Perhaps there is a plotline where the family is in danger, and both Tony and Percy have to combine their skills, Tony's scientific skills and Percy's magical abilities, to save the day. Or it could be about Percy going to live with Tony for a while and the culture shock that follows for both of them.
Well, in fanfiction, anything can be made possible. Maybe in this particular story, there could be some sort of hidden family connection. Perhaps Tony Stark's family has some long - lost relation to Percy Jackson's family that was never known before. It could be a really creative and out - of - the - box concept that the author uses to bring these two very different universes together.
One possible plotline could be Tony as a panther facing off against some kind of threat to his territory. Maybe there are other supernatural creatures trying to encroach on his space.
One possible plotline could be that Bernardo gets into a dangerous situation, like being trapped in a burning building, and Tony risks his life to save him. Maybe there's a feud between their groups, but Tony's sense of justice or his personal feelings for Bernardo override that.
One possible plotline could be that Mantis and Tony meet during a battle and Mantis uses her empathic abilities to understand Tony better than anyone else. This could lead to a deep friendship or even a romantic relationship.
It could be that Tony is under some sort of mind - control or influence that makes him cheat on Pepper. Then the story might focus on Pepper's journey to break the control over Tony and save their relationship.
Maybe in some 'wanda hurts tony fanfiction', it's more of an emotional hurt. Wanda could accidentally reveal some of Tony's deepest secrets or traumas, causing him mental anguish. This could lead to a rift between them and the other Avengers having to deal with the fallout.
One possible plotline could be the daughter inheriting Tony's genius and getting involved in some high - tech project at a young age. For example, she might build her own mini - Iron Man suit.
One possible plotline could be that Bucky is trying to teach Tony a lesson in a very unorthodox way because Tony has made a mistake that could endanger the whole team. Maybe Tony's reckless behavior in a mission led to some serious consequences, and Bucky, as a more experienced and strict figure, decides to use this rather extreme method to make Tony realize his error.
Maybe in the fanfiction, Tony discovers Peter's potential not just as Spider - Man but also in other areas like science. So he starts mentoring Peter more intensively, leading to a closer father - son type of relationship. They could work on new inventions together, with Peter learning a great deal from Tony's experience.
Perhaps Pepper, in an attempt to protect Tony from himself, takes extreme measures. For example, she could sell off Stark Industries' technology that Tony was using for his Iron Man suits without his consent. This would be a huge betrayal in Tony's eyes as his technology and the Iron Man identity are so closely tied to him. It could lead to a rift between them that is difficult to mend as Tony feels violated and Pepper believes she was doing the right thing to keep him safe.