Well, maybe the little girl is a huge Avengers fan. One day, she gets into some sort of trouble, like being chased by bad guys who are after her unique abilities that she doesn't even fully understand yet. The Avengers find her and see her potential. Tony Stark might be the first to be charmed by her spunk and intelligence. So, they decide to take her in, protect her, and train her to be a part of their team in the future.
I think it would be Spider - Man. He's closer to her age in a way compared to the other Avengers. He can understand her more easily, like the things she likes, the new trends, etc. And he has that friendly neighborhood hero vibe that would make the girl feel comfortable around him quickly.
Well, perhaps the little girl has some special power that the Cullens notice. So they decide to take her in to protect her from those who might misuse her power. For example, she could have the power to predict the future in a very unique way that even the Cullens find fascinating.
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.
There could be a human character, perhaps a teacher or a neighbor who notices the strange situation with the Cullens and the little girl. This character could add some extra drama as they try to figure out what's really going on with this family that seems a bit different. They might suspect the Cullens are up to something not quite normal and start to investigate, creating more storylines.
Thor would be a likely candidate. Since he is Loki's brother, he already has a connection with him. Thor might be the one to convince the other Avengers to give Loki a chance and be the first to reach out and try to befriend him in this new situation.
Definitely Tony Stark. He's rich, brilliant, and has that father - figure potential. His sarcastic nature also adds a lot of humor to the stories. Captain America is also popular. He represents values like honor and loyalty, and he would be the one to teach the reader about these important things. Thor can be really fun in these stories too. His god - like powers and his sometimes - cluelessness about Earth things make for some great interactions with the reader.
One interesting plotline could be the reader having a special power that the Avengers initially don't understand. For example, the reader might be able to control time in small bursts. The Avengers, being protective, try to help the reader master this power without it getting out of control. Another plotline could be the reader coming from a difficult background, like being an orphan in a war - torn area. The Avengers adopt the reader and show them a new life filled with hope and family. It could also be that the reader has some sort of connection to an enemy the Avengers are facing, and they have to figure out how to deal with that while still protecting the reader.
A common plot is the Avengers protecting Peter from his enemies who now see him as an easy target because he's associated with the Avengers. For instance, some of Spider - Man's classic villains might team up to take him down. The Avengers then have to use their combined skills and powers to keep Peter safe. This not only shows the Avengers' loyalty to Peter but also how Peter learns from them in the face of danger.
Tony Stark is really popular. He often takes on a mentor role to Peter, using his intelligence and resources to help Peter become a better superhero. Another popular character is Steve Rogers. His sense of justice and leadership can inspire Peter. And of course, Peter himself is central. Readers love to see his growth and development as he interacts with the Avengers.