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.
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.
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.
One idea could be a story where Bill and Hermione team up on a dangerous mission to rescue a group of magical creatures being held captive by dark wizards. Bill's experience with handling dangerous situations and Hermione's vast knowledge of magic would make them a great duo.
One plot idea could be that Hagrid discovers a magical lemon grove that has special properties. Hermione gets involved in researching it. They might face challenges like protecting the grove from dark wizards who want to use the lemons for evil potions. It could also involve them using the lemons' magic to help Hogwarts in some way, like curing a strange illness that has befallen some students.
One plot idea could be that Hermione discovers a long - lost spellbook of Salazar Slytherin. As she delves into it, she starts to understand his view of magic in a new way. Maybe the spells in the book are different from what she has learned before, and she has to struggle with whether to use them or not, given Slytherin's somewhat dark reputation.
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.
One plot idea could be that Hermione loses her sight due to a dark magic spell during a battle. She then has to rely on her other senses and her friends' help more than ever. For example, Harry and Ron could describe the magical texts to her so she can still study and find a way to reverse the spell. Another idea is that she's born blind in this fanfiction universe, but she still manages to excel at Hogwarts by using her extraordinary memory and auditory learning skills.
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.