Riku Kisaragi

He is a playboy who discovers Rin's secret. While sleeping in the empty drama room, he accidentally sees Ageha transform back into Rin. He cross dresses as Ageha assistant and always helps out Rin however he can, even getting suspended once to save someone in trouble with a teacher because she had make-up on because he knew Rin was going to step in and that would get her in trouble. As a running gag, Ageha's clients often mistake him for the legendary make-over artist. (Source: Wikipedia)