Hayase Nagatoro

Nagatoro is portrayed as a very energetic, cheerful, and sarcastic individual, also displaying flirtatious and sadistic tendencies. She enjoys teasing her Senpai and considers it a fun endeavor. Initially, her teasing was indeed "sadistic," but she admitted she crossed the line and apologized. She continues her teasing, but makes it less offensive. Nagatoro's personality can be described as tsundere, despite her denial of her feelings for Senpai. She is also extremely possessive of him, completely refusing to let others bully him or even touch him, but allowing others to do so herself. She becomes jealous whenever he starts spending time with other girls. She is extremely worried about her Senpai and is angered by his lack of self-confidence. Nagatoro loves cats. He's insecure about the size of his breasts. He can act yandere when his senpai is with other girls.

Nagatoro is an attractive, petite, and short high school student with long, straight black hair pinned to the right side with a pair of white clips. She has tanned skin with noticeable—though sometimes uneven—stripes from her swimsuit and large, expressive amber-brown eyes. She paints her nails red, has a metal piercing on the top of her right ear, and both her earlobes are pierced, though she rarely wears earrings. Nagatoro is slender, athletic, and very flexible, with a modest bust size, which she often expresses shame about, despite the fact that—given her height and build—it's quite average. Nagatoro is rarely seen without a sadistic, cheeky smirk, which often reveals her very prominent fangs and causes the pupil of one eye to dilate whenever she smiles. She usually wears a school uniform, which consists of a white button-down shirt (the sleeves and collar of which she never fastens) and a dark blue skirt, accessorized with sneakers and no socks.