Yuki is the Rat of the zodiac. He is known as "The Prince" at school and he's very pretty and refined. Yuki has many admirers at school, some say half of the student body, but has a hard time being social; he wishes that he could be friends with other people, rather than being admired and praised from afar.

Yuki has suffered a traumatic childhood at the hands of Akito, the head of the Sohma clan. Akito locked him up and mentally tortured him. In effect, Yuki has a somewhat low sense of worth and a claustrophobic fear. With Tohru's help, however, Yuki is gradually able to loosen up.

Yuki's fangirls hate it when Yuki gets closer to Tohru, and use harassment to try to drive her away. They claim they are trying to "protect" Yuki from Tohru, but the truth is, they are merely bombarding him with one-sided love and adoration; Tohru's the one protecting Yuki. It was revealed that Yuki was the one who saved Tohru and brought her back to her mother when she was young and had gotten lost; Tohru has never forgotten that memory and keeps the hat (which actually belongs to Kyo) that Yuki gave to her. For that, Yuki always has a deep respect and love for Tohru for actually "needing" him.

Generally quiet and polite, Yuki is an amazing martial artist who enjoys gardening. He has a garden in a small patch of forest near the walkway leading to Shigure's house which he and Tohru call their "secret base".