What are some interesting plot ideas for 'the originals supernatural crossover fanfiction'?

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.

Maybe the Avengers need the help of the witches from 'The Originals' to reverse a spell that an enemy has cast on Earth. Klaus and Loki could have some interesting interactions as two complex anti - heroes. The witches could use their magic to enhance the Avengers' weapons or powers in unique ways.

One idea could be that Buffy and her friends are called to New Orleans because of some strange vampire activity that seems linked to the Originals. Maybe the First Evil from Buffy's world has some connection to an ancient threat in the Originals' world, and they have to team up to stop it.

A really cool plot for this crossover fanfiction could be that there is a prophecy in both the Twilight and The Originals worlds. It predicts that a certain character from each universe must join forces to save both worlds from a great evil. This could be a dark force that is slowly consuming all supernatural beings. Bella Swan could be the key in the Twilight world, and Hope Mikaelson in The Originals world. As they meet and start to work together, they face many challenges due to the different beliefs and power systems in their respective worlds. Their friends and families from both sides also get involved, creating a complex web of relationships and power struggles.

Perhaps a powerful enemy from Merlin's past resurfaces and is causing chaos in both his world and the world of the Originals. Merlin and the Mikaelson family have to work together to defeat this enemy. The Mikaelsons' cunning and physical strength combined with Merlin's magic could make for an epic battle. Along the way, there could be interesting character interactions, like Elijah being impressed by Merlin's wisdom and honor.

One idea could be to cross the characters with another popular supernatural show's characters. For example, bringing in some characters from 'Buffy the Vampire Slayer' and seeing how they interact with the originals. Maybe Buffy could team up with Klaus to fight a new, powerful enemy that threatens both their worlds.

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.

Well, a cool plot could be that an ancient, powerful entity from the Supernatural world is awakened in Smallville. Clark discovers it while trying to protect the town. He realizes he can't handle it alone and contacts Bobby Singer through some means. Bobby then sends Sam and Dean to help. They initially have a hard time trusting Clark because of his superpowers, but soon realize they need his help. As they battle the entity, they discover it has ties to an old, forgotten lore that involves both the kryptonite on Earth and a powerful demon they once fought. They have to combine their knowledge and powers to defeat it.

Perhaps there could be a crossover where the Endbringers in 'worm' are actually manifestations of some ancient supernatural evil. And a group of supernatural hunters from another dimension come to Brockton Bay to fight them, teaming up with local parahumans.

One idea could be that the Winchesters end up in Star City and team up with the Arrow to fight a demon that is using technology to cause chaos. Maybe the demon has possessed some of the tech - savvy villains in the Arrowverse.