Well, often she's depicted as having a deeper knowledge of Hogwarts' history. Since she's the heir of the founders, she may discover long - lost spells or enchantments that were created by the founders themselves. This knowledge could put her in a position of great power and responsibility. She might use it to protect Hogwarts from new threats, like dark wizards who are trying to undermine the school's magic. And it can also make her a target, as there are always those who would seek to use her power for their own evil ends.
Another antagonist could be a dark wizard or witch who wants to use the power associated with the Founders' heir for evil. They might target Hermione to either force her to join them or to extract the power from her. This antagonist would likely be very powerful and have a network of minions to carry out their plans.
Hermione's love for learning and discovery. The founders were great scholars and innovators. Hermione shares this passion. She's always eager to dig deeper into magic, whether it's in the library or through her own experiments. This similarity makes her a believable heir in fanfiction. She has that same thirst for knowledge that the founders had, and it could be part of her heritage as their heir.
One common theme is time - travel. Often, Harry and Hermione are sent back in time to interact with the founders. Another theme is the sharing of modern magic knowledge with the founders. For instance, they might introduce spells that were developed later. Also, the theme of changing the course of Hogwarts' history is quite common, like influencing the house system or the way magic is taught at Hogwarts.
In many of these fanfictions, Hermione starts off as her typical, studious self. But as she interacts with the founders, she becomes more adaptable. She has to quickly learn to deal with the different magical practices and social norms of the founders' time. This forces her out of her comfort zone and makes her more flexible in her thinking.
One interesting plotline could be Hermione's discovery of her heritage as a Founders' heir. Maybe she starts to show unique magical abilities related to the Founders. For example, she could have an uncanny ability to understand and manipulate ancient magic spells that were lost over time. This newfound power might put her in a position where she has to protect Hogwarts from an unknown threat, using the knowledge and powers passed down from the Founders.
One common theme is the exploration of magic in a more primitive or foundational way. Since it involves the founders, there's often a focus on how the basic principles of magic at Hogwarts were established. Another theme can be Hermione's role in bridging the gap between the modern wizarding world she knows and the ancient ways of the founders. For example, she might use her modern knowledge to solve problems that the founders faced in their time.
If Hermione were raised by the founders in fanfiction, she would likely be in a very small, exclusive magical environment. There would be no modern wizarding technology or the influence of the Ministry of Magic as we know it. She could be taught magic in a purer form. Her relationship with Hogwarts itself would be different too. Instead of being a student, she might see the school as more of a family home. And her views on blood purity and the different houses might be completely different, as she would have been influenced by the founders' original intentions for the houses.
In most 'Hermione founders heir fanfiction', Hermione is the main focus. However, other important characters include the other Hogwarts founders in a sort of spectral or legacy - based way. Harry and Ron are usually there as well, since they are an important part of Hermione's life. Sometimes, new characters are introduced who are related to the founders' history or the mystery of the heirship. And, of course, there are the professors at Hogwarts, like McGonagall, who can be involved in the story as they have knowledge of Hogwarts' traditions.
Some pure - blood supremacists could also be antagonists. They may see Harry and Hermione, especially if Hermione is an heir as a Muggle - born, as a threat to their idea of a pure - blood - only wizarding society. They would do whatever it takes to stop them from rising to power and using the founders' legacy to promote equality and change in the wizarding world.