Yui is a cheerful and outgoing girl. Even when she's sad or upset, she has a smile on her face. She has said that she always wants to fit in, and that disagreeing with friends brings her anxiety. Hachiman initially describes her as the typical good looking, dumb, popular type, but is later proven to be wrong. While she can be naive, she's overall intelligent, and her social skills are her strongest point. She has a friendly attitude to mostly everyone around her and usually ends up befriending them. She is not all deterred by those who refuse her kindness such as Hachiman Hikigaya and Yukino Yukinoshita, even after both criticized her. She has nicknamed the two, "Hikki" and "Yukinon" respectively, which both dislike at first but eventually accept as normal. She has nicknames for almost everyone and even asks for people to give her her own nickname during her birthday party. She is an expert at reading the mood and adjusting herself to it. Because of this, she often hides her true opinion and states what others want to hear in order for things to go smoothly. Yui's very sensitive to the politics of the class. She's known as the "glue" of Hayato's clique, as she is always the one providing the energy and friendliness. She dislikes being a disturbance. She admires both Yukino and Hachiman for being blunt and their willingness to share their opinions no matter how harsh they may be. Yui has stated their honesty, straight forwardness, and independence are the reasons she joined the Service Club. After her experience with the Service Club, she was able to speak her mind a bit more, showing how much she developed socially. Due to Yui's personality and appearance, she gets hit on by the male student population, but gets away by using Yumiko as an escape route.[1] Though Yui is both cute and social, she is mentioned having no boyfriend as most boys believe that they can't land a date with her, choosing to give up as stated by Tobe. She can be very determined when she sets her mind to something, demonstrated when she decides to run for student council, as well as when she forces the events of Volume 11 to happen. In her guidance counseling survey, Yui wrote she wants to get along with everyone and wished to be friends with everyone even after graduating.