One possible plot could be Hermione discovering the truth about her godfather being Tom Riddle and struggling with her own identity. She might be torn between her loyalty to her friends and the new - found family connection.
Yes, there are some out there. Some fanfictions explore this unique relationship by delving into how Tom Riddle's dark past might interact with Hermione's intelligence and moral compass. It often creates a very interesting dynamic where Hermione has to grapple with the fact that her godfather has such a complex and often evil - leaning history.
One possible plot twist could be that Tom Riddle's dark tendencies start to resurface despite Hermione's positive influence. Maybe he begins to secretly manipulate those around him at Hogwarts while still maintaining a facade of being a reformed child. This could lead to a rift between Hermione and some of her friends who suspect Tom but don't understand why Hermione is so trusting.
In a different take, the marriage law might be a magical experiment gone wrong. Hermione and Tom are joined in this unorthodox union. Hermione could use her vast knowledge of magic to try and find a way out, but in the process, she starts to see Tom in a different light. Tom, on the other hand, might be intrigued by Hermione's intellect and her different approach to magic compared to what he's used to in the wizarding world of his time. This could develop into a relationship where they both learn from each other and ultimately change the course of their fates.
Perhaps in this fanfic, the apartment is a magical place that serves as a crossroads between different timelines. Tom Riddle stumbles into it while Hermione is already there studying some ancient magic. They are forced to co - exist in this small space. Tom is initially hostile, but Hermione uses her wits to keep him in check. As they interact more, they begin to understand each other's perspectives on magic, and a strange bond forms between them that could potentially change the course of the wizarding world.
Well, one possibility is that they try to change Tom's fate. Since they know the dark path he'll take in the future, they might use their knowledge of magic and friendship to guide him towards the light. Maybe they introduce him to a different kind of magic, one that focuses on helping others rather than power for its own sake.
Well, perhaps the plot could involve Hermione actually getting through to Tom Riddle in some way. Since she's so intelligent and empathetic, she might start to make him question his dark ways while being kidnapped. This could lead to a really interesting internal struggle within Tom. Also, there could be a twist where the kidnapping is part of a much larger plan that involves other dark wizards or witches, and Hermione has to figure out how to not only escape but also stop this bigger conspiracy. Or it could be that Hermione discovers a secret about Tom Riddle's past during her captivity that she can use to her advantage.
Tom could manipulate Hermione. He is a very intelligent and cunning boy. He might see Hermione as a means to an end. Maybe he could use her knowledge of magic to further his own studies in the dark arts. He could pretend to befriend her while secretly plotting to use her magic for his own evil purposes. However, Hermione is also smart and would likely catch on eventually.
The story could also involve Hermione using her magical knowledge to help Tom control his powers. Since Tom is a powerful wizard from a young age, he might have difficulty handling his magic properly. Hermione, being a brilliant witch, could guide him. This could lead to a unique bond between them, where Tom respects Hermione for her abilities and Hermione sees the potential for good in Tom.
The plot could center around a ballet competition. Tom Riddle, with his natural ambition, is determined to win at all costs. Hermione, on the other hand, is there to experience the beauty of ballet. Their paths cross, and they start to influence each other. Tom might learn about the value of fair play from Hermione, while Hermione might understand the depth of Riddle's past traumas that drive his cutthroat nature.
Well, if Hermione were Tom Riddle's sister in fanfiction, it would completely rewrite the whole Hogwarts saga. For one thing, Hermione's values of friendship and justice would be in direct conflict with Tom's path to becoming Voldemort. Maybe she could have tried to steer him away from the dark side early on. But it's also possible that her presence in his life could have been used by him to gain more power and knowledge, using her intelligence for his evil ends.