There's a fanfic titled 'Robb Stark's Sister: A Tale with Theon'. In this one, the female Robb Stark character is really strong - willed. She has her own ideas about the future of Winterfell and her relationship with Theon is full of twists and turns. The author does a great job of showing how their different backgrounds shape their interactions. It's an interesting read if you like character - driven stories.
One consequence could be a shift in the power balance. The Mountain was a powerful fighter in service of certain lords. His death would leave a power vacuum among his allies. Robb Stark, on the other hand, would gain more notoriety. His reputation as a fearsome and capable leader would spread, making his enemies more cautious of him.
Well, in the fanfiction world, Robb Stark might also get some unexpected help. Maybe there are some magical elements involved. A wizard or a sorceress could weaken the Mountain's strength or defenses. This would give Robb an edge in the fight. Then, with his courage and fighting skills, he could step in and slay the Mountain.
The Old Gods themselves would be crucial. They could be represented in various forms like the weirwood trees. And there might be some sort of priest or seer who serves as an intermediary between Robb and the Old Gods, guiding him through the spiritual experiences.
You can start by looking on Archive of Our Own (AO3). It has a vast collection of Game of Thrones fanfictions, and there are likely to be many that feature a female Robb Stark and Theon. Just use the search function and type in relevant keywords like 'female Robb Stark' and 'Theon'.
Another theme could be a romantic relationship. Some fanfictions might develop a love story between them, which often includes elements of forbidden love as their families and loyalties are complex in the original 'Game of Thrones' context. It can be interesting to see how the writers navigate this.
One common theme is the clash of different cultures. Harry Potter's world is full of magic and wizardry, while Robb Stark's is a medieval, feudal society. So, stories often explore how the two worlds collide and interact. For example, how magic is perceived in a world that has no prior knowledge of it.
There are indeed. A lot of fanfiction writers like to reimagine the characters. In some stories, a female Jon Snow and Robb Stark might have different dynamics. Maybe they have more emotional conversations about their family and the future of the North. It can be really fascinating to see how the gender swap changes their interactions and the plot development.
A sense of adventure is also present. They were in the middle of a war - torn Westeros. Fanfictions might take them on different adventures together, away from the main battles, or they could be involved in secret missions that test their relationship. Also, the theme of loyalty, both to each other and to their respective causes, is explored. How they balance their loyalty to each other with their loyalty to their families and kingdoms is a rich area for fanfiction writers.