Well, it could be that Hermione inherits Hogwarts due to some magical law or prophecy. She then uses her intelligence and knowledge to make all kinds of reforms, like improving the curriculum for all students.
One possible plot could be that Hermione discovers an ancient magic that links her to Hogwarts in a way that makes her the rightful owner. As the owner, she decides to open Hogwarts to more international students, bringing in new cultures and magics. She also renovates the old parts of the castle that have been neglected for years. And she has to face the challenges of dealing with the Hogwarts ghosts who are used to the old ways and may not be happy with all her changes. She may also have to make tough decisions about which teachers to keep and which to replace in order to improve the overall quality of education at Hogwarts.
Perhaps in the fanfiction, after a great battle, Hermione is given the ownership of Hogwarts as a reward for her heroism. She might start new magical research programs at the school, and also make sure that Muggle - born students are treated even better. She could also have to deal with some dark forces that are still lurking around the school and trying to take it over. For example, she may have to find a way to protect the secret passages that lead in and out of Hogwarts from being used by the wrong people.
Maybe she'd take control to better protect the students. She might enforce stricter security measures around the castle and grounds. Hermione is known for her caution and strategic thinking, so she could organize the defense of Hogwarts in a more efficient way against potential threats, like Death Eaters or other dark forces.
Well, perhaps the plot could involve Hermione discovering some ancient secrets of Hogwarts that are only known to the heir. Maybe she has to face challenges that test her intelligence and magic skills in a whole new way.
One common theme is leadership. Hermione and Harry would likely take on leadership roles in Hogwarts, so stories might focus on how they make decisions for the school. Another theme could be protection. They would need to protect Hogwarts from new threats. And there's also the theme of innovation, as they might introduce new magical teachings or ways of running the school.
Perhaps the story could revolve around them facing challenges within the Hogwarts faculty. There could be some old - fashioned professors who oppose their modern teaching methods. Harry and Hermione then have to prove that their ways are beneficial for the students. They might also discover new magical abilities in some of the students that were previously overlooked, and help those students develop their skills.
Yes, there are likely many 'hermione owns hogwarts' fanfictions out there. You can try searching on popular fanfiction websites like Archive of Our Own (AO3) or Fanfiction.net.
One possible plot could be that in a darker, alternate version of Hogwarts, there is a mysterious 'collar stripper' who targets Hermione. Maybe it's a new form of dark magic or a person under the influence of some evil force. Hermione, being the intelligent and brave witch she is, tries to figure out the mystery behind this 'collar stripper' and how it relates to the safety of Hogwarts and her friends.
She could end up in a non - magical educational institution for a while. During this time, she might try to apply her love for learning in a different context, like studying advanced sciences. However, her magical abilities would still be there, and she could end up using them in unique ways, perhaps accidentally, which could draw the attention of the wizarding world and lead to her being brought into the magical community in a very different way than going to Hogwarts.
One possible plot twist could be that the baby has some unexpected magical abilities right from birth. Maybe it can communicate with magical creatures in a way no one has seen before. This would add an interesting element to the story as everyone at Hogwarts tries to figure out what it means.
One possible plot could be that they meet in a muggle library. Hermione is there researching magic in the guise of general knowledge books, and Harry stumbles upon her while looking for a quiet place to escape from the Dursleys. They start chatting about books, and Hermione is intrigued by Harry's strange yet endearing manner. They then realize they both have a connection to the magical world.
Perhaps she discovers a different magical school or a secret magical community outside of the Hogwarts system. In this fanfiction, she could be mentored by an eccentric and powerful wizard who has his own way of teaching magic, far removed from the traditional Hogwarts curriculum.