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.
One popular 'jon snow x margaery tyrell fanfiction' is 'The Unlikely Alliance'. It weaves an interesting tale of how their paths cross in a world filled with political intrigue and magic. The story does a great job of developing their relationship gradually.
Another plot twist might be that the father of the baby is not who everyone thinks it is. It could be a secret lover, or perhaps there was some sort of magical interference that made it seem like someone else was the father. For example, if there are magical potions or spells in the fanfiction world, someone could have used one to deceive Margaery into thinking the wrong person was the father.
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 of the best qualities of Margaery Tyrell in fanfics is her intelligence. She is often depicted as very shrewd and able to navigate the complex political landscape of Westeros. For example, she knows how to use her charm and beauty to her advantage in the court.
One popular 'Harry Potter and Margaery Tyrell fanfiction' might be 'The Unlikely Alliance'. It explores a scenario where Margaery, with her political acumen from the 'Game of Thrones' world, teams up with Harry Potter in a magical adventure that combines the two universes in an interesting way.
Her pregnancy could create an alliance of sorts. Other families might see an opportunity to align with her family through the unborn child. They could offer support and protection in exchange for future favors.
It's interesting because it can explore different aspects of their characters. For example, how their relationship might change if they were in different situations, like facing a common enemy or having to make difficult decisions together. It gives a new perspective on their individual personalities as well.
There's also 'Sister's Devotion'. In this fanfiction, the author explores the emotional connection between Jon and his sister. It shows how their relationship evolves from a simple family bond to something much more profound, especially in the face of the various threats that lurk in the Seven Kingdoms.