Nemuri Kayama, better known as the R-Rated Pro Hero Midnight, stands tall and curvaceous, her long, spiky dark purple hair cascading past her waist. Her sky blue eyes, framed by long lashes, tilt downward at the center, and a small beauty mark rests below her left eye. She paints her nails a striking red. As a U.A. High teacher, she balances her flirtatious, perverted nature with clear professional boundaries, especially during official events like the Sports Festival. Despite her playful demeanor, she has a serious, temperamental side and is sensitive about her age. She deeply admires the pure spirit of youth and proudly embraces her dominatrix-themed hero persona.