Onyx is a fictional character from
DC comics. She is an old member of the
League of Assassins until she retired and decided to become a vigilante. She stays in
Gotham city, and decides to become an ally of the
Batman. She is called by Batman, told to protect
Orpheus and works for him until he dies. She battles
Jason Todd (
Red Hood). She's also an independent person that Batman lets roam free in Gotham.