Some would be shocked. Take Nancy, for instance. If she saw fanfiction that delved into her romantic relationships in new and unexpected ways, she might be taken aback. She's used to her story being told a certain way in the show, and this new take would be quite different.
The kids especially would probably have a lot of fun with it. They're at an age where seeing themselves in different scenarios is exciting. Max might be excited to see herself as an even more badass character in the fanfiction. And the boys would probably have a good laugh and debate about which fanfictions are the most accurate or the most out - there in their portrayals of the group's adventures.
The younger characters like Lucas and Max might get really excited about the fanfiction. They could see it as an extension of their own adventures. They might start imagining themselves in the scenarios written by the fans. It could also inspire them to think about their own actions in different ways, like if a fanfiction shows them facing a new type of danger in the Upside Down, it could make them feel more brave and ready for future challenges in their real story.
Some MHA characters might be flattered. For example, Midoriya would probably be really excited and take it as a sign of how much he's inspired people. He might even look for positive lessons in the fanfiction to improve himself.
The characters might have a mix of reactions. Hopper, being the more down - to - earth type, could be skeptical about the whole idea of fanfiction. He might think it's a strange way for fans to play with the story. On the other hand, Steve could find it amusing, especially if he's portrayed as a super cool action hero in the fanfictions, which is a bit different from his initial role in Stranger Things.
There are those who would be critical. Characters like Iida might analyze the fanfic for its accuracy in terms of the My Hero Academia universe's rules and ethics. If there are any inaccuracies, he might be quick to point them out.
Yang would likely have a big reaction. If the fanfiction shows her in a cool fight scene, she'd be all for it and might even show it off to her friends. But if it portrays her in a negative or weak way, she'd be really annoyed.
Some characters might be flattered. If they are depicted as heroes in the fanfiction, it would boost their egos. For instance, Oliver Queen might enjoy reading about himself as an even greater hero than he already is.
Percy would probably find it hilarious. He has a good sense of humor and would likely enjoy the wild and crazy scenarios fans come up with. He might even share the funnier ones with his friends at Camp Half - Blood.
Naruto would be thrilled. He loves attention and the idea that people are writing stories about him would make him feel really special. He might even try to find the authors and befriend them.
Some characters might be curious. They would want to see how fans perceive them. For instance, Aunt May could be interested to know how fans write about her relationship with Peter in the fanfiction.
The Capitol citizens would likely be entertained. They live in a world of excess and novelty, so reading fanfiction about the Hunger Games characters would be just another form of amusement for them. However, the tributes from the districts might have a more complex reaction. For those from the poorer districts, it could be a source of hope or a cruel reminder of their situation, depending on how the fanfiction is written. For example, if a fanfic shows a district winning in a way that seems impossible in reality, it could give them hope, but if it's a cruel or inaccurate portrayal, it could be disheartening.