The Avengers' reactions to Harry Potter fanfiction would be quite mixed. Wanda might find similarities between the magic in the fanfiction and her own powers, which could make her more interested. Vision would be analyzing the story structure and the logic behind the magic system. Thor would be comparing the wizards to the Asgardian mages he knows. Some might find it a waste of time, while others would be drawn into the richly imagined world of the fanfiction. It really depends on their individual interests and how open they are to new and fictional concepts.
Tony would likely laugh at some of the more out - there plot ideas. He'd probably think he could come up with better technology than what's in the fanfic. Steve would be more open - minded and might enjoy the creativity. Thor would be like 'This is not like any Midgardian story I've heard!'.
Some Avengers might be amused. For instance, Tony Stark would likely find it a fun distraction from his usual high - tech world and might even make sarcastic comments about the plot or characters. He could say something like 'These wizards should really upgrade their transportation - brooms? Seriously?'.
Some of them would be entertained. Iron Man might laugh at the strange spells and potions. Hulk might not understand much but could enjoy the action parts if there are any. Thor could be curious about the magic and how it compares to his Asgardian powers.
The Avengers' reaction would be a mix of caution and curiosity. Hawkeye might keep his arrow aimed at Harry, ready for any sudden moves. Black Widow would be using her skills to read Harry's body language and try to figure out if he's lying. The Hulk might be held back initially, but if Harry made any sudden or 'threatening' moves, things could get really hairy. Overall, they'd all be on high alert until they understood that Harry was not an enemy but a young wizard with his own set of skills and a good heart.
He could be shocked. Maybe there are some fanfictions that take a very dark turn or have unexpected pairings that he never thought of. He'd probably need some time to process such strange ideas. And he might also be curious to see how far the creativity of the fans can go. He might even get some new ideas about his own life from reading some of the more imaginative fanfictions.
They would also be very protective. Tony Stark, for instance, would use his wealth and technology to give Harry a safe place to stay. Steve Rogers would offer his moral support and train Harry to be strong both physically and mentally. Natasha Romanoff would teach Harry self - defense skills. All of them would work together to make sure Harry never gets abused again.
Draco Malfoy would probably be outraged at first if he read fanfiction that showed him in a positive light towards Harry and his friends. He's so used to being on the opposite side, but then he might secretly be a bit flattered by some of the more complex characterizations of him.
He might be shocked. The fanfiction could have ideas that are completely contrary to his understanding of the future in the wizarding world.
Some of the Avengers would be very protective. Captain America would see Harry as a kid in need of guidance and safety, just like he does with his teammates. Tony Stark might be initially skeptical but would soon see the potential in Harry's magic. Thor would probably be fascinated by Harry's magical powers and see him as a worthy addition to their group.
If the Avengers read Naruto fanfiction, different members would have different reactions. Bruce Banner might study the way the characters control their inner power, like how Naruto controls the Nine - Tails' chakra. Steve Rogers might be more focused on the moral lessons in the stories. He would look for similarities and differences between the values in the Naruto world and their own. Natasha Romanoff could appreciate the complex relationships between the characters, just like she values her relationships within the Avengers. And Clint Barton would probably enjoy the action - packed parts, imagining how he could use some of the ninja skills in his own battles.
Some of them might be amused. For instance, Hulk could find it funny if Godzilla was shown as being weak in the fanfiction. He might laugh and say 'That big lizard not so tough!'.