One idea could be exploring how the eldritch elements interact with the magic in Hogwarts. For example, an eldritch force might seep into the Forbidden Forest and start to corrupt the magical creatures there, leading to strange and dangerous new behaviors among them. Another could be about a student who discovers an eldritch spellbook in the Room of Requirement and has to deal with the unforeseen consequences of using its spells.
A good fanfic concept might be to have an eldritch entity take over a Hogwarts professor. The professor's behavior starts to change in very strange and disturbing ways. They might start teaching unorthodox magic that has an eldritch feel to it. Students like Harry, Hermione, and Ron would then have to figure out what's wrong with the professor and how to stop the eldritch influence before it spreads throughout the school.
One interesting idea could be a fanfic that focuses on the Marauders' time at Hogwarts. It could explore their pranks, friendships, and how they came to be the legends that we hear about in the original books. For example, showing how they created the Marauder's Map in more detail.
One interesting idea could be a fanfic where the Marauders attend Hogwarts during modern times. They'd have to deal with things like smartphones and social media while still maintaining their mischievous ways. Another could be a story that focuses on the lives of the house - elves after the events of the books, perhaps exploring their newfound freedom. And a third idea could be a fanfic about a new dark wizard emerging in the wizarding world years after Voldemort's defeat, and how the new generation of Hogwarts students respond.
A great 'Harry Potter fanfic' idea might be a story that delves deeper into the relationship between Snape and Lily. Maybe a fanfic where Snape has a chance to change the past and save Lily in a different way. Another idea is to write a fanfic about the ghosts in Hogwarts and their backstories, like how they died and why they chose to stay at the school. Additionally, a story where the Weasley twins open a magical joke shop in a different country and the challenges they face there would be really interesting.
One interesting idea could be exploring the lives of the minor characters more in - depth. For example, what was Neville Longbottom's life like during the summers at home? Another idea is to create an alternate ending to the series. Maybe Voldemort could have been redeemed instead of defeated. Also, a fanfic could focus on the magical creatures and their own society within the wizarding world.
One popular 'Harry Potter eldritch abomination fanfic' could be 'The Abyss Beyond Hogwarts'. It takes the normal magical world of Harry Potter and twists it with elements of eldritch horror. The story often plays with the idea of ancient and unknowable magic that lurks in the shadows of the familiar Hogwarts.
The main difference is the element of eldritch abomination. Regular Harry Potter fanfic usually focuses on the existing magical world, relationships, and adventures within the framework set by J.K. Rowling. But 'Harry Potter eldritch abomination fanfic' brings in elements of the unknown, the unknowable, and often the terrifying. It might introduce strange and otherworldly magic that is not part of the normal wizarding world, like dark entities or powers that defy explanation.
One interesting idea could be a crossover with 'Lord of the Rings'. Imagine Harry and his friends in Middle - earth, facing the dark forces there. They could learn new magic from the wizards in Middle - earth or teach their own brand of magic. Another idea is a crossover with 'Percy Jackson'. The demigods and the wizards could team up to fight a common enemy that threatens both the magical and the mythological worlds. Maybe they'd have to combine their powers and strategies.
One idea could be creating a new magical game within the Hogwarts world. For example, a game that combines elements of Quidditch and wizard dueling. The characters could form teams and compete in a tournament where they have to both fly on brooms and use spells against each other. This would add a new and exciting dynamic to the fanfic.
A really interesting concept would be Stiles being a time - traveler in the Harry Potter world. He could go back in time to witness important events in the wizarding world's history and even change some small things that have a big impact on the present in the fanfic's storyline.
One idea could be a crossover where the characters from Harry Potter visit the world of SG1. Maybe Harry and his friends could learn about the Stargates and the different planets. Another idea is a story where the magic from Harry Potter is combined with the technology in SG1, like using spells to enhance the function of some SG1 devices.