Yuki Sohma, aged 17, is the rat of the Chinese zodiac and younger brother of Ayame. Yuki is depicted as an attractive, reserved, and accomplished young man with many admirers, but who finds being friendly difficult. When Yuki was young, his mother gave control of him to Akito Sohma, who kept him separated from the rest of the zodiac and convinced him no one liked him; because of this, Yuki has low self-esteem and feels isolated. He is known as "Prince Yuki" and "Prince Charming" at school, where he has a fan club headed by Motoko Minagawa that tries to "protect" him from other admirers, with the result that Yuki is further isolated, and he is pressured by his popularity to become president of the student council despite his misgivings. Yuki, however, wishes that he could be with people as friends, rather than be admired from afar, and envies both Kyo Sohma's and Kakeru Manabe's easy ways with others. Yuki is touched when, faced with the prospect of having her memory of the Sohma family secret erased, Tohru Honda asks that he remain her friend, which no one had asked him before. With Tohru's help Yuki is gradually able to "open the lid" of his feelings, and the summer after she begins living in Shigure's house, Yuki admits to himself that he loves her.

When Yuki was around six or seven years old, he ran away from Akito. Yuki has always had fond feelings for Tohru for actually "needing" him. However, he later admits to Manabe that he was looking for a mother-figure and found her in Tohru. As the rat, Yuki despises the current cat, Kyo, despite envying him, and is contemptuous of his attempts to defeat him. Even when he realizes the true nature of his feelings for Tohru, Yuki is uncomfortable when he recognizes her and Kyo's growing feelings for each other. Yuki becomes attracted to Machi Kuragi, a student council treasurer who also had a traumatic childhood, and falls in love with her. When he knows that Kyo will be confessing his love to Tohru, Yuki meets with Machi and is with her when his curse lifts, whereupon the first thing he does is embrace her. In the last chapter, he gives Machi a key to his new apartment, where he will be living as he attends university.

Informations Source: Wikipedia