You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of My Hero Academia fanfictions, and you're likely to find some great 'class 1a meets manga deku' ones there.
There's also 'When Class 1a Meets Manga Deku'. This fanfiction focuses on how the students of class 1a react to a Deku who has all the powers and abilities as depicted in the manga. It shows their initial shock, followed by their attempts to work together with this new version of Deku. The story also delves into the relationships between the classmates as they face various challenges.
His classmates would probably be very concerned. Some might immediately run to get the teacher or the school nurse. Others might gather around Peter, asking if he was okay and trying to comfort him.
Peter would probably be shocked at first. I mean, getting a call from Deadpool in the middle of class is not an everyday occurrence. He might quickly look around to see if anyone noticed his phone ringing.
Peter could also be very nervous. He's still a young hero and being called by the Avengers in such a public setting like in class could make him feel self - conscious. He might stutter when he tries to answer their call and fumble with his things as he gets ready to leave. He'd be thinking about all the possible things they could need him for and whether he's really up to the task while also dealing with the eyes of his classmates on him.
Issei could be a bit nervous at first. He might worry about what his classmates will think. But if they show positive reactions, he could become more confident and start sharing more about his writing. However, if they react negatively, he may feel a bit down and might even regret that they saw it.
Some students in Peter's class might be really excited as they get to see new takes on their favorite movie. Others could be a bit confused if the fanfiction is very different from the original story.
Peter could also be a bit annoyed if it's not a good time. For example, if he was really focused on a test or a lesson he was interested in. But still, he'd probably answer because he knows Natasha wouldn't call without a good reason. He might give her a look that says 'this better be important' while trying to listen to what she has to say.
The main differences are in their expressions and some minor details of personality. In the manga, Deku might seem a bit more intense, while in the anime, he's sometimes presented a bit softer.
Well, obviously Deku in two forms - the younger and the older version are the main characters. The younger Deku is the one who is still growing and learning, while the older Deku has more experience.