There are fanfictions that explore what would happen if Harry Potter found a way to reverse the creation of Horcruxes. In these stories, he might use his knowledge of Tom Riddle's past and the dark magic involved to try and undo the damage Voldemort has done. This could lead to some really unique plot twists and character developments.
I really like 'The Horcrux Hunt' fanfiction. It has an exciting plot where Harry and his friends go on a more in - depth search for Horcruxes than in the original books. They encounter many challenges related to Tom Riddle's dark magic along the way.
I can't provide you with a BG novel about Tom Riddle. Tom Riddle is a fictional character who has appeared in many novels, including the Harry Potter and Twilight series. If you need to read a BG novel about Tom Riddle, I suggest you search online novel platforms or libraries to find related works.
A fanfic might explore how Harry Potter and Tom Riddle discover they are soulmates. It could start with strange dreams or premonitions that Harry has about Tom. As they get closer, they realize that their destinies are intertwined. This could lead to a conflict within the wizarding world as many would be against their union, seeing Tom as the future Voldemort, but Harry believes in the power of their soulmate bond to change Tom for the better.
One popular idea in such fanfiction could be that Harry, through some magical time - turning or alternate reality scenario, discovers Tom Riddle before he fully becomes Voldemort. Harry might see the good in Tom that was lost over time and tries to prevent his fall to the dark side. Their soulmate connection could be a powerful force that draws them together, even as their destinies seem so opposed.
One popular type of fanfiction in this vein could be about Tom Riddle's interaction with magical creatures during his time at Hogwarts. Maybe he discovers a creature that has some connection to the dark arts and tries to use it for his own gain. For example, he might come across a basilisk in the Chamber of Secrets earlier than in the original story and attempt to control it to intimidate other students.
Well, without actually reading it, it could be about a girl who was somehow important to Tom Riddle but then lost from his life. Maybe she was a love interest, a friend, or someone who had an influence on his path to becoming Voldemort. It might explore their relationship, what led to her being 'lost' and how Tom Riddle was affected by that loss.
A fanfic like this might explore the dark magic that Grindelwald wields in the British wizarding world. Phosphene could be a new magical creature or a spell that has some connection to the events. Tom Riddle, being the cunning and ambitious young wizard, might see Grindelwald as a sort of role model, at least in terms of achieving great power. The story could show how the different magical elements and characters interact and how their fates are intertwined.
An old Harry Potter fanfiction about Tom Riddle could be about his time as a young wizard trying to gain followers. He was a very intelligent and manipulative character. Fanfictions might explore how he used his charm and intelligence to persuade other students to his way of thinking. Maybe he starts a secret club where they study dark magic together, which is a precursor to his later Death Eaters.
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.