In other 'Peter Parker death fanfiction', his final moments are full of regret. Maybe he made a mistake that led to his death, like trusting the wrong person or not being strong enough at a crucial moment. His last thoughts could be about how he could have done things differently to avoid this tragic end.
Writers often depict Peter as frustrated. He's used to being active and helping people, so being injured and sidelined makes him feel useless. He might lash out at his friends in the Avengers out of this frustration.
One aspect could be the emotional impact. Fans often have a strong connection to Peter Parker. His death in fanfiction might be a way to explore grief and the aftermath among the other characters in the Spider - Man universe. It could also be a means to create a new narrative direction, like how the remaining characters step up in his absence.
In some fanfictions, the moment when Peter saves a large number of people from a major disaster is a key moment in his transformation. He sees the impact he can have on so many lives, and this gives him the confidence and determination to fully embrace his role as a hero. He realizes that he has the ability to make a real difference in the world.
Often, the fanfiction shows Tony providing for Peter. This could be in terms of financial support, like buying him new suits or funding his school projects. He also gives advice on superhero stuff, like how to fight villains better.
Often, it shows his growth in terms of technical skills. With the resources and mentorship at Stark Industries, Peter becomes more proficient in building and modifying his gear.
In some fanfictions, Peter's parents' death is portrayed as a conspiracy. There could be a secret organization behind it, adding more intrigue to the story.
In some fanfictions, Peter Parker's attempts at normal teenage life while being Spider - Man lead to hilarious situations. For example, he might be in a hurry to change into his suit for an emergency, but he accidentally puts his suit on backwards. Or there could be a moment where he's trying to keep his identity a secret from his friends during a school play. He's so focused on not revealing himself that he forgets his lines and starts ad - libbing in a really goofy way that has the whole audience laughing, thinking it's part of the act.
Peter will probably be very confused at first. He's used to being part of the team, and suddenly being hunted by them is a huge shock. He might try to talk to them to clear up any misunderstandings.
Some of his minor enemies might see this as an opportunity to strike. They could think that a sick Peter Parker is an easy target. For example, Flash Thompson might try to bully him more than usual, not knowing that even sick, Peter has his powers.
It would deeply affect Tony Stark. Tony has been like a mentor to Peter, so his death would be a huge blow. Tony might blame himself for not being able to protect Peter.