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Nyssa Raatko, Ra's Al Gul's first-born daughter and one-time successor, used both male and female Ubu bodyguards as her servants, as apposed to her father who only used the males.
Cassandra recognized the nerve strike David Cain used on Vesper Fairchild because she used it frequently herself to knock out Stephanie Brown.
A Battle of Hypothetical Proportions appeared in Wizard Magazine #112, January 2001, pitting Batgirl (Cassandra Cain) against Batgirl (Barbara Gordon). The battle's outcome has Batgirl (Cassandra Cain) winning.