A cool concept would be to have Caroline from The Vampire Diaries go to New Orleans and get involved with the Mikaelson family. She could use her vampire strength and her knowledge from Mystic Falls to help them out in some way. Maybe she becomes friends with Hayley and they work together to keep the Mikaelson family safe from their enemies. Also, Damon could end up in New Orleans and cause some chaos among the Originals, as he is known for his unpredictable behavior.
Another storyline could involve Klaus from The Originals going to Mystic Falls. He might form an unexpected alliance with some of the characters there, like Damon. Their combined bad - boy attitudes could lead to some really wild adventures as they take on common enemies, perhaps some new, powerful vampire or witch that threatens both their worlds.
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.
A popular one is 'A New Alliance'. In this fanfiction, the plot brings together the different supernatural elements from 'The Vampire Diaries' and 'The Originals' in a unique way. The author does a great job of maintaining the personalities of the original characters while also creating new and exciting storylines. It's a must - read for fans of the two shows.
Some fanfictions might delve into the magic systems in these shows. In a 'Originals Vampire Diaries' fanfiction, the author could expand on the use of different spells and how they affect vampires. They could create new spells or explore the limits of existing ones, adding more depth to the magical aspect of the story.
Themes that resonate with the original shows are important. Since both 'The Vampire Diaries' and 'The Originals' deal with themes like family, loyalty, and power, a good crossover fanfiction should explore these themes further. It could show how the different characters from both shows view and handle these themes when they interact with each other.
One idea could be that a vampire from The Vampire Diaries somehow ends up in Smallville. Maybe they're drawn there by the strange meteor - related powers in Smallville. Another could be a character from Smallville, like Clark, having to deal with the vampire lore and politics of The Vampire Diaries' world. It could create really cool scenarios where Clark's powers are put to the test in a different way, like against a vampire's super speed or mind control abilities.
Perhaps a spell gone wrong in the Buffy universe causes some of the main characters from there to swap bodies with characters from The Vampire Diaries. This could lead to humorous and tense situations as they try to figure out how to reverse the spell while still dealing with the threats in each other's worlds.
One idea could be a story where the vampires from 'True Blood' and 'The Vampire Diaries' have to team up to fight a common enemy, like a powerful ancient vampire or a new type of supernatural threat. Another could be a love story between a character from 'True Blood' and one from 'The Vampire Diaries', exploring how their different vampire cultures affect their relationship.
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.