A great fanfiction idea could be a crossover where a character like Hermione uses her knowledge of magic to try and find a cure for vampirism in the world of 'The Vampire Diaries'. She could team up with Bonnie Bennett, and together they could explore new magical theories and spells to solve this problem.
One interesting fanfiction could be about a wizard from 'Harry Potter' ending up in the world of 'The Vampire Diaries' and having to navigate the different magical rules and vampire politics. Maybe they form an alliance with the Salvatore brothers to fight against a common dark magic threat.
There might be a fanfiction where the vampires from 'The Vampire Diaries' are brought to Hogwarts. This could lead to some really cool interactions. For example, the vampires might be intrigued by the different types of magic at Hogwarts, and the Hogwarts students would be both fascinated and a bit scared of the vampires. It could be a story full of adventure as they try to co - exist.
One great 'Harry Potter' and 'Vampire Diaries' harem fanfiction could be 'The Magical Crossover'. It combines the magical elements from both worlds really well. The characters from 'Harry Potter' like Harry and Hermione interact with the vampires from 'Vampire Diaries' in a really interesting way. There's also 'A World of Magic and Vampires' which has a unique plot where the Hogwarts students end up in the 'Vampire Diaries' town and form relationships in a harem - like setup.
There's a fanfiction titled 'Vampire Potter'. In this story, Harry is turned into a vampire early on. It explores how his new nature affects his relationships with his friends like Ron and Hermione. His vampire abilities also give him an edge in dealing with the dark forces in the wizarding world. For example, his enhanced speed and strength help him in battles against Death Eaters.
One interesting fanfiction could be a crossover where characters from both universes meet. For example, imagine Hermione meeting Damon Salvatore. Another could be a story that delves deeper into the backstories of minor characters in both series. There are also fanfictions that rewrite certain plot points in a more creative way, like if Voldemort was somehow related to the original vampire bloodline in Vampire Diaries.
There are also fanfictions that introduce new LGBT characters into the Vampire Diaries world. They might be a group of vampire hunters who are all lesbians, and their interactions with the main characters, both positive and negative, create exciting new storylines that deviate from the original plot but still stay true to the overall feel of the show.
One interesting Vampire Diaries compulsion fanfiction could be one where a vampire uses compulsion in a creative way to protect the main characters from a new threat. For example, compelling a group of werewolves to forget they saw the vampires in a certain area.
There might be a fanfiction that focuses on the backstories of the minor characters in the Vampire Diaries. For example, a detailed story about Bonnie's family history and how it ties into her magic. This can add depth to the overall Vampire Diaries universe within the fanfiction.
One interesting 'The Vampire Diaries Tatia' fanfiction could be the ones that explore her relationship with the original vampire brothers before the events of the show. For example, a fanfiction might delve into how Tatia's love was a catalyst for the brothers' rivalry in a more detailed and alternative way compared to the show.
Perhaps a fanfiction where Saraaa is a key figure in an alternate universe. In this universe, the rules of the vampire diaries world are slightly different. For example, instead of the sun and moon curse, there could be a curse related to Saraaa's existence. And all the characters' fates are intertwined with hers in unexpected ways. It could be a really cool exploration of a different take on the Vampire Diaries world.
There's a fanfiction where an OMC vampire arrives at Hogwarts and becomes friends with Harry Potter. In this story, the vampire has a different view on magic compared to the wizards. He uses his vampire abilities, like super speed and enhanced senses, to solve mysteries around the school that the regular students can't. It adds a new and exciting dynamic to the familiar Harry Potter setting.
One interesting Elena compelled fanfiction could be where she is compelled to forget her love for Stefan and starts to develop feelings for Damon in a very different way. It changes the whole dynamic of the triangle in a unique way.