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.
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.
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.
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.
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.
In such a fanfiction, they might team up to fight a powerful new villain. For example, a super - intelligent alien who plans to take over the Earth. The Justice League could initially be skeptical of Supergirl, but as they see her powers in action, they come to respect her.
I think 'avengers meet the seven fanfiction' might be a fan - created story where the Avengers and the Seven cross paths. It could explore things like cultural differences between the two groups if they are from different fictional settings. For example, the Avengers' values from the Marvel world and whatever values the Seven hold. It might also show how their different abilities work together or against each other in various scenarios like a big battle or a mission to save a world that is in danger due to some common enemy.
Well, in this 'avengers meet frigga fanfiction', it could center around Frigga using her magic to help the Avengers in some way. She might be a key to solving a mystery that the Avengers are facing. For example, she could have knowledge about an ancient artifact that the bad guys are after, and she teams up with the Avengers to keep it safe. Also, there could be some emotional moments as the Avengers, who have lost so much, find a mother - like figure in Frigga.
The Avengers might react in different ways. Steve Rogers would probably be polite but firm in getting to know Peter's boyfriend. He'd want to ensure that he was a good influence on Peter. Thor, on the other hand, might be a bit more boisterous. He could either be really friendly and enthusiastic, or his loud and powerful presence might accidentally scare the boyfriend a bit.