Well, one possibility is that Peter could use time travel to prevent certain events that led to his own death in Infinity War. He might go back and warn the Avengers earlier about Thanos' plan, which could change the whole course of the battle.
The impact on the plot could also be more subtle. For instance, Peter could travel back and influence a minor decision made by one of the Avengers. This small change could then snowball into a much larger alteration of the overall story. Maybe he convinces Tony Stark to make a different choice about a piece of technology, which then affects how they fight against Thanos later. Also, his presence in the past could attract the attention of other villains or forces that were not originally part of the Endgame plot, adding new layers of conflict and challenges for the heroes to overcome.
His character often becomes more mature. By time traveling during the Civil War, he sees the consequences of the heroes' actions on a larger scale. This makes him more responsible and strategic in his decisions.
In some fanfictions, Peter might time travel during the Civil War itself. He could go back and forth in time to gather information. For example, he might learn about the real intentions of certain parties involved in the conflict. Then, he uses this knowledge to expose the truth and end the war, bringing the Avengers back together. He could also use his time - traveling abilities to save lives that were lost during the actual events of the Civil War.
I'm not sure specifically about 'peter parker 5 1 fanfiction'. But there are many great Peter Parker fanfictions out there. You can try websites like Archive of Our Own. They have a vast collection of fan - made stories about Peter Parker that are really engaging.
In fanfiction, Peter Parker's age can vary widely. Some fanfics might keep him at his traditional comic or movie age, like a teenager in high school, around 15 - 18 years old. This allows for stories centered around his high - school experiences, dealing with bullies, and his early days as Spider - Man.
In some fanfictions, Peter Parker's asthma can add an interesting layer to his character. It could be used to show his vulnerability even with his superpowers. For example, during intense battles or moments of high stress, his asthma might act up, making the situation more challenging for him. Writers might use this to create more drama and tension in the story.
A really unique concept is when Peter's consciousness gets split among different dimensions. So he has to find a way to reunite his consciousness while also dealing with the different situations in each dimension. For example, in one dimension he might be a wanted criminal, while in another he's a hero worshiped by all. This creates a lot of internal conflict for Peter as he tries to piece himself back together.