Onemine has two moles on her face, one under her left eye and on the right side of her lower lip. She sports medium-length brown hair which she ties up usually and long bangs framing her face with a parting at the center. She is often wearing the standard female school uniform. She is an extremely kind and mature Senpai at the school, who cares about her Kouhais and looks out for them. She has quite a serious apperance, but she is nice and helpful. She likes the PE teacher despite their flaws.