"Sis" is a young rabbit, who is the oldest daughter of Mother Rabbit.  With her widowed mother and many siblings, they constitute one of the many families who live as common folk in the village of Nottingham.  Sis is probably not her real name, but a nickname given to her by her younger brother, Skippy.  She appears to be the oldest child in the family, perhaps a year or two older than her brother.  Sis has a general American accent.

Sis loves to tease her brother Skippy, but she also looks after him and plays with him, her younger sister Tagalong, and her other siblings...as well as the other children in Nottingham  She also has a girlish crush on Robin Hood.

Origins of the character: While there are no specific foundations for this character in the Robin Hood legends, Sis does represent a sample of the average citizens of the village of Nottingham.