One common theme could be the exploration of Hermione's French heritage. It might involve her having a different family background in France, with perhaps Pureblood relatives who have their own set of traditions and values. Another theme could be her interaction with the French wizarding community. Maybe she attends a French wizarding school for a while and has to adapt to different teaching styles and social norms there.
Redemption is also a theme. There are fanfictions where Bellatrix has a chance at redemption through her relationship with Hermione. Maybe Hermione sees something in Bellatrix that others don't and tries to bring out the good in her. It's an interesting way to explore the character of Bellatrix beyond her villainous role in the original books.
One common theme is the clash of cultures. Hermione, being Muggle - born, has her own set of values and beliefs which often conflict with the pureblood traditions. Another theme is her growth as a character. As she learns about pureblood ways, she becomes more understanding and adaptable. Also, the exploration of forgotten or hidden pureblood magic is a theme. For example, she might discover ancient spells or rituals.
Often, there are plotlines where Hermione as a pureblood princess has special powers or abilities that come with her status. For example, she might have an innate magical ability that is unique to pureblood princesses in the fanfiction world. This could then be used to save the day in various situations, like fighting against dark wizards or solving complex magical mysteries.
Often, these fanfictions might also focus on the flaws of Ron that are exaggerated. This is done to contrast with Hermione's pureblood - associated positive traits. It could be about Ron's insecurities being blown out of proportion, like his jealousy issues, which are then used to make Hermione look better in comparison. And sometimes, it might be about exploring how Hermione's pureblood status could have changed the power dynamics in her relationships throughout the story.
In these fanfics, a common theme is the re - writing of Hermione's social standing. Since she's now a pureblood, she might be thrust into a different social circle. This could lead to themes of social climbing or resistance to it. Another theme could be the exploration of the pureblood culture. How does Hermione adapt to the traditions, values, and expectations of the pureblood society? And of course, there's always the theme of self - discovery. As she learns about her new identity as a pureblood, she also discovers new aspects of herself, her magic, and her place in the wizarding world. It can be really fascinating to see how different authors handle these themes in their fanfics.
She might become more sophisticated in a French way. The French are often associated with elegance and a certain refined charm. Hermione could pick up some of these traits, perhaps in her speech or mannerisms. For example, she might start using more French phrases in her conversations.
Power and responsibility. Since Harry is a pureblood lord, he often has to deal with the power that comes with his new status and the responsibility to use it well. Another common theme is identity. He has to figure out how this new identity fits into his existing self.
Another character could be Blaise Zabini. He is also from a pureblood family. Fanfictions might pair him with Hermione as they explore the pureblood culture together. He could introduce Hermione to different aspects of pureblood society, and they might develop a friendship or something more as they interact.
Typically, they focus on Hermione having a pureblood princess identity. This often means exploring her family background more deeply, perhaps creating a whole new lineage for her. For example, some might give her noble wizarding ancestors.
Power and control are also common themes. Dragons are powerful creatures, so when Hermione is associated with them, the fanfictions often deal with how she manages this new power. It could be about her learning to control her dragon - like instincts or using the power for good in the wizarding world. Additionally, acceptance is a big theme. Hermione has to come to terms with being different, and the wizarding community around her has to accept this new version of her as well.