Momo Sohma is Momiji Sohma's younger sister. During the events of Fruits Basket, she is unaware about the curse, or that Momiji is her older brother. She reappears in the sequel, Fruits Basket Another, now an adult.
Momo is small, having blonde hair and golden eyes. She bears a resemblance to her mother, which Momiji remarks on, though it has been pointed out that she resembles Momiji as well.
Momo is shy and quiet, and almost never speaks. According to Momiji, she can't speak Japanese very well so her words come out like a mumble. She wishes that Momiji could be her brother, although she doesn't know that he already is. She took violin lessons, like Momiji, but Momiji's father had to withdraw him from lessons because Momo was asking about Momiji.
Role in Story
Before Summer Vacation
While Momiji explained his past to Tohru Honda in Volume 4, Momo and their mother appeared in the office building. This was Tohru's first "meeting" with Momo.
After Summer Vacation
In volume 13, Tohru Honda had to go to the main house, who had proceeded to wander around the outside due to nervousness.
While doing so, she found Momo, who said she knew a secret way in. They went into a tunnel in the wall that led to Momiji's backyard. Momo told Tohru that she would come to watch Momiji play violin. Momo explained to Tohru about how she told her mother that Momiji looked just like her. She asked if Tohru would ask Momiji if he wanted to be Momo's brother. Tohru went in and asked Momiji, prompting Momiji to cry from happiness.
Fruits Basket Another
Momo reappears in the sequel, now an adult.
- Although it is initially stated that Momo is in her second year of elementary school, Momiji later mentions that his father is troubled as she states her interest in attending Kaibara High School (likely in pursuit of Momiji). He states his idea of intentionally repeating a year so that they can attend the same school. However, this would suggest that Momo is actually only 3 years younger than Momiji, making her 11 or 12 at the very start of the series rather than 7 or 8.