Yukinoshita Yukino♀

Yukino is a student in class 2J and the leader of the service club, of which she is the sole member until Hachiman joins. She is from a wealthy family, smart, beautiful, and is nicknamed the "Ice-cold Beauty" for her icy demeanor. Due to her popularity with boys, she is envied by most girls, and is disgusted by their attitude to undermine her instead of improving themselves, thus she has few friends.

Yukino has a twisted sense of "noblesse oblige", and believes that it is the duty of the exceptional (in other words, herself) to help the "lost lambs" of the world. Her personality often leads her to be disgusted at the naivete of others, particularly Yui's, and she does not hesitate to show it. Despite this, Yui still affectionately refers to her "Yukinon". After the first cultural festival, while she still does not recognize Hachiman as a friend, she recognizes him as an acquaintance.

[From Wikipedia]