Who could be the main villain in a 'Peter Parker forgotten by Tony fanfiction'?

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.

The Green Goblin could be a great main villain. He might target Peter Parker's daughter to get revenge on Spider - Man. Just like he did with Gwen Stacy in the original story, he could pose a serious threat to her.

One possible main antagonist could be a villain who is jealous of Tony's resources and sees Peter as a way to get to him. Maybe someone like Justin Hammer, who could try to manipulate Peter into betraying Tony and Steve.

The Vulture could also be a main villain. He might have a new technology that he believes can only be perfected with the DNA of Peter and Gwen's child. He stalks the family, waiting for the perfect moment to strike and snatch the child away for his evil experiments.

One possible main villain could be Mysterio. He could use his illusions to create chaos in the superhero high school and try to frame Peter Parker for it. Kingpin could also be a good choice. He might see the superhero high school as a threat to his criminal empire and try to take it down. And then there's Electro, who could be causing power outages in the school and endangering everyone.

There could also be other characters like Happy Hogan. He might play a role in helping Tony take care of Peter, like driving him to school or keeping an eye on him when Tony is busy. And perhaps Aunt May could still be in the picture, adding an interesting layer to the story as she and Tony interact regarding Peter's upbringing.

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.

Yes, there are likely some fanfictions out there with this premise. Fanfiction often explores unique and unexpected relationships between characters. Writers might create a scenario where Peter Parker is scared of Tony Stark for various reasons, like Tony's power, his temper, or some miscommunication between them.

The AI itself could be a main character. It could have a name like Nova or something cool. And then there could be Peter's aunt May, who might be involved in the story when she discovers Peter's AI project and has some concerns about it at first but then comes to see its potential.

In some fanfictions, Zemo - the one who originally stirred up trouble in the movie Civil War - could still be a major antagonist. He might target Peter specifically to get to Tony or use Peter's inexperience against the heroes.