One common theme is the clash of ideologies. Hermione is all about justice, knowledge, and using magic for good, while Tom Riddle has his dark and power - hungry motives. Their interactions often highlight this contrast. For example, in many fanfictions, Hermione tries to persuade Tom to abandon his dark ways, leading to intense debates.
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 interesting fanfiction could be 'The Unlikely Alliance'. In this, Tom Riddle, before fully becoming Voldemort, and Hermione find themselves in a situation where they have to work together to solve a mystery that threatens the wizarding world. Their different perspectives, Hermione's knowledge and Tom's raw power, create a fascinating dynamic.
One common theme is the exploration of his dark past. Writers often dig deep into his childhood, his time at Hogwarts, and how he became the Dark Lord. Another theme is power. How he sought it, how it corrupted him, and what could have been different if he didn't crave it so much.
Tom Riddle became Voldemort through a series of dark choices. He was born to a witch mother who died during childbirth. Growing up in an orphanage, he already showed signs of his dark nature. He discovered his magical abilities and became obsessed with power. His hatred towards muggles and his desire for immortality led him to split his soul multiple times, ultimately transforming into Voldemort.
Well, in some fanfics, their relationship can be portrayed as a mentor - mentee relationship in reverse. Instead of Dumbledore mentoring Harry, Harry could try to mentor the young Tom Riddle. Harry would use his own experiences of overcoming darkness to guide Riddle away from the path of evil.
One great Harry Marvolo Riddle fanfiction is 'The Dark Lord's Heir'. It delves into an alternate universe where Riddle has an unexpected heir. The story is full of mystery and magic, and the author does an excellent job of portraying the complex nature of the Riddle legacy.
Maybe it's a group of future Ministry of Magic officials who have become corrupted by power. They view Tom Riddle as an anomaly from the past and fear that his knowledge of old magic could disrupt their control over the wizarding world, so they become the main antagonists in his journey.
Tom Riddle's love story could be a very dark one. In the wizarding world, he was so consumed by his quest for power and immortality that true love seemed a foreign concept to him. But if we were to imagine a love story, perhaps there was a girl in Hogwarts who saw a glimmer of good in him. She might have tried to reach out to the young Tom, but he ultimately rejected her love as it didn't fit into his grand plans of domination.
You could also create a fanfiction where a new character, an orphan just like Tom, arrives at the orphanage. This new character could either be a positive influence on Tom, trying to show him kindness and friendship, or they could be in competition with him for the limited resources or attention in the orphanage. This would add a new dynamic to the story of Tom Riddle in the orphanage.