They might be really surprised. Some characters could be flattered by the positive portrayals in the fanfiction, while others might be a bit annoyed if their personalities are misrepresented. For example, Deku might be shy but also happy to see new interpretations of his growth journey.
I'm not sure exactly what you're asking. If you mean whether Class 1 - A in 'My Hero Academia' could be depicted as watching fanfiction in fan - made stories, it's possible. Fanfiction often takes creative liberties with the existing characters and their actions.
Perhaps Class A would be quite intrigued when watching 'My Hero Academia' fanfiction. They could see how fans outside their universe view their powers, relationships, and adventures. It might even inspire them in some ways.
Shigaraki would likely be disgusted if the fanfic made him seem weak or less of a threat. He'd probably scratch at his neck in irritation. Dabi would be dismissive. He'd think fanfics are just a waste of time and not worthy of his attention. Toga, though, might be intrigued. If the fanfic had a lot of blood and gore in it, or if it focused on her relationships in an interesting way, she could be really into it.
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.
Some characters might be intrigued. For example, Izuku Midoriya would probably be very interested in understanding how the Gamer Sparda powers work. He would see it as a new type of quirk to study and might try to find ways to incorporate the strategies used in the 'game' aspect into his own hero training.
I really like 'Class 1B's Secret Missions'. In this fanfic, Class 1B gets assigned some special and secretive missions that are different from what Class 1A usually does. It shows their teamwork and how they use their individual quirks in creative ways to complete the tasks. It's full of action and some really interesting character development.
Well, for Class 1a watching a My Hero Academia fanfic, Mina would be the one who gets really into it and starts discussing it with everyone. She'd be all excited, sharing her thoughts on the cool quirks and relationships in the fanfic. Iida, on the other hand, might be a bit more critical. He'd be thinking about whether the fanfic follows the proper 'rules' of their world and if it has any educational value.
To write a fanfiction about a My Hero Academia OC in a class, start with a strong concept for your OC. Let's say your OC has a quirk called 'Sound Mimicry' where they can imitate any sound they've heard. They enter the class and immediately face the challenge of standing out among so many unique quirks. You can write about their first day in class, how they introduce themselves, and how the other students react. As the story progresses, you can create story arcs for them. Maybe they get involved in a tournament and have to use their quirk in creative ways to win. Along the way, develop their relationships with the teachers and classmates, like forming a friendship with Ochaco or getting mentored by Aizawa.
One way to create an OC for My Hero Academia's class is to first think about their quirk. For example, a quirk like 'Shadow Manipulation' could be really cool. The OC could be a bit of an outcast at first because their quirk is seen as a bit spooky. They might have a troubled past that led them to UA. They could be really good at stealth and use their quirk to move around undetected in the shadows, which would be useful in combat situations and also for sneaking around the school when they're not supposed to.