YUKI( Because Yuki is a male-to-female transgender woman, Gender Neutral Pronouns are used when referring to hir perceived birth gender. Female pronouns are used when she is presenting as an adult, mature woman. See this article. )
Hiroyuki, usually referred to as Yuki, is a tall and attractive trans woman living with her boyfriend Shiina.
A upbeat and friendly person, she is seen to be very supportive towards Nitori Shuuichi & Yoshino Takatsuki , in both their well being, as well as with their struggling with internal feelings on the subjects of being transgender and dressing as their correct gender and being out in public. She also prods both Shuichi and Yoshino to be a shouji ai couple, and often sees them as the most compatible for one another. Even though she had a rough younger life dealing with being a male-to-female transgender person, often being teased, bullied and/or discriminated, and being forced into sissyfication and other humiliating actions, she is relatively upbeat and looks back without regret for the transitioning decisions she has made. She was also supported by Shiina during her high school years, which greatly helped her.
She is not mentioned often in the anime, only in passing as in cameo appearances. She first is shown to give Yoshino Takatsuki a male student uniform as a gift, and teasing Yoshino about her and Shuichi having a supposed relationship. She is not shown many times socially, only when Yoshino and Shuichi go to visit her to talk to her about this and that.
Yuki takes an early interest in Yoshino when she believes Yoshino to have been born as a boy, though she remains on good terms with Yoshino even after learning of Yoshino's perceived birth sex of female, and gives Shuichi and Yoshino helpful advice when they are troubled. Despite the differences between their situations, Yuki sees a lot of herself in Shuichi. When Yuki was growing up, Shiina was the only friend who stood by the young Hiroyuki, as ze was called then, while girls teased hir and the boys bullied hir to change her gender expression back to hir birth gender of perceived male. Yuki always keeps up a positive attitude, and now runs a gay bar. Since her transition, she has not been on good terms with her parents, who run a uniform store.