Many would be excited. Mineta might be really into the action scenes, especially when Spider - Man is fighting on top of buildings. He would probably be shouting and cheering during those parts. The other characters might be more focused on the character development, like how Peter grows from a shy high school student to a more confident hero, and they could take lessons from that for their own growth as heroes in their world.
Some would be inspired. Characters like All Might might see Peter Parker's journey as similar to his own in some ways. Both are trying to do good in a world full of challenges. All Might could appreciate Peter's determination to protect his city despite having a normal life outside of being a hero.
There would be those who are critical. Tsuyu might question some of Spider - Man's actions. For example, when he doesn't immediately tell Mary Jane about his identity. Tsuyu is a very straightforward character, and she might think that being honest from the start is the best approach. However, she could also understand the need for secrecy to protect his loved ones.
The BNHA characters might also be intrigued by the villains in Spider - Man 2002. The Green Goblin, for instance, is a very different kind of threat compared to the villains they face. This could make them think about different ways to combat enemies. Uraraka might be thinking about how she could use her quirk against someone like the Green Goblin, who has such high - tech weaponry and flying capabilities.
The other characters' reactions could be quite diverse. Flash's friends might be supportive at first, thinking it's just a new hobby of his. But as his pretense continues, they might start to get annoyed. The bullies in Flash's clique could see it as a weakness and start to pick on him. Meanwhile, the people who are actually Spider - Man fans might be outraged that Flash is faking it just for attention. They could confront him and expose his falsehood, leading to a big drama in the story.
The BNHA characters would also likely be inspired by the themes of responsibility in the Spider - Verse fanfic. Just as Spider - Man has 'great power comes with great responsibility', heroes like All Might could see similarities in their own mantles of being heroes and protecting the innocent. They might start to think about how they can better uphold their own responsibilities in their world after reading such fanfic.
The Avengers would be very concerned. Captain America would immediately take charge of the situation, trying to keep everyone calm while they assess Spider - Man's injuries. Iron Man would start scanning for the best way to treat him, using his high - tech equipment. Thor might offer some of his Asgardian knowledge of healing, if there was any. Black Widow and Hawkeye would be on guard, making sure there were no further threats while the team focused on Spider - Man.
Spider - Man fanfiction often showcases the creativity of the fans. For instance, there are fanfictions that put Spider - Man in crossovers with other superheroes or even in different historical settings. I think it's a great way for fans to express their love for the character and expand on the Spider - Man universe that we know from the comics and movies.
Many of them would be eager to adapt some of the techniques. Kirishima, for instance, might see the way Spider - Man uses his webs to swing and think about how he could use his Hardening quirk in a more dynamic way during battles. He might start practicing new combat moves inspired by the Spider - Verse action.
One common theme is the clash of different power systems. Since BNHA has quirks and Spider - Man has his own set of powers, seeing how they interact is often explored. For example, how his spider - sense compares to the danger - sensing quirks in BNHA.
He would be very hurt. He might isolate himself for a while, doubting his own judgment in trusting his friends. Spider - Man might also start to question his identity as a hero. After all, if his friends can turn on him, what does that say about his relationships and his role in the world?
Spider - Man would probably be defensive at first. He's used to working alone most of the time, and being interrogated by the Avengers would seem unfair to him. He might crack some jokes to ease the tension, but also firmly state that he's a hero too.
Spider - Man would likely be confused at first. He respects the Avengers and can't understand why they are suddenly after him. He might try to talk to them, to explain that he's innocent. For example, he could swing up to Captain America and start pleading his case.