Well, some might be really amazed. They could see a new side of Deku that they never knew before. His singing might show a different level of confidence or a hidden talent, so they would probably cheer him on.
I think Uraraka would be very excited. She has always been a big supporter of Deku. Meeting Future Deku would give her a chance to see how far he has come, and she might also get some inspiration for her own hero journey. Plus, she's a friendly and emotional character, so she'd likely be thrilled at the opportunity.
Maybe in this fanfiction, Class 1 - A is on a training mission when they accidentally stumble into a time - warp and meet Future Deku. Future Deku could be a super - powerful hero, and he starts to train them in advanced techniques that they haven't learned yet. He might also share some of his future experiences with them, like the battles he has won and the villains he has faced, which would inspire Class 1 - A to strive harder in their hero training.
Bakugo would likely be furious. He'd feel betrayed and would probably be the first to attack Deku, yelling at him about how he's thrown away everything they've worked for. Uraraka might be more empathetic. She'd try to understand what drove Deku to become a villain and hope there's a way to bring him back to the side of good.
A great Deku and Eri fanfiction could be set in a future where Eri has grown up a bit. She and Deku go on a mission together to rescue some hostages. Deku is proud of how far Eri has come and they work together as a great team.
The theme of family or a found family is also common. Deku and Eri can be seen as forming a sort of family unit. Deku takes on a big - brother or father - like role for Eri, and they develop a deep bond that is similar to what one would find in a family.
It could be about how the 78th class in a particular fictional universe reacts to future events. Maybe they face new threats, technological advancements, or social changes. For example, if it's a superhero - themed universe, they might have to deal with more powerful villains in the future. They could also be reacting to changes in their own relationships within the class.
Some Tumblr blogs are dedicated to sharing and recommending fanfiction. You could search for My Hero Academia fanfic blogs and then look specifically for Deku and Eri stories. They might also have reviews or summaries to help you decide which ones to read.
The main characters could also be a combination of students with different abilities or skills. In a world where they need to react to the future, someone with technological know - how, another with physical strength, and a third with great strategic thinking could all play important roles in how the 78th class as a whole responds.
Deku might be completely shocked at first. Since Bakugou has always been so aggressive towards him, he would never expect such a confession. He might just stand there, mouth agape, not knowing what to say.