Cassandra Cain/Orphan
Cassandra Cain is one of my favorite characters who I feel is underutilized. Like Jean Paul Valley she was raised to be an assassin. She had killed her first man by the age of five. She dedicated so much of her time to becoming the perfect weapon that she didn’t speak until she was in her teens. She is the daughter of Lady Shiva (one of the DC Universes top martial artists and assassins). She was trained to be the perfect body guard for Ra’s Al Ghul.
Bruce Wayne took her in and began to rehabilitate her. He eventually would move to adopt her, and she would become one of his top agents as Orphan.