Sandra Wu-San

Sandra Wu-San, better known as the assassin Lady Shiva, is one of the greatest martial artists in the world. She has been known to work with and as both heroes and villains alike. She is the mother of Cassandra Cain. Lady Shiva has acted as a mentor to The Question, she's trained Tim Drake (the third Robin), assisted Batman in his recovery after Bane broke his back, and has at times even been a member of the Birds of Prey and the League of Assassins.