past deku's classmates react to him

Yes, Deku might be telling the story in the past tense. It could add a sense of reflection or nostalgia.

Peter's classmates would react in different ways. The ones who are fans of the Avengers would be over the moon. They'd be shouting out their favorite superhero names. But there might be some who are a bit scared, especially when they see the Hulk or Thor with their big and imposing figures. And then there would be the ones who are just plain curious and would start asking a million questions.

Captain America would probably be very reflective. He might see his past self as a reminder of his long journey and how much he has changed. He could try to offer some words of wisdom to his younger self.

Sakura might be a bit worried at first. She's always been concerned about Naruto's safety, and a new weapon like Zabuza's sword could seem dangerous. But she would also trust Naruto's judgment in the end.

Others might be a bit shocked at first. But after getting used to it, they could come around. For example, they might initially tease him a little but then realize it's just Harry being Harry and trying something new.

Sakura might be a bit surprised at first but would quickly support Naruto's choice if she sees that Fem Kami makes him happy. Sasuke would probably be indifferent on the surface but secretly happy for Naruto as long as it doesn't interfere with their own goals. Shikamaru would likely think it's a troublesome situation but would also go along with it as long as Naruto is sure about what he's doing.

Naruto's outgoing and boisterous personality would make Deku more confident. He would probably be more upfront and less shy. Naruto's strong sense of justice would also intensify Deku's already existing desire to help others.

Some gods might be entertained. For instance, Hermes, being the trickster god, might enjoy seeing the different and often humorous takes on the gods in the fanfiction.

He could also be initially confused. Sasuke has known Sakura for a long time, and this unexpected act from her would leave him wondering about her motives. He may hold back his anger for a while to hear her out and understand why she did such a thing.

He would probably try to reason with the dwarves. Legolas is not one to jump into a fight immediately. He might try to explain that there is no need for such hostility and that elves and dwarves can resolve their differences in a more civilized way. If reasoning fails, he would then start to look for ways to break free from his bonds and overpower his captors using his elvish agility and archery skills.