Adding Aunt May to the mix can bring in a whole new level of drama. She loves Peter dearly and might be a bit overprotective. When she realizes the extent of Tony's influence on Peter and the dangerous world of superheroes that Tony is part of, she could have some serious confrontations with Tony. Also, villains like the Vulture can be included not just as the bad guys in action scenes, but also as a source of drama. For example, if the Vulture targets Peter specifically because of his connection to Tony, it adds an extra layer of danger and drama to their father - son relationship.
Nick Fury is an interesting character to include. He might try to use Peter's relationship with Tony for his own S.H.I.E.L.D. purposes. This could put Tony in a difficult position, as he wants to protect Peter but also has to deal with Fury's demands. And then there's Rhodey. He could be jealous of the attention Tony is giving to Peter, thinking that Tony should focus more on their friendship or on Iron Man - related matters. His presence can stir up some internal conflicts within Tony and also create drama between him and Peter.
Pepper Potts could be a great addition. If she's initially hesitant about Tony taking on Peter as a sort of surrogate son, it can create a lot of drama. Maybe she's worried about the danger Peter could bring into their lives. Another good character is Happy Hogan. He could be the voice of reason, sometimes agreeing with Pepper, other times seeing the potential in Peter and siding with Tony. This can lead to some interesting arguments between the characters.
Another theme is family and belonging. Since Peter doesn't have a father figure in the original story in the same way, fanfictions explore how Tony fills that role and how Peter finds a new family in Tony. It's about creating a sense of home and acceptance between them. For example, in many fanfictions, Tony provides a stable home environment for Peter which he was lacking before.
I think Rhodey would be a likely character. He was Tony's close friend, so he would be involved in verifying Peter's claim and guiding him. Also, Aunt May could play an important role. She has raised Peter and now has to come to terms with his new identity. And there could be some other Avengers like Natasha or Clint who knew Tony well and could offer their perspectives on this new family revelation.
There could be a plot where Tony's past mistakes come back to haunt him, and he's worried about how it will affect Peter. He might try to distance himself from Peter to protect him, but Peter doesn't understand and feels rejected. This would lead to a rift between them. However, in the end, they would reconcile as they realize how much they mean to each other as father and son.
Often, Peter is really well - written. Writers can capture his naivete and his eagerness to learn and do good. His internal struggle between being a normal kid and a superhero is very engaging.
Including other demigods from different camps can bring in new dynamics. A demigod from the Athena cabin, for instance, could offer their wisdom and strategic thinking. Or a child of Ares who might be more impulsive and aggressive, creating tension within the group. This mix of different personalities and powers can make for a very engaging fanfiction.
Peter would likely be in awe of everything and constantly asking Tony questions. Tony, in his father - son role, would patiently answer, with a bit of his usual sarcastic charm. For example, if they see a new piece of tech, Peter would say 'Mr. Stark, how does this work?' and Tony would reply 'Kid, if I told you all my secrets, where would the fun be?'
One plot idea could be that Tony discovers Peter has a hidden talent for advanced robotics engineering that he's been too shy to show. So, Tony takes Peter under his wing to develop this talent further. Another could be that Peter gets into some kind of trouble at school related to his superhero identity, and Tony has to step in as a father figure to help him out. Maybe Peter accidentally reveals his powers in front of some untrustworthy people at school, and Tony has to deal with the potential exposure.
A key element is the mentorship aspect evolving into a father - son bond. Tony guiding Peter in his superhero journey, like teaching him combat strategies or how to use advanced technology. Another element is the emotional connection. For instance, Peter looking to Tony for approval and Tony feeling a sense of pride when Peter succeeds.
There's also 'The Mentor and the Protégé'. In this fanfiction, Tony takes Peter under his wing not just as a superhero training him, but as a father would. It shows how they deal with the loss of loved ones together and how that strengthens their connection. It's really heart - warming.
Definitely Mary Jane. She could be his biggest supporter in his ballet journey, coming to his shows and helping him practice when he's feeling down. Another great character would be Ned. He could be the one who accidentally discovers Peter's ballet hobby and is really intrigued, maybe even helping Peter come up with ways to keep it a secret from others.