Marvel DC Crossover

Who was the first female super hero in MCU ?  

According to MCU, the first female superhero of Marvel is Scarlett Johansson as Natasha Romanoff / Black Widow.  

Her birth name was Natalia Alianovna Romanova, she changed her name once she reached America. 

When she was 5 or 6 years old the Red Room burned her house down and its leader Ivan Petrovich took her to the place where she was brainwashed and totured into becoming the perfect spy.  

She was also given a much lesser refined super soilder serum. She was also trained by the winter soilder.  

The Red Room has a programe called the graduation ceremony where the girls are sterilized. She was the first black widow the only girl to survive the Red Room.  

Later she realized that she was being brainwashed and defected from the KGB and Red Room and became a mercenary by the end of this career 

she had made a name for herself as one of the most deadliest assasins the world has seen and was under SHIELDS radar.  

Hawkeye or Clint Barton was sent to kill her but he saw himself in her a girl who does not know better and introduced her to SHIELD.

After few years she along with Barton were the topmost agents of SHIELD. Later she becomes an avenger and fights to protect the world on a path to be healed and avenge the blood she spilled.