Black Widow

Black Widow, or Natasha Romanoff was believed to be dead. And she is. This is just an alternate reality where Hawkeye died in her place. So now she still takes on missions for S.H.I.E.L.D. to keep the peace throughout Earth. But just if you didn't know, Black Widow is an agent for S.H.I.E.L.D. and an associate of the Avengers who constantly helps both organizations with her master class skills in combat and mind games. But you had to have already known that. So if you knew that, you can piece together the rest of her life, right?