What could be the plot of a Harry Potter and Sansa Stark fanfiction?

Well, a common plot point is the culture shock. Sansa, coming from a medieval - like world of Westeros, experiences the modern - ish (in a magical sense) world of Harry Potter. She might be shocked by things like the moving staircases or the talking portraits.

One common theme is the clash of different cultures. Sansa from the medieval - like world of Westeros and the magical world of Harry Potter. Another could be the idea of power, as both universes deal with different forms of it.

Yes, there are quite a few. You can start by looking on fanfiction websites like Archive of Our Own. Just search for 'Harry Potter Sansa Stark' and you'll find a variety of stories that blend the two universes in interesting ways.

Maybe Harry travels to the Marvel universe and tries to learn from Tony Stark. He could be interested in Stark's technology for some reason related to fighting Voldemort, like using it to detect Death Eaters.

One possible plot could be that Jon and Sansa's union is a political move at first, but then they truly fall in love. When Sansa becomes pregnant, they face opposition from other houses who fear their combined power. They then have to fight to protect their family and the future of their child.

At first, Sansa might be a bit intimidated by Harry's status as a hero in the wizarding world. But she would quickly regain her composure and start to assert herself. Harry would respect her for that. They could interact in a way that combines their different skills. For instance, when facing a problem in the wizarding world that has elements of political intrigue, Sansa could step in and offer her insights, while Harry uses his magic to deal with the more dangerous magical aspects. Their conversations would be a blend of Sansa's refined language from Westeros and Harry's more modern wizarding world speech.

Well, perhaps Harry Potter uses his magic skills like the Patronus charm to fend off the enemies who are about to harm Ned Stark. He could apparate Ned to a safe place just in time.

One plot idea could be that Tony Stark somehow travels to the wizarding world. He could use his technological knowledge to improve the wizarding devices. For example, he might make brooms fly faster with some kind of engine modification.

Perhaps the plot could start with their unusual upbringing. Harry grows up with the Dursleys while Tony has his own issues with his father. They both develop their unique skills. When they meet, they realize they are brothers. They then start to combine magic and technology. For example, they could use magic to enhance Tony's suits or use technology to create new magical artifacts. Along the way, they face challenges from those who oppose the mixing of these two very different worlds, like some traditional wizards who don't trust technology and some tech - moguls who fear magic.

There are some fanfictions where Harry Potter and Sansa Stark meet through some magical portal. In these stories, Sansa is often amazed by the magic in the Harry Potter universe, and Harry is intrigued by Sansa's strong will and the different kind of courage she has developed in a world without magic but full of political intrigue.