A possible plot could be a crossover with a post - apocalyptic world. The vampire, with his immortality, has survived whatever catastrophe has befallen the earth. He meets a group of survivors who initially fear him but then realize his skills and knowledge could help them. They form an uneasy alliance. Also, a crossover with a time - travel story could be interesting. The vampire gets caught in a time - travel experiment and ends up in different historical periods, interacting with different cultures and trying to find his way back to his own time.
For an 'Interview with a Vampire' crossover fanfiction, a cool plot could be a crossover with a superhero universe. The vampire's powers could be seen as either a threat or an asset to the superheroes. He might have to prove himself not to be a villain. Or, there could be a crossover with a high - school drama. Imagine a vampire enrolling in a high school, trying to fit in while hiding his true nature. He gets involved in the typical high - school dramas like love triangles and rivalries, but with the added complication of his vampiric instincts.
One idea could be a crossover with a supernatural detective series. The vampire from 'Interview with a Vampire' could team up with the detective to solve a series of murders that seem to be vampire - related but have a more complex, otherworldly origin. Another plot could involve a crossover with a fantasy world. The vampire enters a realm full of magic and strange creatures, and has to navigate this new world while dealing with his own vampiric nature. Maybe he meets a powerful wizard who wants to use his vampiric powers for some grand scheme.
One idea could be a modern-day vampire from the Interview with a Vampire universe trying to blend into a tech - savvy society. They might struggle with using smartphones and social media while also trying to hide their true nature. Another could be a story about a vampire who falls in love with a human who is a vampire hunter. It would be full of conflict as they fight their feelings and their natural instincts.
One interesting idea could be exploring the backstories of the minor characters more deeply. In the fanfiction, they might give a detailed account of how a particular vampire was turned and what their life was like before. Another idea could be alternative relationships between the characters. For example, a fanfic might explore a different kind of bond between Louis and Lestat that wasn't fully shown in the show.
One interesting plot idea could be Louis exploring modern-day society. In many fanfictions, he might be faced with new technologies and social norms that are completely foreign to him. For example, he could be trying to navigate the world of social media while still maintaining his vampire secrecy. Another idea is his interactions with new vampires. Maybe he meets a young vampire who challenges his old - fashioned views on vampirism.
One idea could be a love triangle between a vampire from 'The Vampire Diaries' and two characters from 'The Originals'. For example, a young vampire falls in love with Klaus but also has a deep connection with Elijah. This could create a lot of tension and drama as the two brothers have their own complex relationship. Another plot could involve a powerful vampire from 'The Vampire Diaries' coming to New Orleans and challenging the power structure that the Originals have built. This would lead to battles and political intrigue within the supernatural community.
One idea could be that Naruto is somehow transported to the Vampire Knight world. He might initially be seen as a threat due to his unknown powers. But then he could start to form alliances with some of the vampires or the Day Class students. For example, he could team up with Zero to fight against the more evil vampires who want to harm the humans at the school. His ninja skills would be a new and exciting addition to the Vampire Knight universe.
One idea could be a character from Vampire Academy ending up in the Twilight world and having to adapt to their different vampire rules. For example, Rose could find herself in Forks and be really confused by the Cullens' 'vegetarian' vampire lifestyle.
One idea could be that Ichigo from Bleach gets transported to the Vampire Knight world. He might initially be mistaken for a threat by the vampires. But as he learns about their society, he could use his Soul Reaper powers to help protect the humans from rogue vampires. He might also form an unexpected alliance with a vampire, like Zero, who shares his sense of justice.
One idea could be that the main characters from Rosario x Vampire end up in an alternate universe where they have to face new challenges based on the rules of the other fandom. For example, they might encounter different types of supernatural beings with unique powers.
Well, perhaps Hermione is sent to the 'Vampire Diaries' world to retrieve a powerful magical artifact that has somehow ended up there. Along the way, she meets Damon and Stefan. She forms an unlikely friendship with them as they help her search for the artifact. In return, she uses her magic to protect them from some of the more dangerous supernatural threats in their world.
One idea could be that some of the Glee characters visit Mystic Falls for a singing competition. While there, they get caught up in the vampire drama. Maybe a vampire takes a liking to Rachel's voice and wants to turn her into a vampire so she can sing forever. Another plot could involve the vampires using the Glee club as a cover to hunt during their events.