A really interesting plot could be a time - traveling crossover. Supergirl goes back in time to the era of the original Avengers. She helps them in a battle that changes the course of history. In return, the Avengers help her find a way back to her own universe. During this time, she forms a special bond with Thor, as they both have superhuman strength and a connection to otherworldly powers.
A 'Avengers Supergirl Crossover Fanfiction' might involve Supergirl's Kryptonian powers being a mystery to the Avengers at first. She could show off her super strength, heat vision, and flight, and the Avengers would be in awe. Then they'd start to strategize together. For example, Captain America would lead the group with his military tactics, while Supergirl uses her powers to do the heavy - hitting. And Hulk and Supergirl could have a fun interaction comparing their strength.
I think Supergirl and Black Widow would be an interesting pairing. Black Widow is a skilled spy and fighter, while Supergirl has superpowers. They could learn from each other. Black Widow could teach Supergirl some stealth techniques, and Supergirl could protect Black Widow during battles with her super strength and speed.
Supergirl and Black Widow would be a great pairing too. Black Widow could teach Supergirl some stealth and espionage skills, while Supergirl could show Black Widow the power of flight and super - strength. They could also bond over their experiences of being different in their respective worlds.
Supergirl would probably start by introducing herself and her powers. The Avengers would likely be in awe of her abilities. They might ask her to join them on a mission right away. Supergirl could say yes and then start showing off her skills during the mission.
One idea could be that a powerful villain threatens both their cities simultaneously. Supergirl and The Flash have to team up, and in the fanfiction, their different powers and personalities could lead to some interesting interactions. For example, Supergirl's strength and The Flash's speed could be combined in unique ways to defeat the villain.
Well, she might show off her super strength and flight abilities to the Avengers. They could be both impressed and a bit wary at first. Maybe she'd team up with Thor and they'd have a friendly competition about who can fly faster or hit harder. Then she could also share her knowledge of different threats from her own universe with the Avengers, and together they could come up with new strategies to face common enemies.
Some of them would be in awe. For instance, Hawkeye would be amazed by Supergirl's powers. He might even joke about how his arrows seem useless compared to her abilities. Hulk might initially be aggressive, but if Supergirl showed she wasn't a threat, he could become curious. Iron Man would probably want to study her powers, maybe even try to incorporate some of her technology into his suit if possible.
Well, they might first be a bit suspicious of each other. The Avengers are used to their own world of threats and heroes, and Supergirl comes from a different universe in the DC world. Maybe Iron Man would be the first to start analyzing Supergirl's powers. He'd be really intrigued by her flight and super strength. Captain America, on the other hand, would probably be more focused on whether she could be trusted. And Supergirl would be equally curious about these new heroes. She might find Thor's hammer really interesting and wonder if she could lift it.
One idea could be that Supergirl's powers are misinterpreted by Shield as a new threat. So they send some of their agents to investigate. The agents then realize she's actually a hero and they team up to fight a common enemy like a powerful alien race that's planning to invade both their worlds.