Appearance: Nemuri was a tall, curvaceous woman with sky blue eyes that tilted downward in the center and were framed by a set of rather long eyelashes. She had long, thick, 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 adult Hero Costume was remarkably 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 light purple, 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 stiletto knee-boots. She had a small red mask outlining her eyes, a pair of handcuffs on both her wrists, and was often seen carrying a flogger-style whip. The white bodysuit was made of thin material that is easily tearable, so she could more easily use her Quirk. Nemuri had stated in an interview that she was trying varied materials to find out what works while adhering to costume regulations. Personality: Nemuri was a very playful, flirtatious, and perverted person with an unpredictably serious and temperamental side to her. She got angry whenever someone interrupted her or insulted her, and, when it came to insults, she was especially sensitive about her age. While she deliberately adopted an "R-Rated" dominatrix motif for her Pro Hero persona, she maintained clear professional boundaries as an educator and referee. Nemuri held a deep admiration for the pure, uncorrupted spirit of youth. This was highlighted during the U.A. Sports Festival when she enthusiastically accepted Mashirao Ojiro and Nirengeki Shoda's requests to withdraw from the tournament. Rather than being driven by inappropriate desires (which could be wrongfully assumed due to how in the English dub she said their naivety literally "turned her on"), her decision was rooted in a profound appreciation for their earnest integrity and "youthful talk," validating their mature sportsmanship. She displayed this same non-sexual excitement toward Eijiro Kirishima and Tetsutetsu Tetsutetsu's display of chivalry later in the tournament. 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 could be impressed with those who resort to genius plans, as Minoru amazed her using tactical thinking to defeat her by luring her out and leaving her trapped in place before passing the gate. Despite her flirtatious and perverted 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 liked dressing the way she did for attention, and given her frequent posing while on TV or addressing the media, this in itself was quite likely. As shown during her time prior to working at U.A., Nemuri was capable of putting her lascivious Hero persona to one side when off-duty. As a civilian, she was perfectly capable of presenting herself as an ordinary woman and displayed a caring, thoughtful, and even motherly side towards others. This was shown with her friendship and care towards Pop☆Step and her empathizing with Hina, despite the former's vigilantism and the latter's wrongdoings. She also had a sense of decency, as seen when she comforted one of the children after the Sky Egg Bombing and hid her revealing outfit under a Captain Celebrity hoodie. While she tended to act bawdy and came off as a Hero who enjoyed the fame derived from her beauty and sex appeal, Nemuri was willing to fight and put her life on the front lines during the Paranormal Liberation War, and demonstrated that, despite her excessive vanity, she held the true bravery and spirit of a Hero. Similar to All Might and Shota Aizawa, she also believed in her students and their capabilities, acknowledging that all of them have what it takes to become great Heroes in the future. Quirk: Nemuri's Quirk(Somnambulist) 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.