Maybe Thor is sent to the wizarding world for some reason. Hermione could be assigned to help him understand the magical ways. Along the way, they form an unlikely friendship and together they face a dark wizard who is trying to use Asgardian artifacts for evil. This would combine the magic of the wizarding world with the power of Asgard.
One plot idea could be that Hermione, through some magical accident, ends up in the Asgardian realm. Thor then has to help her get back home while she uses her magic to solve various problems in Asgard, like dealing with a mysterious magical threat that the Asgardians' magic can't handle.
In a more romantic plot, Hermione could be researching ancient magic and discovers a connection to Thor's world. She travels there to learn more and Thor is immediately intrigued by her intelligence. They start to fall in love as they explore the similarities and differences between their two worlds, all while facing opposition from some of the more traditional Asgardians who don't trust a 'mere mortal' wizard.
Well, a plot might be that Hermione is deaged due to a magical accident in the library. As a deaged Hermione, she has a different view on things. She might start to question the rules of Hogwarts more, as she doesn't have the same level of respect for them as her older self. Her friends, Harry and Ron, would have to deal with this new, more rebellious Hermione while also trying to figure out how to reverse the deaging spell. This could cause a lot of chaos in Hogwarts.
One plot idea could be Hermione helping Hagrid with a new magical creature he discovers. Maybe it's a creature that has unique abilities and Hermione uses her extensive knowledge from books to figure out how to take care of it.
A plot could involve FemHarry having a special connection to an ancient magical artifact that Hermione helps her research. As they dig deeper, they find out it has the power to change the wizarding world. They then have to protect it from dark wizards who want to use it for evil. This would lead to a lot of action and suspense.
How about a story where Hermione discovers a hidden talent for transfiguration that even McGonagall is surprised by. They then work together to perfect this new form of transfiguration, but face opposition from some of the more traditional - minded professors. Or, in a post - war Hogwarts, they collaborate to reform the curriculum to include more practical and modern magic, all while dealing with the after - effects of the war on the students and the school.
A plot could revolve around Hermione being transported to the Twilight universe and Alice taking her under her wing. They could then learn from each other. Hermione could teach Alice about magic, and Alice could show Hermione how to navigate the complex social structure of the vampires. This could lead to them forging a strong friendship and facing challenges together, like dealing with some of the more hostile vampires who don't trust Hermione.
Well, perhaps there's a fanfiction where Sirius Black is wrongly accused again, but this time Hermione believes in his innocence from the start. She uses her intelligence and resources to prove his innocence while they are on the run from the Ministry. Along the way, they form a deep bond and discover new magical abilities within themselves that they use to clear Sirius' name and also make some changes to the wizarding world's justice system.
A different plot might be that Hermione is paired with a character who has a dark past. The Marriage Law becomes a way for this character to redeem themselves. Hermione helps the character come to terms with their past mistakes, and in the process, they fall in love. This could show how love can be found in the most unexpected situations under the duress of the Marriage Law.
A plot could be that Hermione's family discovers a long - lost relative who is a powerful wizard. This relative could bring new opportunities and challenges for Hermione and her family. For instance, they might offer to tutor Hermione in a rare branch of magic, which could help her in her future endeavors.
One idea could be that they are forced to work together on a magical research project. Hermione's vast knowledge and Lucius's experience in the wizarding world create an interesting dynamic. They start off hating each other but gradually come to respect one another's abilities.
A possible plot idea is that in an alternate universe, the wizarding world has different alliances. Hermione and Abraxas meet at a magical symposium where they are both presenting on different forms of magic. They initially clash but then realize they have more in common than they thought. Or perhaps there is a mystery that only their combined skills can solve. Maybe a dark magic artifact that is related to both Gryffindor and Slytherin, and they must put aside their differences to stop its power from being misused.