Isuzu Sohma, 17-18 who is also called Rin, is the Horse of the Chinese Zodiac. She is often called Rin by a few members of the family because 'suzu' translates to 'small bell' in Japanese, and 'Rin' is the sound a small bell makes.

Apparently, she and Hatsuharu used to have a close sexual relationship together, until Akito found out about it and hurt Rin severely, causing her to be admitted to the hospital for some time. When Hatsuharu visited her while she was in the hospital, Rin broke up with him, without giving any reason why. It is later known that she didn't want him to be hurt by Akito if they continued the relationship.

Rin's character is somewhat cold and angst-ridden. She thinks of Tohru Honda as an annoyance to the Sohmas, but eventually warms up to her little by little because of the kindness Tohru gives in return. She only appears in the manga, not in the anime.

She is famous for her tough and independent nature and her darkly exquisite sexiness within the Sohma family. Also, she is known for a trait of her zodiac animal: sheer stubbornness and independence. Anyone who usually tries to go against those feelings get a taste of Rin's high-heel boots.