Kanon Toudou is a Prism Star and one of the members of Serenon, along with her best friend, Serena Jounouchi, the Prism Show duet, a member of the Serenon manzai duet as the "tsukkomi" (lit. jab) of the group, and Callings member Hibiki's younger sister. She is quite obsessed with her brother, not letting any woman get near him. This is exactly why she has such a problem with Rizumu, even secretly following Rizumu and Hibiki back to her home with Serena to stop Hibiki from getting close to Rizumu. She also ripped open a letter Rizumu wrote to him right in front of him and read it. Rizumu and Kanon, obviously, bump heads a lot.