One possible plot could be the exploration of how Hermione's strong will and intelligence clash with Tom Riddle's dark and manipulative nature within the context of a forced marriage law. Maybe she tries to reform him in some ways.
Well, there could be a plot where Hermione, through a spell gone wrong, enters a dimension where Tom Riddle won the wizarding war and rules with an iron fist. She has to pretend to be on his side to survive and in the process, she discovers some redeeming qualities in him that she didn't expect. Another idea is that Hermione is researching a new form of magic that was only experimented with by Tom Riddle. As she tries to replicate his experiments, she accidentally summons a part of his spirit and they engage in a battle of wits and magic. And yet another plot could be that Hermione is sent on a mission to stop a new dark wizard who is using Tom Riddle's old methods, and in order to understand the enemy better, she uses a time - turner to go back and study Tom Riddle directly, which leads to unexpected interactions and consequences.
One possible plot could be Hermione using her modern knowledge and magic skills to raise Tom in a more positive environment. Maybe she teaches him about equality and kindness from a young age, which changes his view of the wizarding world and prevents him from turning into the dark lord. For example, she could introduce him to muggle culture and values, making him more accepting of different kinds of people.
Well, one intriguing plot is when Hermione goes back in time to stop Tom Riddle from making Horcruxes. It adds a whole new layer of drama as she has to figure out how to do it without disrupting the timeline too much. Another plot is when she travels back and tries to befriend Tom as a child, thinking she can change his future that way. In some fanfictions, the plot of Hermione getting trapped in the past while dealing with Tom Riddle's rise to power is also very interesting.
One possible plot could be how Hermione and Remus initially react to the marriage law. Maybe Hermione is initially resistant as she has her own academic and career goals. But as she gets to know Remus better, she starts to see the potential in their relationship. For example, they could bond over their love for knowledge, with Remus sharing his experiences at Hogwarts from an older perspective and Hermione impressing him with her new - age magical theories.
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.
One possible plot could be that Harry travels back in time to Tom Riddle's school days at Hogwarts. He could try to prevent Riddle from turning into Voldemort by befriending him and showing him a different path. Maybe Harry uses his knowledge of the future to expose the dark magic that was influencing Riddle at the time.
It's also about the time - travel or alternate universe concepts often used. For example, if Hermione goes back in time, she has the knowledge of the future. How will she use it to deal with Tom? Will she be able to change the course of history? All these possibilities make the fanfiction really engaging. And the power dynamic between them, with Hermione's magic being more learned but Tom's having a natural, dark power, adds another layer of complexity.
Hermione's studious and rule - following nature would surely clash with Tom Riddle's more devious and power - hungry personality. She values knowledge for the betterment of the wizarding world, while he desires power for his own gain. However, they could also blend in some ways. Hermione's intelligence might pique Tom's interest, and her strong moral compass could be a challenge he wants to break. Meanwhile, Hermione might see the potential in Tom before he became the evil Lord Voldemort and try to steer him towards the good side.
Hermione would likely become more hardened and cynical. Having to be married to someone as dark as Tom Riddle would test her ideals. Tom Riddle, on the other hand, might start to have some small moments of hesitation or confusion as Hermione's positive traits start to seep into his consciousness.
Another plot is where Hermione is accidentally transported to Tom Riddle's time and has to navigate the Hogwarts of that era while dealing with the enigma that is young Tom. Their interactions can range from friendly debates about magic to more intense confrontations as Tom starts to show his darker tendencies.