Black Widow's debut in Iron Man 2 embodied everything her character was. Strong, formidable, independant, able to crack Happy's wrist with a simple handshake. Natasha goes on to prove herself not only to her colleagues over and over again, but to audiences as well. From fighting alongside Cap no matter what to sacrificing herself for the sake of humanity, there's no more red in Nat's ledger, but that doesn't mean we're not still crying over her death.
Black Widow was always front and center of the battle, no matter how dire the consequences. Her relationship with her sister Yelena is something fans will cherish long after her solo film. Take a look below and vote up the most heartbreaking details fans shared about Black Widow.