Leo Tsukinaga

Unit: Knights
Age: 17
Birthday: May 5
Club: Archery Club

Leo is a leader from unit Knights. He is a genius composer who has created numerous songs. He greatly admires his little sister and uses her as inspiration for his songs. During his second year, he experienced a slump and depression that led him to leave the academy temporarily. In the spring of his third year, he returned and declared himself "King" and led Knights. When he graduated from the academy, he gave up his dreams and ambitions, handing over the throne of "King" to Tsukasa.

In the Checkmate story, Leo experienced depression and severe mental damage because he felt used. He believed that people only loved his songs and not him. He even believed that Izumi, the only person who sided with him, also used him and saw him as a stepping stone for his career. Because of this, a rift occurred in the Knights that almost led to its disbandment. This problem also caused Leo to lock himself in his room and continue to hurt himself because he believed that his songs could not save others, not even himself.