Yes, there are some out there. You can start by looking on fanfiction platforms like Archive of Our Own or FanFiction.net. However, keep in mind that the quality can vary greatly. Some might focus on exploring an alternate universe where this strange pairing occurs, delving into how their different backgrounds and magic would interact in a relationship.
One interesting plotline could be exploring Merope's life before she met Tom Riddle Sr. Maybe her relationship with her family, the Gaunts, and how their dark and proud ways influenced her. Another could be a story where Merope uses her magic in unique ways to survive in a difficult situation, given her family's fall from grace.
Marvolo Gaunt is also quite popular. As Merope's father, he represents the old, dark ways of the Gaunt family. Fanfiction might explore his relationship with Merope in more depth, like how he treated her, and whether he had any hopes or plans for her future that were different from what actually happened.
One great fanfic could be 'The Life of Merope Gaunt'. It delves deep into her tragic backstory, exploring her family's dark legacy and how it shaped her. It shows her relationship with Tom Riddle Sr. in a more detailed and empathetic way, giving readers a better understanding of her motives.
One of the most interesting aspects is her relationship with Tom Riddle Sr. In some fanfics, it's not just a one - sided love potion - induced affair. They show how she might have truly loved him and how he could have had some feelings for her too, in a different set of circumstances.
It might involve a lot of world - building around the relationship. Since Merope Gaunt is from an old and rather dark wizarding family, there could be elements of her family's influence on their relationship. And for Harry, his more modern - day values might clash with the traditional ways of the Gaunt family.
One plot idea could be exploring Merope's life before she met Tom Riddle Sr. Maybe delving into her relationship with her family, the Gaunts, and how their dark and proud heritage influenced her. It could show her as a lonely figure, trying to break free from the toxic family environment.
Her character can be developed further by emphasizing her magical abilities. Since she comes from the Gaunt family, she likely has a strong magical lineage. Fanfiction could explore her learning and mastering of spells that were perhaps lost in the family or unique to her bloodline.
Fanfiction about Merope Gaunt and Tom Riddle Sr can offer new perspectives on the Harry Potter universe. It could explore how the Gaunt family's pure - blood mania influenced Merope's actions towards Tom. Maybe in some fanfictions, Tom Riddle Sr could be shown as having more agency in the relationship than in the original story. Instead of just being a victim of Merope's love potion, he could be written as someone who was initially intrigued by Merope's mystery and power, only to later be horrified by what she had done.
I think Merope Gaunt is also very fascinating in fanfiction. Her tragic love story with Tom Riddle Sr. is often explored in more depth. Fanfic writers might expand on her use of love potion and the consequences it had on her life and the life of her son, Voldemort, which gives a new perspective on the origin of the Dark Lord.