Mutsuki Kamijo is a main character in the tokusatsu series Kamen Rider Blade. He becomes Kamen Rider Leangle after being chosen by the Leangle Buckle, which he initially struggles to control due to its sinister will. Mutsuki starts as a troubled high school student and his journey revolves around overcoming the Buckle's influence, maturing through his trials, and ultimately choosing his own path. His growth and eventual camaraderie with the other Riders are central to his role in the story.