In some fanfics, there's a plot where Tom Riddle and Harry Potter are part of a magical experiment that binds their fates together. This causes them to share emotions and thoughts, which leads to some really interesting character development for both of them. Another unique idea is that Harry discovers a long - lost spell that can transfer the essence of one wizard to another, and in an attempt to save the wizarding world from a new threat, he transfers some of Tom Riddle's essence into himself to better understand his enemy. There are also fanfics where Tom Riddle is resurrected in a new form that is neither fully good nor bad, and Harry has to decide whether to trust this new Tom or not.
One idea could be a time - travel fanfic where Harry goes back in time and tries to prevent Tom Riddle from becoming Voldemort. He could try to befriend the young Tom and show him a different path. Another could be a fanfic where Harry and Tom are somehow trapped in an alternate dimension together and have to work together to escape, all while Harry tries to understand what made Tom turn so evil. A third idea is a fanfic where Tom Riddle actually has a change of heart early on due to some magical accident that makes him experience a different kind of love and kindness, and Harry has to deal with this new Tom in Hogwarts.
One plot idea could be a time - travel scenario where Harry goes back in time and meets a young Tom Riddle. He tries to change Tom's path to prevent him from becoming Voldemort. Another could be a situation where they are magically bound together and have to learn to co - exist and understand each other's motives.
One plot idea could be a time - travel fanfic where Harry Potter goes back in time and tries to prevent Tom Riddle from becoming Voldemort. He could attempt to befriend the young Riddle and guide him towards a different path, perhaps by showing him the value of love and friendship early on.
One idea could be that Harry discovers a time - traveling device and goes back to Tom Riddle's childhood. He decides to take Tom under his wing and raise him with love and kindness. As a result, Tom doesn't become Voldemort and instead uses his magical abilities for good.
In a 'Harry Potter meets Tom Riddle' fanfiction, a really unique plot could be that Tom Riddle is reborn as a normal wizard without the dark desires due to some powerful magic. Harry Potter meets this new Tom and they become friends at Hogwarts. However, there are still some remnants of the old Tom's power that attract dark forces. So, Harry and Tom have to work together to fend off these threats while also exploring Tom's new identity and how it affects the future of the wizarding world. This would involve a lot of character development for both Harry and Tom, as they navigate their relationship in this new scenario.
One idea could be a time - travel plot where Harry goes back in time and tries to prevent Tom Riddle from becoming Voldemort. He could try to befriend the young Tom and show him a different path. Another could be a scenario where they are both put in a magically created alternate reality where they have to work together to escape.
A third popular theme is the power struggle between Harry and Tom. Given that they are two powerful wizards on opposite sides of the moral spectrum, fanfics often explore how their powers interact. This could be in the form of magical duels, or in a more psychological power play where they try to outwit each other. It adds an exciting element to the fanfic, as readers are always interested in seeing how these two powerful characters face off against each other.
One plot idea could be a time - travel scenario where Harry goes back in time and tries to befriend a young Tom Riddle before he turns evil. He could try to influence Riddle's life in a positive way, perhaps by introducing him to different values or people. Another idea is that Harry discovers a hidden part of Tom Riddle's past that holds the key to defeating Voldemort in a more psychological way, rather than just through magic battles.
Another plot could involve the diary having some sort of connection to the other Horcruxes. The protagonist, using their knowledge from the Harry Potter series, tries to use the diary to find the other Horcruxes. This would be a really exciting adventure as they navigate through the dark magic associated with both the diary and the Horcruxes.
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.