One common theme is political intrigue. Since they are from important families, many fanfictions involve them using their relationship to gain political advantages for their respective houses. Another theme is love against all odds, as their families may not approve or there could be other obstacles in their way.
In these fanfictions, a common theme is the struggle between duty and love. Robb has his duties to the North and Margaery has her own to Highgarden. But they also fall in love, and this creates a great internal conflict for both of them. Another theme is the power play. How their relationship can shift the balance of power between the North and the Reach. It's also common to see themes related to family honor and how their relationship might either uphold or damage it.
Well, political alliance is a big one. Their families' positions in the Game of Thrones world make it a natural theme. Also, cultural exchange can be a theme. The Starks have their Northern ways and the Tyrells are from the Reach. So, fanfictions often explore how they learn from each other's cultures. And of course, there's the theme of forbidden love. Their families' different agendas and loyalties can make their relationship seem forbidden in some stories.
Yes, there are quite a few. You can start by looking on fanfiction.net or Archive of Our Own (AO3). These platforms have a large collection of fanfictions, and you're likely to find some interesting stories about Robb Stark and Margaery Tyrell there.
Love against all odds is another theme. Since they come from different backgrounds and have different loyalties initially, many stories focus on how their love manages to grow despite all the obstacles. It could be the political unrest, family expectations, or the general chaos in Westeros that tries to keep them apart but they still find a way to be together.
In Margaery Tyrell lemon fanfiction, themes often revolve around her family's ambitions and how that impacts her relationships. Since the Tyrells are a powerful family, her relationships might be influenced by political intrigue. Also, her relationship with the Lannisters, especially Tommen, can be a central theme, with the added 'lemon' aspect perhaps exploring the more private and passionate sides of those relationships.
Political intrigue is also a big theme. Margaery is very much involved in the political games in King's Landing, and Jon has his own responsibilities in the North. Fanfictions often bring them together in the context of political power plays. They might use each other's influence to gain an edge in the complex political landscape of Westeros. Additionally, the theme of redemption can be found in some fanfictions. Maybe one of them has made mistakes in the past and the other helps them find a path to redemption through their relationship.
One common theme is power. Margaery is known for her pursuit of power in Game of Thrones, and in the fanfiction set in the Harry Potter universe, she might be after power within the wizarding world, perhaps trying to gain influence in the Ministry of Magic. Another theme could be friendship. She could form unexpected friendships with characters from Harry Potter, like Hermione, who also values intelligence and strategy.
One common theme is the clash of cultures. Since Harry is from the wizarding world of Harry Potter and Margaery is from the political world of 'Game of Thrones', their different ways of life often collide. For instance, in many fanfictions, Margaery has to adjust to the use of magic which is completely new to her.
One common theme is political intrigue. Given Margaery's role in the political world, a male OC often gets involved in the power plays and schemes alongside her. Another theme is love against all odds, as their different statuses or the complex political situation can create obstacles for their relationship.
Some fanfictions focus on Margaery's cultural influence. As a Tyrell, she comes from a rich and influential family in Westeros. So, stories might explore how she spreads the Tyrell's cultural values or how she uses her family's cultural heritage to her advantage in the political and social arenas.
One common theme is political alliance. Given their positions in the 'Game of Thrones' world, a lot of fanfics explore how their union could change the power dynamics in Westeros. For example, they could form an alliance against common enemies like the Lannisters.
Love against all odds is also a frequent theme. Given their different family loyalties and the complex political situations, their love (if it develops) is often portrayed as something that has to overcome many obstacles. For example, in some fanfics, they have to deal with family members who oppose their relationship.