Masami Komiyama is a supporting character in the manga and anime series Uma Musume: Cinderella Gray. She is a human adult female who works as a trainer affiliated with Central Tracen Academy, and she is specifically assigned to train the horse girl Tamamo Cross. Her real-world motif is the jockey Katsumi Minai; her given name can also be read as Katsumi, and her birthday is January 17th, matching that of the historical figure. Masami first met Tamamo Cross when a landlord asked her to watch over the then-young horse girl as she ran. This early encounter led to her becoming Tamamo's dedicated trainer. In appearance, Masami is a young woman with long hair tied back, revealing a prominent forehead with sidelocks. She is given the nickname Komi-chan by Tamamo, indicating a close and familiar bond between them. As a trainer, her primary motivations center on developing Tamamo's racing talent and guiding her career. While specific personality traits and personal development are not extensively detailed in available material, she is shown to be a supportive and capable figure within the story, playing a key supporting role in Tamamo Cross's journey. Her notable abilities include her expertise in training methods and her understanding of competitive racing.