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| David Cain's second daughter, sister of Batgirl Cassandra Cain. The identity of Marque's mother has not been revealed, though it is possibly Lady Shiva. |
| Like Cassandra, Marque was considered more of an experiment than a daughter by Cain, another of his attempts to create the ultimate warrior. She was raised among the League of Assassins and trained intensively in martial arts and assassination techniques. Given her current communication ability, it is likely that she was not raised without speech as Cassandra was. Marque understood early on that she was nothing but a tool to her father and would never have his love. Fueled by resentment, she planned to use Cain's teachings to one day destroy him. |
| After running away, Marque devoted herself to her father's downfall. He eluded her for many years but eventually, her search led her to her sister Cassandra (Batgirl). |
