Raven is described as having black hair, which is cropped short and stick straight and glossy. Her skin is a rich caramel color. She has dark eyes, shaped like almonds, and an oval face.
From the information above, it can be concluded that she comes from an Asian background, or at least her character is based off of an East Asian girl, as she wears a dress similar to a kimono when she visits the House of the Lake while with her mistress, the Countess of the Stone. The same applies for the initial prep-process, when she was described to be wearing a red-gold robe, seemingly of East Asian origin.
When Raven was 12 years old she passed the Surrogate test and was transferred to Southgate, leaving her family behind.
After one year in Southgate Raven meets Violet Lasting in class and helps her with the first augury. The two become best friends ever since. She later reveals to Violet that she failed her first year at Southgate on purpose.