The Avengers would likely be very protective of her at first. For example, Thor might use his strength to keep her safe from any immediate threats. Iron Man could use his technology to check if she has any tracking devices on her or if she's been poisoned by Hydra.
The Avengers would start by trying to gain her trust. They might offer her food, shelter, and a sense of security. They'd ask her questions about her time with Hydra, but in a gentle way so as not to scare her. Over time, they could become like a family to her. Some of them could train her if she showed an aptitude for fighting or using special powers. They'd also introduce her to the outside world in a positive way, after she's been through such a dark experience with Hydra.
Captain America would probably be the one to really connect with her on an emotional level. He'd understand what it's like to be in a strange and dangerous situation, having been a soldier in a war. He'd try to comfort her and make her feel safe. The Hulk, on the other hand, might be a bit intimidating at first, but he could also be a source of protection. If any Hydra agents came near, the Hulk could easily scare them off. And Black Widow and Hawkeye would use their skills to keep an eye on her surroundings and make sure no one was sneaking up on them.
In the fanfiction, it might be that the little girl is a key to unlocking some secrets of Hydra. The Avengers, in their quest to dismantle Hydra completely, stumble upon her. She could hold the knowledge of hidden Hydra bases or their future plans. So they take her in to figure out how to use this information against Hydra.
Her powers could either strengthen or disrupt the Avengers' dynamics. If her power is really strong, like being able to manipulate time, it might make some members feel insecure or jealous. On the other hand, if it's a power that complements the existing ones, like she can heal while others fight, it could bring them closer together.
They might be in awe of each other at first. The Fanon Avengers could look up to the Canon Avengers as the originals, while the Canon Avengers might be intrigued by the unique takes on their characters in the Fanon world. They could start by comparing their powers and sharing stories about their adventures.
Well, Homelander is a complex and often self - centered character. If he were in an Avengers fanfiction, he might initially see the Avengers as a threat to his own status. He'd probably try to assert his dominance over them, thinking he's superior. He could start by showing off his powers, like his super strength and laser eyes, to intimidate the Avengers. But the Avengers, being used to dealing with powerful foes, would likely see through his bravado and not be easily cowed.
Snape would probably start off being rather aloof. He'd observe the Avengers' behavior and abilities before making any real moves to interact. He could be sarcastic towards them, especially if they make assumptions about him or his magic. But as time goes on, he might start to see their value and open up a bit more, sharing some of his magical knowledge.
Naruto would interact in a very enthusiastic way. He'd be in awe of the Avengers' powers and would want to learn from them. At the same time, he'd show off his own ninja abilities. He might bond with Hulk over their shared 'rage' - like Naruto has his nine - tailed fox anger and Hulk has his own. He'd also try to cheer up the more serious Avengers like Black Widow with his positive attitude. And he'd probably try to get them all to do some ninja training together.
They might start by comparing powers. Superman's super strength and flight would be quite a topic. Thor would likely want to have a friendly competition with Superman in terms of strength. Then they could move on to sharing their experiences. Captain America could talk about his battles during World War II, and Superman could share his adventures in saving Metropolis. They could also team up to fight a new, powerful villain that neither could defeat alone. For example, a villain with the ability to nullify Superman's powers and hack into the Avengers' technology.
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.
In fanfiction, Venom could interact with the Avengers in many ways. For example, he might initially be seen as a threat and the Avengers try to subdue him. But then they could discover that he has some common enemies, like certain powerful villains who are a menace to both him and the Avengers. So, they could form an uneasy alliance.
The Avengers and the Eternals could interact in a variety of ways. The Hulk might be intrigued by Gilgamesh's strength. Black Widow could try to figure out the Eternals' motives. And on the Eternals' side, Sersi might befriend Scarlet Witch and learn about her magic. There could also be some friendly competitions between the two groups, like a race between Quicksilver and Makkari.