'You're nuts, Cassy.' -Alicia, Series II, Chapter 38

Appears in: Series II, Chapters 38-43, Chapter 46;
Series IV, Chapter 95

Lierlo's half-sister on his mother's side. Cassandra is an orange-eyed Cielnoir girl, with very long and wavy green hair tied in two bunches. Saying that Cassandra is strange is somewhat an understatement; she has many strange habits and went through a period of total infatuation with Lierlo. She has a Cywyrm Spirit Familiar called Syleshia. The Cassandra that met with the gang was from Adrienne's time, ten years in the future. This meant that when they met the Cassandra of their own time, she did not know them. Present day Cassandra appears to be friends with the Cielnoir leader, Jadarthfeyr.