Leo is the formal leader and member of the idol unit "Knights", alongside Tsukasa, Izumi, Arashi and Ritsu. He's close friends with Izumi who always scolds but takes care of Leo. He has a chaotic and unpredictable nature but is friendly. He sometimes gets inspiration from random things and immediately writes them down anywhere he can find. He calls himself a genius because of that. He believes that aliens are real and claims they visited him once. He gets excited when he sees an alien.