She has a cheerful and friendly personality, which contrasts with her imposing physical build. Her appearance includes short brown hair, yellow eyes, and the typical horse ears and tail of a horse girl.

Her motivation for traveling to Japan is to compete in the Japan Cup and demonstrate the racing prowess she has developed through her career in America. Her signature racing style relies heavily on her formidable physique, using her size and strength to overpower opponents, a strategy that has brought her success in American races. In the story, she engages in a direct standoff with the protagonist Oguri Cap during the Japan Cup, serving as a major foreign challenger and highlighting the international scale of the competition. Beyond that rivalry, her primary relationship is with her fellow American entry Obey Your Master, with whom she shares the experience of representing their home country abroad. Michelle My Baby does not undergo significant personal development within the narrative; her role is that of a strong, friendly outsider who brings a physical dimension to the contest and reinforces the global nature of the racing world.