Cassandra is a name from Greek mythology, similar to the "fancier names" mentioned in "The Naming of Cats". She is a sleek, exotic cat, her smooth graded colours, lack of fluff, and short wig suggest her to be an oriental breed, perhaps an abysinnian? She is cool and aloof, a highly prized pet wearing a pearl-studded collar, she is no feral street cat. Yet she is accepted in the tribe, and often seen as Alonzo's partner.
In Japan, that cat that we recognise as Cassandra was named Tantomile and vice versa, Cassandra was the name of the female twin. However the name is the only change, otherwise, appearance and role in the show makes the Japanese Tantomile - Cassandra.