Well, perhaps in the fanfiction, Hermione time - travels to Tom Riddle's era and she attempts to understand his early life better. She could try to find the root of his evil and change it. For example, she might discover that a particular event in his childhood was the turning point. As for Tom Riddle traveling to Hermione's time, he could be fascinated by the advanced magic and the different social structure in the wizarding world, which might make him question his own beliefs.
In a time travel fanfiction with Hermione and Tom Riddle, a possible plot is that Hermione accidentally travels back to Tom's time. She decides to use her intelligence to befriend him and introduce him to different concepts of magic that are more positive. This might make Tom Riddle see magic in a new light. On the other hand, if Tom travels to Hermione's time, he could be both intrigued and threatened by the power that witches and wizards have in the future. He may try to adapt these new powers to his own dark purposes, but Hermione is there to stop him.
Perhaps Ginny and Tom both travel to a different time period, like the Middle Ages. There, they have to work together to survive in a world full of magic they don't fully understand yet. Ginny could use her modern knowledge of magic, while Tom's natural cunning helps them navigate the social and political aspects of that time. This could lead to a strange alliance and a re - evaluation of their relationship.
One plot idea could be that Hermione travels back in time and tries to prevent Tom Riddle Jr from becoming Voldemort. She might use her knowledge and magic skills to change his path. Another could be a scenario where they meet in an alternate universe where the rules of good and evil are more blurred, and they form an unlikely alliance to face a greater threat. Maybe Hermione gets trapped in a magically created world by Tom Riddle Jr, and she has to outwit him to escape and in the process, she discovers some hidden secrets about his past that could have changed his future.
Well, perhaps in the fanfiction, Hermione as a Veela has the ability to enter Tom Riddle's dreams. In his dreams, she shows him the consequences of his future actions as Voldemort. This makes Tom start to have doubts about his planned path of evil, and he has an internal struggle between his dark desires and the newfound influence of Hermione's Veela presence.
A possible plot is that a young wizard, who is a huge fan of Harry Potter stories in his own time, somehow gets transported back to Tom Riddle's era. He initially just wants to see the famous Hogwarts of that time. But then he crosses paths with Tom Riddle. He decides to use his knowledge of the future to try and befriend Riddle and change his path. However, he soon realizes that Riddle is far more complex and dangerous than he expected, and his actions start to have unforeseen consequences on the future.
One idea could be that Harry accidentally travels back in time and meets a young Tom Riddle before he fully turns evil. He tries to change Tom's path by befriending him and showing him kindness, which leads to a series of events where the future of the wizarding world starts to change in unexpected ways.
One plot idea could be that it's a time - travel based fanfic. Hermione somehow gets sent back in time and meets Tom Riddle before he fully turns into Voldemort. Their relationship starts out as a strange sort of intellectual connection. Maybe she tries to prevent him from going down the dark path and in the process, they develop feelings for each other which leads to her getting pregnant. This could then create a whole new timeline where the wizarding world is different due to Tom's change of heart.
One interesting plot could be a time - traveling character going back to Tom Riddle's school days at Hogwarts. They could try to prevent him from becoming Voldemort by befriending him and showing him a different path. For example, introducing him to the power of love and friendship which he lacked in his original life.
Another possibility is a scenario where Hermione is on a mission to study the early life of Voldemort for some academic or magical research. While at the orphanage, she discovers some hidden secrets about Tom Riddle's family that were previously unknown. This could lead to a series of events where she has to protect this knowledge from falling into the wrong hands, all while interacting with a young and curious Tom Riddle.
A more complex plot might be where both Harry and Tom are sent back in time to a point where the Hogwarts founders are still alive. They get involved in the founding events of Hogwarts, and Harry has to stop Tom from influencing the founders in a way that would make Hogwarts more exclusive and dark - sided. Harry could try to work with the founders to see the potential danger in Tom even at a young age.
Another plotline could be that both Harry and Tom are sent back in time together. They are forced to work together to get back to their own time. Along the way, they learn more about each other's motives and pasts, which changes their relationship in unexpected ways.