Mizore Shirayuki is a yuki-onna ("snow fairy" in the English manga ). Frequently seen with a lollipop in her mouth (yuki-onna are vulnerable to warm climates; doing so keeps their bodies cool), Mizore returns to school after a delayed absence and was first portrayed as a lonely, somewhat depressed, and misunderstood girl. She becomes infatuated with Tsukune, going so far as to create her own journal/scrapbook with all of his newspaper articles. In the past, she confessed her love to a teacher until he began taking advantage of her, freezing him as a result. With the incident and rumors spreading about her, Mizore made it hard for herself to trust anyone, but took a liking to Tsukune, believing he was just as miserable as she was. She eventually regains her sense of trust after Tsukune intervenes when the same teacher returns to kill her. Unfortunately, this leads Mizore to stalk Tsukune on a daily basis (from around 340 spying locations, according to her ). In her first appearance, she sports long hair, but cuts it short following the incident.
Keeping in line with her kind, Mizore has the ability to control snow and ice at will, and while doing so, shapes claws of ice around her hands (her hair often becomes ice on rare occasions). She can also make almost perfect copies (albeit fragile) of herself and others with it as well, often used as decoys or reinforcements in the manga and she is very powerful when she uses it. Her ice claws become more powerful after her training with Gin and obtains the ability to freeze any body of water around her.
A running gag in the series is that Mizore always appears unexpectedly in the oddest locations (under tables, behind doors, the ceiling, bushes, even in the bathroom), and throws ice-based projectiles to disrupt any sort of tender moment Tsukune is having with any other girl. Mizore's mother is Tsurara Shirayuki, who appears during the start of the school festival under the belief that Tsukune is her daughter's boyfriend, while her unnamed father appears in the second anime adaptation. Her family name translates to "White Snow" and her given name translates to "Sleet", in reference to her yōkai powers.