Tony could be critical if the fanfic doesn't match his view of technology in the MCU. He might say, 'This fanfic writer needs to study up on Stark Industries' tech a bit more.' Steve, on the other hand, would look for the moral and heroic elements in the story. He'd appreciate any parts that show the Avengers working together selflessly. Thor would love any parts that involve his hammer or his Asgardian heritage. He'd laugh heartily at any humorous takes on his character in the fanfic. Natasha would be looking for strong female character portrayals and any strategic elements in the plot. Clint would be glad if his character has some cool stunts or a key role in the story. And Bruce would be intrigued by how the fanfic deals with the duality of his character, whether it's in a new and interesting way or not.
One interesting plotline could be the Avengers having to deal with alternate versions of themselves that are brought into their universe during the events of No Way Home. It could lead to some really cool team - up and fight scenes.
Imagine the Avengers reading 'No Way Home' fanfiction. Loki would probably find it amusing and start plotting his own fanfiction - like twists in his head. Wanda Maximoff might be a bit emotional about it, relating to the characters' feelings in the story. Vision, on the other hand, would be trying to understand the concept of fanfiction itself and then make logical deductions about the Avengers' reactions based on their personalities.
Well, if the Avengers are watching 'Spider - Man: No Way Home' fanfiction, they might be looking for inspiration. Maybe they want to learn from the different scenarios presented in the fanfiction to better prepare for future threats in their own world. They could also be amused by the wild ideas and crossovers that often appear in fanfiction.
Some Avengers might be flattered. For example, Peter Parker's interactions with the Avengers in the 'No Way Home' movie are complex. In the fanfic, if those are explored well, they could be happy. Like, Doctor Strange in the fanfic might be glad if his magic is shown in a cool way.
Tony Stark could also be a key figure in some fanfics, even though he's no longer alive in the main MCU timeline. His intellect and previous experiences with multiversal - related events (like in Endgame) could be explored in the fanfic. Maybe the Avengers find a way to access his knowledge or even a version of him from another universe to help them out.
It gives fans a chance to explore different 'what - if' scenarios. By seeing the Avengers' reactions, fans can get a deeper understanding of the characters.
It could be Iron Man. Since he was always the brains behind a lot of the Avengers' tech and strategies, he might be the one analyzing every detail in the trailer and coming up with plans.
He might also get angry. Peter has a strong sense of justice. If he feels that the Avengers are being unfair, he could stand up to them. He'll use his quick wit and his powers to show that he's not going to be pushed around easily.