A more complex plot could involve a villain from Agent Carter's time who has been in stasis or something similar. When they wake up in the Iron Man era, they start causing chaos. Tony and Peggy (either through time - travel shenanigans or her being revived in some way) have to team up to stop this villain. Their different fighting styles and technological know - how would make for an interesting dynamic.
Another idea is that Agent Carter is somehow brought to the modern era where Iron Man exists. She could be a bit of a fish out of water, but her old - school skills and no - nonsense attitude could help Tony Stark in a crisis situation. Maybe she has a different perspective on some of the modern technology that he's created and offers some unique solutions.
There's no official indication in the Marvel canon that Agent Carter would watch Iron Man fanfiction. She comes from an earlier era in the Marvel universe and is focused on her own adventures and the world around her at that time.
Another plot could involve Peggy accidentally traveling to an alternate timeline. In this timeline, SHIELD has become an evil organization. She has to team up with alternate versions of her friends and allies to set things right. This would be a great opportunity to explore different character personalities and relationships in a new context, as well as have some intense fight scenes and strategic planning.
One idea could be a crossover with the Avengers. Agent Carter could be brought into the modern day through some time - travel mishap and have to work with the Avengers to stop a new threat. Maybe she'd use her old - school spy skills and charm to get the team in line.
Well, if Agent Carter were to read Iron Man fanfiction, it would be an interesting clash of two different eras of the Marvel universe. She might find some of the ideas in the fanfiction fascinating, like the advanced technology Iron Man uses. But at the same time, she would likely be a bit put off by the more outlandish elements. And perhaps she would start to think about how the world has changed from her time to the time when Iron Man exists in the fanfiction, and how different their approaches to heroism are.
One idea could be to explore his origin story in more depth. Maybe he has a hidden family or a past trauma that shaped him into the man of iron. Another could be to put him in a different time period, like the future where technology has advanced even more and he has to adapt.
Some fanfiction platforms might have specific collections dedicated to this crossover. FanFiction.net could also be a good bet. You might have to dig a bit deeper by using the search function and looking for stories that mention both Agent Carter and Iron Man in the summary or tags. Usually, the more popular ones will have a higher rating and more reviews, which can be a good indicator of quality.
In some Iron Man harem fanfiction, it could be that Tony Stark is transported to an alternate dimension where the rules of relationships are different. There, he finds himself surrounded by female characters who are all vying for his attention. The story could explore how he navigates this new world and these new relationships while still trying to be the hero he is.
Well, a plot idea could be that in the fanfiction, the events of Iron Man 3 somehow get re - written in a way that Tony Stark's suits in that movie have a different origin. For example, they were actually created by an ancient civilization that he discovers accidentally, and this new knowledge ties into the Avengers' overall story arc. Also, we could have a story where the Extremis virus from Iron Man 3 spreads in a different way and starts to affect some of the other Avengers. This would force Iron Man to not only deal with his own problems related to the virus but also find a cure for his teammates. And then there's the idea of a parallel universe where Iron Man 3 never happened as we know it, but the Avengers are still dealing with the consequences of a similar threat, and they have to rely on Iron Man's knowledge from that 'alternate' Iron Man 3.
One idea could be Jarvis getting a physical form and having to learn how to interact in the real world like a human. He could struggle with emotions and social cues, creating humorous and touching moments as Iron Man tries to guide him.
A plot could also revolve around a time when Rescue's identity is compromised. Iron Man has to protect her while also trying to figure out who is behind the leak. They go on a journey that takes them to different parts of the world, facing various threats along the way. This would test their relationship and their ability to trust each other in difficult situations.