Leona Kozuki (Fumiko Orikasa), also known as the Third Phantom and the Bride of Phantom, is a hidden villainess of Opera House The Third Murder. She was the youngest member of the Nomad Uprising theater troupe and the most beautiful and talented member, playing the role of Christine.
Prior to the event, Leona was in a romantic relationship with Eiji Kiryu, another troupe member whose face was disfigured by fire after saving Leona from an accident. Though Leona never minded his appearance and continued to respect and love him, the incident resulted in Eiji dropping of from all the plays and ceasing to perform, only to perform one last time as the Phantom at Leona's behest.