―Natasha Romanoff [src]
Natasha Romanoff, born Natalia Alianova Romanoff, code name Black Widow, is a former agent of S.H.I.E.L.D. Introduced in Iron Man 2, she assessed the suitability of Tony Stark for the Avenger Initiative. The report she filed with S.H.I.E.L.D. found that Stark was unsuitable for it but the Iron Man armor would be beneficial to the Initiative. She is a founding member of the Avengers and the only female founder of the group. Romanoff also played a crucial role in combating and defeating the HYDRA forces that had taken control of S.H.I.E.L.D. Romanoff is currently in hiding to establish a new cover identity, after all the identities she had previously used were compromised when she leaked S.H.I.E.L.D.'s secrets to the internet.
Though she has no superhuman powers, the Black Widow is an expert martial artist with impressive interrogation skills and competent scientific mind and hacking skills