Maybe the Stark is sent on a diplomatic mission to Rhaenyra's court. This would give them a chance to interact and get to know each other. As they discuss politics, they start to develop feelings for each other. Their initial meetings would be formal, but over time, the formality would fade and a deeper connection would form.
It's possible that they meet in the North. Rhaenyra could be traveling for some reason, perhaps to seek an alliance. She gets lost in a snowstorm and is rescued by the Stark. This would be a very romantic way for them to meet. He takes her to his castle, and they start to bond over the Stark family's hospitality and the unique culture of the North.
They could meet at a grand tournament. Tournaments are common in the Game of Thrones world and attract nobles from all over. Rhaenyra could be there representing her house, and the Stark could be there to prove his worth. They might catch each other's eyes during a joust or some other event.
He would surely meet Black Panther. As the king of Wakanda, Black Panther would be the first and most important person Tony Stark would encounter.
One possible plot twist could be that the Stark she marries has a secret power or ability. Maybe he can communicate with animals like some Starks in the lore. This would add an interesting dynamic to their relationship as Rhaenyra comes from a different world in terms of magic and abilities. It could also lead to political intrigue as other houses might be jealous or fearful of this union and the new powers it could bring.
There could also be a scenario where the Avengers travel back in time to seek Howard Stark's help. Maybe they need his unique insights on some ancient technology or a threat that has roots in his era. So they go back in time and encounter him.
They would be all over him! Steve would probably have a big, warm smile on his face and just be in awe of how small and precious he is. Clint would make silly faces to make the baby laugh. Bruce might be a bit more cautious at first, but then he'd be charmed by Peter's little giggles.
The challenges would be many. Politically, their marriage would be a strange alliance. The Starks and Lannisters have different agendas. Ned would want to rule justly and fairly, while Cersei is only interested in power for herself and her family. Emotionally, they are polar opposites. Ned is a loving father and a man of principle. Cersei is a complex character, often driven by jealousy and greed. Her relationship with Jaime is a major hurdle. And Ned would have a hard time trusting Cersei, given her reputation for underhandedness. Their marriage would be like mixing oil and water in the world of fanfiction.
The relationships would change in multiple ways. Rhaenyra would need to earn the trust of her siblings as their new guardian. There could be some jealousy or resentment from her siblings at first, especially if they were used to more freedom. However, as time passes, they would grow closer. Rhaenyra would also have to deal with any rivalries between her siblings. She would need to be fair and just in her treatment of them, which could either strengthen or strain their relationships depending on how well she manages it.
Since he might be related to Tony Stark, there could be an emotional connection for the other Avengers. They might feel a sense of obligation to protect him or guide him, which changes their group dynamic. For example, Captain America might take on a more father - figure role towards Peter. Also, his presence could create some jealousy or competition among the Avengers who want to be his mentor or closest ally.
Before the marriage, Naruto might first develop a friendship with Fuu. She is a spunky and independent character. Then, as Naruto also gets to know Yugito better through joint missions and diplomatic encounters between their villages, he starts to feel a connection with her as well. Fuu and Yugito, initially a bit jealous of each other's closeness to Naruto, would eventually realize that they can all be happy together. They would then start to build a relationship based on mutual respect, love, and the shared goal of making the ninja world a better place.
They could start off a bit awkwardly. Tony might not know how to act like a father since he's just meeting her at this point. But over time, they'd bond over things like their shared intelligence. They could work on projects together, like building a new type of Iron Man suit or something related to clean energy.
Their meeting could also mean that Fleur might be more protective of Harry at Hogwarts. Since she knew him before, she might feel a sense of responsibility. So, during the Tournament, she could offer him some tips or help in a more discreet way, which could change the dynamics of how the Tournament unfolds for Harry.