Sara Usui (碓氷 沙羅 Usui Sara) is the daughter of Misaki Ayuzawa and Takumi Usui. She is one of the main protagonist along with her younger brother, Rui in the one-shot manga Yuki Ochimura ni Ojou-sama!.
Sara is a young girl with blond hair and green eyes, which was most likely inherited from her father, Takumi Usui.
Sara is a cheerful girl that loves excitement, she enjoys solving mysteries of anything unique and interesting but she doesn't like getting involved with anything including fantasy and romance. She also likes to interacts with whom or whatever she finds intresting. She seems to tease Rui a lot and even says he's boring when he feels conflicted about joining her in her "quest". She gets bothered by her mother because Misaki is always keeping track of her and Rui by constantly texting them but she adores her family and is very open with them.
As Misaki says, the way Sara's head is wired is just like her fathers and as Takumi says, her recklessness is just like her mothers.
Takumi Usui is the father of Sara Usui. She resembles her father most in appearance.
Misaki Ayuzawa is the mother of Sara. She resembles her mother most on her personality.
Rui Usui is the younger brother of Sara Usui. Sara is often with her little brother, so their siblings relationship is very close. She often teases him but still enjoys being with him.