Even some of the teachers might oppose her at first. For instance, Professor Snape (if he were still alive in the fanfiction). He has his own ways of running things in the Potions classroom and may not be quick to adapt to Hermione's new regime. However, over time, he might come to see the benefits of her changes.
Some Slytherins might oppose her. They are often traditionalists and may not like her new - fangled ideas for the school. For example, Draco Malfoy could be one of the opponents as he has had a long - standing rivalry with Hermione.
There could be some pure - blood supremacist families who oppose her. They might think that a Muggle - born like Hermione doesn't have the right to control Hogwarts. They would try to undermine her authority through various means, like influencing the school board or spreading rumors about her.
Hermione is the central character as the heir. Harry and Ron will surely be there, supporting her or getting into some trouble with her. Professors like McGonagall could be involved as well. They might either guide Hermione in her new role or be a bit skeptical at first. There could also be some antagonists, like Malfoy, who might try to undermine Hermione's position as the heir.
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.
Ron would be there too. He could be in charge of things like the Gryffindor common room or helping Harry with student relations. And of course, Dumbledore might still have some influence in the background, even if Harry is in control. His wisdom could be a guiding force for Harry as he navigates running the school.
Well, Ron is a given. He's Hermione's significant other, so he'd be deeply involved in the whole process. Luna Lovegood might also make an appearance. She has an unique perspective and could bring some calmness and different kind of support. And don't forget about Hagrid. He has a big heart and might come to offer his congratulations and well - wishes in his own, endearing way.
Other pureblood characters like Draco Malfoy would surely interact with her. Given her new status, Draco might be conflicted. On one hand, she's a 'mudblood' in his old view, but now as a rich pureblood, he might have to reevaluate his attitude towards her. And there could be other pureblood families' members who would either befriend or oppose her based on their family politics.
Other characters like Ginny Weasley could be part of 'hermione fails' fanfiction. Ginny might be Hermione's confidante when she fails in a relationship, offering advice based on her own experiences. Neville Longbottom could also be involved. He could be in a situation where Hermione fails to recognize his potential or she fails to help him when he needs it most. And of course, the Weasley twins, Fred and George, could be involved. They might use Hermione's failure as inspiration for one of their pranks or they could be the ones to cheer her up in a humorous way after she fails something important.
Harry and Ron are likely to be main characters. They would probably be intrigued by Hermione's new Jedi abilities and might get involved in her adventures. Maybe they try to learn some Jedi skills from her too. Another character could be Dumbledore. He would be curious about this new form of power Hermione has and might offer his wisdom and guidance.
Professor McGonagall could also be a main character who interacts with Hermione. As a strict but fair teacher, she could guide Hermione in her studies and also in her personal growth. For example, she might give Hermione extra responsibilities or tasks that help her develop leadership skills.
Even some of the Gryffindor students might be depicted as taking advantage in certain fanfictions. For instance, if they are jealous of Hermione's success or popularity, they could try to use her for their own self - promotion within the house or at Hogwarts.
Draco Malfoy would be a likely character. Since they are in the same house now, they would have more opportunities to interact. Their relationship could start off as hostile as always, but then gradually change as Hermione shows different aspects of herself in Slytherin.