Black Widow (Natasha Romanova)

Natalia Alianovna Romanova aka Black Widow was a former Russian KGB agent. She was trained by the "Red Room" as part of the Black Widow Ops Program to be the ultimate "Super-Spy". She defected to the United States of America from the Soviet Union to join S.H.I.E.L.D. Later Black Widow would then become a member of the Avengers and has been on the team on multiple occasions. She is a woman with a mysterious past which few know about.