Mutsuki Takamiya is a supporting character from the visual novel game Otome wa Boku ni Koishiteru: Trinkle Stars.
Mutsuki is the current acting principal of St. Serawl Girls' Academy, a science teacher, and a part of the undercover security of one Orihime Kazahaya. He is also Hisoka Yuuki's self-defense instructor and friend.
Mutsuki has short purple hair and garnet eyes. He is always shown wearing a purple turtleneck, a black skirt, a lab coat, and black flat shoes. There is only one instance where he is seen without his lab coat.
Reason for Cross-dressing
As an undercover bodyguard, he has to blend in with the environment, hence the cross-dressing.