Sierra is an outstanding beauty with honey-sweet blond hair akin to melted gold with hair strands hanging on either side and deep blue eyes. She is the fourth wife of Lant Agriche, as well as the mother of Roxana Agriche and the deceased Achille Agriche. Lant Agriche is the head of the Black Agriche, one of the five ruling families that is associated with theft and drugs. She is a shy and mild-tempered woman who cares about her children, whom she always reminded to become "true Agriches".