Cassandra Jill Warlock was the Lord of The Warlock family and the Reincarnation of Morgan the Witch. Old Friends of Jiro and Alice, and was turned as a Kowloon Child.
Cassandra Jill Warlock or sometimes called Black Snake is once friends with Jirou and Alice until she was turned into kowloon child in Hong Kong and betrayed her own friends she is sometimes branded as a traitor of her own bloodline. She killed Alice Eve in Hong Kong but guarded its ashes afterwards. She is later revealed as the Lord of the Warlock family, her bloodline allows her to shapeshift. She was the first Vampire to be bitten by the father of the Kowloon children in Hong Kong.
Cassa is an extremely powerful vampire,capable of matching with Jirou's strenght during their combat without drinking blood for three months. Her primary weapons is a chained silver cross and a katana.
Even as a Kowloon child, Cassa enjoyed playing jokes and teasing people. It is revealed in the end that Cassandra's goal all along was to resurrect the Kowloon King and continue his bloodline. She is very brave and willing to sacrifice in order to continue her bloodline. It is revealed that her happiest moment in life was her time with Alice and Jirou even if she betrayed them.