You can try websites like Archive of Our Own (AO3). It has a large collection of fanfictions including those related to Age of Ultron. Just go to the site, use the search bar, and type in 'Age of Ultron' to find relevant fanfictions.
Another way Peter could be of help is with the setting. He could describe in detail how New York City (or wherever the story is set) looks during the Age of Ultron. With his knowledge of the city streets and rooftops, he could make the battle scenes more vivid and realistic.
It can also be frustrating at times. Some fanfictions lack the proper understanding of the movie's lore. They might introduce concepts that don't fit well with the established Marvel Cinematic Universe. But on the positive side, many fanfictions are a labor of love. Authors pour their passion for the movie into their writing, and that can really shine through, especially when they capture the essence of the characters as we know them from the movie.
Well, one reaction could be excitement. Fanfictions often explore different aspects of the characters and storylines that might not have been fully delved into in the movie. For example, they might focus on the relationships between the Avengers in more depth, like the budding romance between Black Widow and Hulk. It can be really interesting to see how different authors interpret the characters' emotions and motives.
Spiderman's presence could also change the outcome in terms of morale. His youthful energy and determination could inspire the other Avengers. In the face of Ultron's seemingly unstoppable army, Spiderman's never - give - up attitude could be the spark that keeps the Avengers fighting and ultimately leads to their victory.
You can try looking on websites dedicated to fanfiction. For example, Fanfiction.net. Just go to the site, use their search function and type in 'Avengers Age of Ultron'. It'll show you a bunch of fan - created stories. AO3 is another good place. They have a lot of high - quality fanfiction, and it's easy to navigate through their categories to find what you're looking for.
One possibility could be that Naruto is somehow transported to the Avengers' world during the Age of Ultron. He might initially be seen as a threat due to his strange powers. But then he could prove his worth by using his ninja skills to fight Ultron's minions. His shadow clone jutsu, for example, could be very useful in confusing the robotic enemies.
Peter could be a new recruit in the Avengers in the fanfiction. He'd bring his youthful energy and fresh perspective. His scientific knowledge, if it's Peter Parker, could assist in finding weaknesses in Ultron's plans.
One great place is Archive of Our Own (AO3). It has a vast collection of fanfiction for Age of Ultron. Another option could be FanFiction.net, which also hosts a lot of fan - created stories related to the movie.
One popular story is 'Ultron's Redemption' which gives a different take on the villain. Another good one is 'The New Avenger' which focuses on a new character joining the team during the events of Age of Ultron. 'Allies in the Shadows' is also great as it explores some of the side characters more in - depth.