Here are the backstories that I had in mind for the characters. I hope you enjoy them.

Feel free to send requests. I have a few ideas in mind for one-shots.

Prepare for the angst!

Captain Hydra & the Winter Soldier

Months after disappearing into the ice, Captain Steve Rogers had been found and rescued from his icy prison. Unfortunately, it had been Hydra that had found him. Hydra had wiped Steve's mind completely clean so they could twist the Captain into becoming their Leader.

Captain America was dead, he was now Captain Hydra. With the Super Soldier Serum running through his veins and a strong army at his command, Steve led Hydra through multiple wars. However, deep within his broken mind, Steve could barely remember the face of a beautiful woman… and a dance.

During the rule of Captain Hydra, the fallen body of Sergeant James Barnes had been found by Dr. Zola. When Steve saw the broken man, something familiar buzzed in the back of his mind. A feeling that he couldn't quite explain.

Under the order of his leader, Zola had Barnes become his first subject for the Winter Soldier Project. Captain Hydra even personally donated his own blood so that Barnes would have the Super Soldier Serum as well. After receiving intense training and a new metal arm, the Winter Soldier was ready. He was a ruthless killer, and very loyal to his Captain. From the minute he was awakened, the Winter Soldier became protective over his Captain, for a reason that not even Zola could explain.

Superior Iron Man

During a weapons presentation in Afghanistan, Tony Stark had been kidnapped and disappeared off the face of the Earth. His best friend, James Rhodes had searched high and low for him but eventually, they had no choice but to officially declare the man dead. Especially after they found the hideout to the Ten Rings destroyed.

What no one knew was that Tony was still alive. While in captivity, the man had been tortured and experimented on. As a result, Tony had a miniature arc reactor installed into his chest, as well as gaining technopathic powers. The torturous months had resulted in Tony's mind becoming twisted and a new goal on his mind. He was going to track down everyone who had his weapons until he became Superior to them all. With his new power, Tony killed everyone that held him captive and escaped the cave.

However, instead of returning home, Tony disappeared into the world, keeping his survival a secret from everyone: Stane, Rhodey, Happy, and even Pepper.

The path he was building was a path they couldn't follow him on. They were better off thinking Tony Stark was dead.

That way, Iron Man could rise.

The Incredible Hulk

Bruce Banner was not a person who believed in miracles, he trusted science, numbers, and facts. However, after surviving a major Gamma Radiation explosion, he started questioning the subject of miracles. Unfortunately, Bruce learned very quickly that his survival was no miracle, it was a curse.

The exposure to radiation did much more than just give Bruce Banner an alternate personality. It had tainted with his mind, the radiation corrupted his mind to a cycle of insanity. At first, it seemed fixable. All his symptoms measured up towards schizophrenia. Bruce had a hard time recognizing reality from hallucination and he felt urges, powerful urges of anger. He was filled with the desire to destroy everything in sight.

It seemed fixable. However, the blackouts began, and the destruction that followed.

That wasn't fixable.

As the corruption in his brain continued to spread, Bruce becomes more lost in the monster that has taken over his life. Even while he is aware of the beast inside of him, Bruce will always fall victim to the voice in his head.

The voice that is always telling him to kill, to smash, to let the beast free.

Black Widow

Ever since she was young, Natasha Romanoff had been a member of the Red Room Academy, where she endured both an education and indoctrination into the world of spy-craft. In this strict environment, Natasha had excelled in all of her training and soon became a master spy as well as one of the world's greatest and deadliest assassins.

Because of her high sets of skills, Natasha had earned the mantle of Black Widow. Eventually, Black Widow gained a high reputation throughout the world, she was known as a risk to global security. No matter who was sent to take her down, the Black Widow survived every assassination attempt.

However, one day, when she was hired to find Georgi Luchkov, it turned out someone else was after him.

Rōnin, or formerly named Clint Barton.

Rōnin

Clint Barton had a perfect life; a beautiful wife, loving children, and days filled with happiness and love. It was perfect, too perfect in fact. Long ago, Clint had once been known as Hawkeye but he buried that part of him when he started a new life with his wife, Laura. Desperately trying to bury the man he used to be.

However, someone from his past caught up with him and decided to pay him a special visit.

