Momoka Yashiro is a supporting character in Gundam Build Divers. She is a cheerful and energetic student who becomes involved with the Build Divers team and the world of Gunpla battles. Momoka often adds a light, friendly presence to the series, helping to balance its action and competition with everyday school-life moments. Her role is mainly to support the cast and contribute to the social dynamics around the main characters, rather than to serve as a major combat-focused player.