Well, it depends on what he changes in the past. If he stops certain villains from emerging, the future of the Avengers could be one of relative peace. They might be able to focus on more positive things like exploring the universe or helping humanity in a more proactive way. However, if he changes things in a way that disrupts the natural order too much, it could create new and unexpected threats that the Avengers are ill - equipped to handle.
Well, they could have different reactions. For example, Tony Stark might be amused by some of the high - tech ideas in the fanfiction that he hadn't thought of yet. Captain America might be a bit shocked at some of the more modern or edgy interpretations of his character. And Thor could find the whole concept of fanfiction quite strange but also interesting as he sees how mortals imagine his future adventures.
Well, they might be shocked. Some of them could see their own deaths or the destruction of the world they're trying to protect. For example, Tony Stark might see if his attempts to save the universe are successful in the long run. And Steve Rogers could view how his ideals hold up in the future.
Definitely Captain America. Their relationship has always been complex and full of different ideologies. Meeting future Tony would be a big moment for Steve as he would see how Tony has changed or what new ideas he brings. Also, Thor would likely interact with him. Thor, with his Asgardian knowledge and power, would be interested in the future technology Tony might bring. And of course, Black Widow. She's the master of espionage and would be curious about Tony's motives and what he's hiding from his future.
One interesting plotline could be that future Tony brings advanced technology that completely changes the Avengers' combat strategies. For example, he might introduce new types of energy shields that are more powerful and adaptable. Another could be that future Tony has knowledge of upcoming threats that the present - day Avengers are unaware of, leading to a race against time to prepare for these new enemies. Maybe he also has some sort of personal growth or regret from his future experiences that he tries to correct in the present, which could lead to some very emotional and character - developing moments within the story.
The Avengers' reactions would be diverse. Vision, with his logical mind, might question the plausibility of some of the events in the fanfic. Wanda Maximoff could empathize with Peter's emotions in this future scenario. And Dr. Strange might be intrigued by the possible alterations to the timeline that Peter's future could bring. They would all likely come together to discuss how they could support Peter in this fictional future, whether it's through training, providing resources, or just moral support.
It could become more tense. If they see different versions of themselves or different outcomes for their relationships, it'll cause stress. For instance, if Vision sees a future where he and Wanda are separated, it'll be tough on their relationship in the present.