Rather than just killing Clint off, the man had killed off his family. Essentially killing off the part of Clint that made him who he was. As a result of the loss, Clint was turned back into the man he used to be, a ma who shows no mercy. As the man dug up his past life, he also buried his old one. He was no longer Clint Barton nor Hawkeye. He was now, Ronin.

Picking up his old bow and arrows, and a new samurai sword, Ronin traveled across various countries and slaughtered anyone he saw deserved it. Going by the name of Ronin.

One day, on a mission, Rōnin met the Black Widow. A partnership was born.

King of the Nine Realms

While peace was highly respected in the Nine Realms, war was also inevitable. When the golden kingdom has lost its beloved Queen, Frigga, all of Asgard mourned. But none as more as Odin. The king's heart had been hardened to stone.

Driven with grief, Odin had his young sons, Thor and Loki, train every hour of the day, so that they can be ready for the next attack of an inevitable war. Throughout their entire childhood, the princes were treated as warriors rather than children. Their father paranoia and persistence had twisted both of their souls. Even though it was not his intention, Odin was inadvertently turning both his sons into Asgards worst nightmare.

Darkness grew with the eldest son, Thor, as he began craved the Throne, to be the ruler of the Nine Realms. But when Odin saw the corruption he had put into his son, he refused. Meanwhile, Loki had lost all trust in his father, the only person in the Nine Realms he trusted was his brother.

Fueled with anger and betrayal, Thor tried to take Asgard by force, by killing his father. He had Loki fight alongside him.

Unable to kill the monster that he had created, Odin had Thor and Loki banished from Asgard as well as the Nine Realms. The siblings reigned Hell upon all the planets they came across.

Venom

All his life, Peter Parked had been raised in a safe and loving environment, he was protected too well. May and Ben Parker did their best to shield their nephew form the dangers of the world, knowing that Peter would have to face it one day on his own. They tried to prevent that from happening. However, Peter was forcefully introduced to the real world when his Aunt and Uncle were killed.

Without any other immediate family, Peter was sent away to foster care. On that same night, a symbiote that calls itself Venom escaped from a lab and chose Peter Parker to be its host. When the boy pleaded that there was a monster inside of him, his foster parents thought he was insane and sent him away to a mental institution. Claiming that Peter was too dangerous to be around the other children. Peter wasn't treated any better at the institution. No matter how hard the boy begged to be believed, the doctors insisted that he had schizophrenia, refusing to listen to him, and taking drastic measures towards "curing" him.

Unfortunately, all of the electric therapy and hours in the isolation rooms caused Peter's mind to break, and he finally accepted that the world was a terrible place with terrible people in it. The realization led to Peter finally giving and accepting Venoms' dark intentions. Venom had insisted that he only wanted what was best for Peter.

After eating all the evil doctors, Peter escaped. Orphaned and alone, but at least he had Venom.

Baba Yaga

After being released from prison, Scott Lang needed a job if he wanted to see his daughter but it was hard for an ex-thief to find a good job. Just as Scott was considering returning to his old habits, he was approached by Dr. Hank Pym. The former scientist explained that Scott's engineering talents were exactly what he needed for a special project he was working on. Desperate for a chance to see Cassie, Scott instantly agreed, unaware that the project was not only secret but also illegal.

However, on the day of the experiment, everything went wrong. The project blew up, destroying the entire building, with only Scott as a survivor. When the man recovered in the hospital, Hank had discontinued the project, and Scott was left to take the blame. As if that wasn't bad enough, the explosion had destroyed Scott's molecules, which now gives him the ability to phase through solid objects and turn invisible. With his new powers, Scott ran away, forced into hiding, and unable to see Cassie.

Hank Pym took away Scott's last chance to see his daughter and threw him under the bus. Once again, Scott was a wanted man. He had no one who was willing to help him.

That is, until Scott was approached by Bill Foster and his protegee, Ava Staar. The two promised that they would not turn him in, they only wanted to help.

Dr. Foster was able to help Scott stabilize his condition but also revealing that it would soon kill Scott.

However, Bill and Ava said that they could save him if Scott chose to help them in return, for they two wanted revenge on Hank Pym.

With a condition that would soon kill him and nowhere left to run, Scott agreed. This was his last chance to have Cassie back.