Cassandra is the longer one. She debuted in 2095 as Vanity's replacement for Sweet Thing/Ms. Liberty. She had a dominatrix gimmick basically. She would later join up with Pegasus and Raw Power before splitting with the Pillars of Power and joining off and on with Chaos. She would also team up with Anaxis for a while.
Anaxis was Heracles valet and was an old school Greek girl with an attitude. She debuted in 2102. She left when Heracles did.