A/D there could be a CA:TWS spoiler in Clint's story. It depends on how you look at it, since this is an AU.

Clint Barton.

Clint once had a father, a mother, and a brother. They weren't a happy family. Their father was abusive and almost always drunk. One day Clint's parents died and Clint and Barney were put in a home.

Several years later Barney and Clint ran off to join a circus. They both worked as stage hands until Barney got bored and decided to join the military, naturally Clint followed.

There they discovered that Clint was a perfect shot. After the brothers had been discharged, Barney died from an alcohol overdose. Clint had turned to crime and gotten on Shield's radar. He was soon recruited due to his perfect aim.

After several months of training he was sent on a trial mission to kill The Black Widow. They used that as an excuse to get rid of Clint because he didn't easily follow orders.

The woman's hair was dyed black. Her green eyes stood out vividly as she had stared Clint down.

"Kill me." She demanded with a thick Russian accent. That's exactly what Clint did. After Shield disbanded Clint was left to fend for himself, he wasn't trained for much and decided the only place left to go was back to Carson's Carnival Of Traveling Wonders. There he worked as a stage hand until he died three years later.

Natasha Romanoff/Natalia Romanova

Natasha was raised in the Black Widow program she easily surpassed all the other girls and became Red Room's prime agent, along with a man called The Winter Soldier.

The two went on several missions together before The Winter Soldier disappeared. After that Natasha refused to work with a partner.

On one mission one of her targets had tried to plead with her and explained everything about The Red Room to Natasha. That had caused her to try to figure out what happened with The Winter Soldier.

Red Room had decided to test her by dismissing her to see what she would do.

So when a Shield Agent killed Natasha they were all surprised that the Black Widow had been murdered so easily.

There'll only be one chapter left after this, unless someone wants me to write a different version of one of the stories and I tweak the facts to get a different outcome. Just let me know who and what you want me to change :)

Next will be Bruce and Thor.