Nemuri Kayama, alias Midnight, serves as a Pro Hero and U.A. High School’s Modern Hero Art History instructor. A U.A. alumna, she forged enduring bonds with classmates Shota Aizawa, Hizashi Yamada, and the late Oboro Shirakumo. Her early heroics were shaped by an internship under the theatric His Purple Highness, blending empathy with whimsy—nurturing a stray kitten rescued by Aizawa and championing marginalized voices. Midnight’s striking presence combines a statuesque silhouette, piercing sky-blue eyes, and cascading dark purple hair. Her dominatrix-inspired costume—a black leather leotard layered over a skin-exposing bodysuit—facilitates her Quirk’s activation via exposed flesh, accented by translucent stockings, a burgundy utility belt, and a flogger whip. As a student, her bold attire spurred public discourse, catalyzing stricter costume guidelines for aspiring heroes. Charismatic yet shrewd, Midnight oscillates between coy teasing and incisive professionalism. She relishes playful domination in training but bristles at jabs about her age, fiercely advocating for youthful vigor. Her mentorship extends from whimsically tormenting Minoru Mineta to earnestly guiding Momo Yaoyorozu, reflecting her dual commitment to nurturing potential and tactical excellence. Her Quirk, Somnambulist, releases a soporific aroma from her skin, disproportionately affecting males. She amplifies its range using handheld fans and whip-assisted dispersal. In combat, her technical mastery shines, complemented by agile reflexes and sharp tactical judgment. During the Paranormal Liberation War, Midnight spearheaded efforts to incapacitate Gigantomachia. Isolated by Mr. Compress’s ambush, she directed students to administer sedatives before debris inflicted critical injuries. A masked foe later overpowered her, and her death—witnessed by U.A. pupils—forced a stark reckoning with heroism’s mortal stakes. Midnight’s legacy persists through reformed costume policies, mentees like Momo, and unrealized early concepts casting her as Class 1-A’s homeroom teacher. Her name, merging “sleep,” “fragrance,” and “mountain” kanji, mirrors her essence. Beyond battlefields, she championed pop idol outreach and covert missions, embodying a multifaceted dedication to societal uplift.