I'm afraid I don't know the author of this 'peter is forgotten fanfiction'. It could be an amateur writer just starting out in the fanfiction world or someone who has been writing for a while but remains relatively unknown. To find out, one might need to search on popular fanfiction websites, but even then it could be a challenge.
I'm not sure specifically as there could be many interpretations. It might be a fanfiction where the character Peter is somehow forgotten by the other characters in the story's world. Maybe he's left out of important events or relationships and the fic could explore his feelings of isolation or how others react to his absence.
One great forgotten Peter Parker fanfiction is 'The Lost Spidey'. It delves into a scenario where Peter is forgotten by his friends and the city he protects. The author does an amazing job of exploring Peter's isolation and his struggle to regain his place. Another is 'Forgotten Hero', which focuses on how Peter copes when his identity as Spider - Man is completely wiped from people's memories. It has some really interesting character development.
One idea could be that all of Peter's friends are so caught up in fighting crime and their own lives that they completely forget his birthday. Peter feels really down about it at first but then realizes that his real purpose is to be Spider - Man and save the city, not focus on a birthday celebration.
The concept of a forgotten Peter Parker is captivating because it plays on our emotions. We know Peter as this beloved hero, so seeing him in a situation where he's forgotten makes us feel sympathy for him. It also allows for a lot of interesting plot twists. For example, he might have to re - earn the trust of his friends or the city.
Well, he might go through the day feeling really sad and neglected. Maybe he'd see other people celebrating birthdays and it would make him feel even worse. He could start doubting his relationships with his friends and family.
One possible plot could be that after an incident, perhaps a spell gone wrong or some kind of memory - wiping event related to Tony's tech. Peter Parker is erased from Tony's memory. Peter, who considered Tony a mentor, is heartbroken when he realizes Tony doesn't recognize him. He tries to jog Tony's memory by showing up at the Stark Tower with his Spider - Man suit, but Tony just sees him as a random kid in a strange costume.
One great 'Peter Parker forgotten fanfiction' could be about Peter losing his memories and having to rediscover his powers and his identity as Spider - Man in a completely new way. Maybe he wakes up in a strange place with no recollection of his life before and has to rely on his instincts and the help of some unexpected allies.
You can start by looking on popular fanfiction websites like Archive of Our Own (AO3). It has a vast collection of fanfictions, and you can use the search function to look specifically for 'Peter Parker forgotten fanfiction'. Just type in the relevant keywords, and it should bring up relevant stories.
It could be Mysterio. He's always been jealous of Peter's connection to Tony. He uses his illusions to mess with Tony's mind and make him forget Peter. Mysterio wants to be the one in the spotlight and sees Peter as an obstacle, so by making Tony forget him, he can get rid of Peter's influence on Iron Man.