Nemuri Kayama (
Nemuri is a tall, curvaceous and attractive woman with sky blue eyes, which tilt downwards in the center, framed by a set of rather long eyelashes. She has abundant spiky dark purple hair of varying lengths, the longest clumps reaching down below her waist, which somewhat resembles a pine tree in shape, and her chin-length bangs are split into three sections, two swept to the sides and one over her face, going diagonally down to the left between her eyes. She has a mole that is on the left side of her face, underneath her eye.
Her hero costume is very similar to one of a traditional dominatrix. She wears a black leather breastless leotard over a white bodysuit (flesh-colored in the manga), which emphasizes her breasts, body and legs, the leotard possessing red gemstone-like accessories in a vertical pattern from the collar to the midriff, along with translucent black thigh-high stockings and black knee-boots. She has a small mask outlining her eyes, a handcuff on each wrist, and a utility belt around her hips, also sporting a red domino mask and often seen carrying a flogger-style whip. The white material of her costume is thin and easily rippable so she can more easily use her Quirk, and she has stated in an interview that she is trying different materials to find out what works while adhering to regulations.
Midnight is a very playful and flirtatious person with a serious and angry side to her. She gets angry whenever someone interrupts her or when they mention her age and insult her.
Midnight has no shame for dressing or acting sexually in front of young students and appears to act on whims most of the time. When she accepted Mashirao Ojiro and Nirengeki Shoda’s request to resign from the tournament, she commented that their naivety “turned her on”. She was also very excited to see the chivalry displayed by Eijiro Kirishima during the tournament when he shook Tetsutetsu Tetsutetsu’s hand.
When Class 1-A needed to decide on code names for their internship, Midnight displayed her willingness to help her students by making sure they chose names that would represent themselves well. During the Final Exams, Midnight admitted to Minoru Mineta that she has a sadistic side that enjoys dominating others. She can be impressed with those who resort to genius plans, as she was amazed by Minoru using tactical thinking to defeat her by leaving her in place before passing the gate.
Despite her flirtatious personality, Midnight is intelligent, perceptive, and articulate, as seen when she logically explained the reasoning behind some hero's having revealing costumes to make full use of their quirks, and how that lead to "sexy" costumes and how she single handedly instituted the costume regulations, though Mt. Lady replied that it's because she likes dressing way she does. Her love of "youth" is also a reason she gets angry when someone mentions her age or calls her old.
Whip: Fitting her dominatrix theme, Midnight wields a flogger-style whip in combat and she is skilled in wielding it. She also used a bullwhip-style whip during the First Term Final Exam.