With so much time left, I thought I'd park myself at the gate... but, well, taking that approach is just no fun at all... Because watching you run and shriek like a baby... makes the sadist in me ache for a chance to play.
Nemuri Kayama (香山睡,Kayama Nemuri?), also known as the R-Rated Hero: Midnight (18禁ヒーロー ミッドナイト,Jū-hachi-kin Hīrō Middonaito?), was a Pro Hero and faculty member at U.A. High School, who taught Modern Hero Art History.
Nemuri was a tall, curvaceous woman with sky blue eyes, which tilted downwards in the center; framed by a set of rather long eyelashes. She had abundant spiky dark purple hair which was made up of layers of varying lengths, the longest ones reaching down below her waist. Her chin-length bangs were split into three sections; two swept to the sides and one over her face, going diagonally down to the left between her eyes. She also had a small beauty mark below her left eye, as well as red-painted nails.
Her hero costume was very similar to one of a traditional dominatrix. She wore a breastless, black leather leotard—similar in style to a corset—over a thin, skin-tight white bodysuit (flesh-colored in the manga), which accentuated her voluptuous figure. The center strip of her leotard was embellished with red gemstone-like accessories in a vertical pattern, extending from her collar to her midriff. She also wore translucent, black, thigh-high garter stockings, which were attached to a burgundy utility belt decorated with gold studs around her hips, a matching pentagonal buckle in its center, and black knee-boots. She had a small red mask outlining her eyes, and a handcuff on each wrist. She was often seen carrying a flogger-style whip. The white bodysuit was made of thin material that is easily rippable so she could more easily use her Quirk. Nemuri had stated in an interview that she was trying different materials to find out what works while adhering to costume regulations.
During her years at U.A., Nemuri's original costume was much more revealing. Her breasts were censored by a black protective plate, and wore a dog collar. She wore only undergarments, which were covered with a utility belt that held her whip. She was otherwise completely bare aside for an unbuttoned, high-collared trench coat. She also had large angular shades, different from the mask she wears now.
Nemuri was a very playful and flirtatious person with an unpredictably serious and temperamental side to her. She got angry whenever someone interrupted her or when they insulted her, and, when it came to insults, she was especially sensitive about her age.
Nemuri had no shame for dressing or acting sexually in front of young students and appeared 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. Her love of "youth" was also a reason she got angry when someone mentioned her age or calls her old.
When Class 1-A needed to decide on code names for their internship, Nemuri displayed her willingness to help her students by making sure they chose names that would represent themselves well. During the First Term Final Exams, Nemuri admitted to Minoru Mineta that she has a sadistic side and 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, Nemuri was intelligent, perceptive, and articulate. For instance, in an interview, she logically explained the reasoning behind some heroes having revealing costumes to make full use of their Quirks, thus leading to "sexy" costumes, and how her previous "scandalous" costumes single-handedly led to the institution of hero costume regulations. However, in response, Mt. Lady commented that Nemuri simply likes dressing the way she does for attention.
Modern Art Expertise: Nemuri taught high school modern art history.
Somnambulist (眠り香,Nemuriga?): Nemuri's Quirk allowed her to put nearby people to sleep by exuding a sleep-inducing aroma from her body. Her Quirk worked better on males than females.
Nemuri's stats, according to the Ultra Archive Book
Nemuri's stats, according to the Ultra Analysis Book
Whips of Love: Fitting her dominatrix theme, Midnight wielded a flogger-style whip in combat and she was skilled in wielding it. She also used a bullwhip-style whip during the First Term Final Exam.
Feather Fan: Midnight used a pair of hand fans in combat to better spread her sleep-inducing fragrance.
Ultra Thin Fabric Suit: Nemuri could only spread her sleep-inducing aroma from exposed skin. The law states that a hero costume can't expose too much skin, so to make up for this hindrance, she wore a suit made of a material that she could easily rip through.
Nemuri was originally planned to be Class 1-A's homeroom teacher, but she was later replaced with Shota Aizawa since Horikoshi wanted 1-A's teacher to be someone willing to get sharp-tongued with the kids.
Nemuri's Japanese voice actress, Akeno Watanabe, also voices Izuku Midoriya as a child.
Nemuri's first hero costume was stated to be the only reason why regulations were made to limit the amount of skin that can be exposed for hero costumes.
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