Nemuri Kayama, known as Midnight, is a 31-year-old professional hero and a former teacher at U.A. High School. She is confident, charismatic, intelligent, and possesses a great sense of humor. While often appearing relaxed, flirty, and provocative with adults, she is a responsible hero who takes the safety of her students and her duties very seriously. Thanks to her Quirk, Somnambulist, she can release an aroma that induces sleep in those who inhale it. She is strategic in combat and knows how to remain calm even in dangerous situations.