Leo Saionji is a Prism Star and a student of Kakyoin Academy at Edel Rose. He has a small build, short neck-length pink hair, and fuchsia eyes, and his appearance and mannerisms are often described as feminine. Timid and slightly clumsy by nature, he possesses a gentle heart and a fondness for cute things. He is always kind and soft-spoken, and he looks up to Yukinojo Tachibana as an older brother and mentor, addressing him with deep respect. Leo’s primary motivation for enrolling at Edel Rose is his desire to become more manly and confident someday. He works hard alongside Yukinojo in training, though his growth is gradual; for instance, he still ties his tie like a ribbon. In the story of King of Prism: Pride the Hero, Leo appears as a supporting character among the new generation of Edel Rose students. He is notably skilled at sewing and personally tailored a stage costume for fellow student Taiga Kougami during the Prism King Cup. Over the course of the series, his gentle personality and earnest efforts contribute to the group dynamic, and he eventually becomes part of the unit Septentrion. His notable abilities include his craftsmanship in costume design and his prism show performances, which reflect his cute and heartfelt style.