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.
There's also a fanfic called 'Aegon and Margaery: A New Alliance'. In this one, they team up to face common enemies. It has some really interesting plot twists and the way it portrays their individual motives and how they come together is quite engaging. It shows how their different backgrounds in the Targaryen and Tyrell houses can either clash or complement each other.
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.
There might be a fanfiction where Margaery Tyrell forms an unexpected alliance with a Targaryen. For example, she teams up with a Targaryen princess to bring about some sort of reform in Westeros. They face many challenges together, like opposition from other houses and internal power struggles within the Targaryen family.
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.
One common theme could be power struggles. Given Aegon II's position in the Targaryen dynasty, fanfics often explore how he vies for and holds onto power. Another theme might be family drama, as the Targaryens are known for their complex family relationships. There could also be themes of loyalty and betrayal, with characters choosing sides between Aegon II and other claimants to the throne.
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.
Some Reddit communities dedicated to Game of Thrones or the relevant characters might also be a good source. Members often share links to interesting fanfiction they've come across. You can join these communities and ask for recommendations specifically for Margaery Tyrell of Targaryen fanfiction.
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.