natasha romanoff
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Natasha Romanoff also known as Black Widow, is a former agent of S.H.I.E.L.D. She is one of the founding member of the Avengers. Romanoff allies herself with Steve Rogers after HYDRA takes over S.H.I.E.L.D. Natasha Romanoff is currently in hiding from HYDRA.
Natasha doesn't have any super powers but she is an expert martial artist with impressive interrogation skills and competent scientific mind and hacking skills.
She is introduced in Ironman 2 where she is assigned to decide whether Tony Stark is eligible for The Avengers Initiative. She goes undercover as his secretary, named Natalia Rushman. She determines that Tony is ineligible for The Avengers Initiative but when Loki threatens the world in The Avengers, Stark is accepted.