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.
Obviously, Peter Parker is one of the main characters. And then, the Avengers members like Tony Stark, Steve Rogers, Natasha Romanoff, etc. are also main characters as they are the ones adopting Peter. They play important roles in Peter's new life and in the overall story.
One interesting plotline could be Peter struggling to fit in with the Avengers' high - tech and super - powered world while still maintaining his normal life as a high school student. For example, he might have trouble keeping up with the Avengers' training schedules while also studying for exams.
Iron Man would be a likely candidate. He's already shown a sort of father - figure - like relationship with Peter in the movies. He can offer Peter high - tech resources, valuable advice on being a superhero, and also teach him about responsibility in a more modern way.
Well, in some 'Avengers adopt Peter fanfic', a great plotline is when the Avengers discover Peter's identity and decide to take him in. They start to teach him things like how to better control his powers. There could be a plot where Peter has a falling out with one of the Avengers, like Thor perhaps, over a misunderstanding about how to use his powers in a certain situation. Then they have to work through it and become closer as a family.
Another common theme is protection. Since Peter is often a young superhero, Steve and Tony are constantly trying to protect him from various threats, both as his dads and as fellow heroes. For example, in many fics, they protect Peter from villains who might target him because of his powers or his connection to them. And also, growth is a common theme. Peter grows as a person, learning from Steve and Tony, and they also grow as parents.
The theme of growth is also prevalent. Peter grows not only as a superhero but also as a person under Tony's influence. He learns new skills and also gains more confidence. At the same time, Tony also grows in his ability to care for someone in a father - son type of relationship. In some fanfictions, they both face challenges together which further strengthens their bond and shows their mutual growth.
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.