They may be either amused or annoyed. It depends on how they are portrayed in the fanfiction. If it's a positive and creative portrayal, they might be amused. But if it's a negative or inaccurate one, they could be annoyed.
AO3 is great for My Hero Academia fanfiction. It allows for detailed tagging, so you can easily find the specific type of story you're interested in, whether it's about a particular character, a certain ship, or a specific plot type. FanFiction.net has a large and active community, so there are always new stories being updated. Wattpad, on the other hand, may have some unique interpretations and crossovers that you might not find elsewhere.
The heroes in MHA like All Might might view Dabi fanfiction with a sense of concern. All Might has always been about justice and the greater good. He might see Dabi fanfictions as a sign of how some people are attracted to the darker side of the hero - villain dynamic. He could worry that it might influence younger fans in the wrong way. However, villains in MHA might have different reactions. Shigaraki could see Dabi fanfictions as a way to understand how the public perceives Dabi and use that knowledge to his advantage in his evil plans.
Some characters could actually be flattered. They may enjoy seeing how much the fans care about them and their story. However, there could also be characters who are confused by some of the more out - there concepts in fanfiction, like when a character from a different universe is introduced into the My Hero Academia world in a fan - made story. They might wonder how such a thing could be possible within the context of their world.
Well, from what we know of the My Hero Academia world, there's no evidence to suggest that they do. Their world is filled with real - life heroics and challenges. Fanfiction is more of an outside - world creation for fans. However, if we were to think creatively, maybe some of the more tech - savvy or curious characters like Mei Hatsume might stumble upon something similar if there was a crossover into a world where fanfiction existed within their universe, but it's really just a fun thought experiment.
Then there are those like Izuku Midoriya. He might study the fanfiction from a different perspective. Since he's always analyzing quirks and hero strategies, he could look at how the authors in fanfiction have reimagined the characters' quirks and relationships. He might even get some inspiration from it for his own hero analysis notebooks.
To create compelling characters in My Hero Academia villain - hero fanfiction, first understand the existing character archetypes in the series. For villains, think about their motives. Are they after power like Overhaul? Or do they have a more complex backstory like Shigaraki? For heroes, don't just rely on their quirks. Develop their personalities, like All Might's unwavering sense of justice. Also, consider how they interact with each other. A hero and a villain could have a shared past that shapes their present relationship.
Stain could be considered as an anti - hero in fanfiction. His extreme views on heroes, while not entirely acceptable, could be delved into deeper. He believes that only true heroes should be recognized and is willing to take extreme measures to prove his point. A fanfiction could explore a different side of him, perhaps one where his actions are more nuanced.
It's possible. If we consider the idea that the Boku no Hero Academia universe has a concept of our world's fanfiction, then some of the more tech - savvy or curious characters could potentially stumble upon it. Maybe a character like Izuku Midoriya, who is always eager to learn about heroes, might be interested in seeing how fans view the hero world in fanfiction. However, this is all in the realm of creative speculation as the original series doesn't touch on this directly.
For the teachers in My Hero Academia, like Aizawa, he would probably be indifferent to most ships fanfiction. But if there were ships that involved his students in inappropriate or unethical ways in the fanfiction, he would be very concerned. Otherwise, he would just see it as another strange aspect of the fans' creativity and leave it at that.