Yes, there might be such fanfictions out there. Fanfiction platforms are filled with all sorts of creative and unique crossovers. You can try searching on major fanfiction websites like Archive of Our Own or Fanfiction.net. However, the quality and content can vary greatly from one story to another.
Well, you can expect a lot of cultural clashes and fusions. Itachi's ninja upbringing and the magic of the female Harry Potter would create an interesting dynamic. There might be scenes where they try to understand each other's worlds, like Itachi being amazed by magic spells and the fem Harry Potter being intrigued by ninja techniques.
One great fem Harry Potter Itachi Naruto fanfiction is 'The Crossover Adventure'. It combines the magical world of Harry Potter with the ninja world of Naruto and throws in Itachi's complex character. The story follows a female version of Harry Potter who somehow gets transported to the Naruto universe and meets Itachi. It's really interesting to see how the different elements from each series interact.
Well, in 'naruto marries fem itachi fanfiction', a recurring theme might be the exploration of family. Naruto has always longed for a family, and a relationship with fem Itachi could lead to the creation of a new family unit. This could involve dealing with the reactions of their friends and the village. Also, the theme of sacrifice might be present. Given their roles in the Naruto universe, they might have to sacrifice things for each other or for the greater good of the village, which adds depth to their relationship in these fanfictions.
The exploration of different universes is also a top element. These fanfictions often take the time to describe both the magical world of Harry Potter and the ninja world of Naruto. We get to see how the cultures, rules, and social structures of these two worlds are different and yet can somehow co - exist when the characters cross over. This gives a lot of depth to the stories.
Well, it depends on how the fanfiction writer envisions it. If Harry Potter marries fem Peter, perhaps they would start a new family tradition that combines the best of both of their worlds. For example, their children could inherit both magical abilities and some special trait from fem Peter's side. It could also mean a whole new social dynamic in the wizarding community as they introduce a different kind of relationship.
Well, in such a fanfic, the fem Harry Potter might be on the run from some dark wizards and accidentally end up in the Naruto universe. Naruto rescues her from an initial danger. They start to train together, with her teaching him some basic magic and him teaching her ninja moves. As their bond grows stronger, they fall in love. For their marriage, they have to find a way to combine the traditions of both their worlds, which is no easy feat. There are also antagonists from both universes who try to stop their union because they fear the power they would have together.
One possible plotline could be that through some magical accident or portal, Harry Potter (as a female in this fanfiction) ends up in the Naruto world. There, she meets Kakashi and they start off as friends but gradually fall in love. Another could be that both worlds somehow merge, and Kakashi and fem Harry are brought together due to their shared sense of duty and protectiveness over their respective worlds.
If Harry Potter marries fem Peter in fanfiction, the story could develop with them building a new home together. They would have to decorate it with elements from both of their worlds. And in terms of the plot, they could be drawn into a mystery that is related to their combined heritage. Maybe there are ancient artifacts that only they, with their unique relationship, can unlock. Their friends from both sides would also play important roles, some helping them, some being skeptical at first but then coming around.
I'm not sure of a specific one off the top of my head. But you can try searching on fanfiction websites like Archive of Our Own or FanFiction.net. Just type in the relevant keywords and browse through the results.