Nemuri Kayama is a Pro Hero and faculty member at U.A. High School, who teaches Modern Hero Art History. Nemuri is a very playful and flirtatious person with an unpredictably serious and temperamental side to her. She gets angry whenever someone interrupts her or insults her, and, when it comes to insults, she is especially sensitive about her age. Nemuri has no shame for dressing or acting sexually in front of young students and appears to act on whims most of the time. Despite her flirtatious personality, Nemuri is intelligent, perceptive, and articulate. As shown during her time before working at U.A., Nemuri is capable of putting her lascivious hero persona to one side when off duty. As a civilian, she is perfectly capable of presenting herself as an ordinary woman and displays a caring, thoughtful, and even motherly side toward others. While acting bawdy and coming off as a hero who enjoys her fame derived from her beauty and sex appeal, Nemuri is willing to fight and put her life on the front lines.