Yllana Hastur is the daughter and youngest child of Mikhail Hastur and Marguerida Alton. She has two elder brothers, Domenic and Roderick. She fostered with Hermes Aldaran and his wife Katherine, their daughter, Terese, is her best friend. Yllana is described as having tawny eyes and willowy grace while inheriting her mother's wit and her father's cautiousness.