Black Widow

Natasha Romanoff, also known as Black Widow, is a fictional Marvel superheroine, a former KGB assassin who becomes a top S.H.I.E.L.D. agent and a founding member of the Avengers, famously portrayed by Scarlett Johansson in the Marvel Cinematic Universe (MCU). Trained in the Red Room, she is a master spy and martial artist who sacrifices herself in Avengers: Endgame to help defeat Thanos. An expert in espionage, hand-to-hand combat, and tactics, she uses gadgets like her "Widow's Bite" wrist-mounted weapons. Born in the Soviet Union, she was indoctrinated into the "Red Room" program as a child, trained as a spy and assassin. Natasha Romanoff (Black Widow) is a complex character defined by her sharp intelligence, stoic exterior, and deep-seated loyalty, haunted by a dark past as a Red Room assassin. She's fiercely independent, resourceful, and pragmatic, often hiding vulnerability beneath a controlled, witty, and sometimes flirtatious demeanor, but her core is driven by redemption, selflessness, and fierce devotion to her found family, the Avengers.