Well, perhaps the story could be about Kol's twin as Bella Swan trying to find a way back to her own world. Along the way, she has to navigate the complex relationships in Forks. She might befriend some of the characters like Alice in a different way, sharing with her some of the prophetic knowledge she has from her Mikaelson heritage. And when it comes to the werewolves, she could have a more diplomatic approach compared to Bella, due to her experience dealing with different supernatural factions in her own world.
One possible plot could be that Kol's twin sister, being a vampire in the Twilight universe as Bella Swan. She might be intrigued by Bella's relationship with the Cullens. Maybe she tries to interfere in their relationship out of jealousy or a desire to understand human - vampire love better. Since she has her own vampire powers from the Mikaelson lineage, it could create some interesting conflicts with the vampires in Forks.
If Kol's twin was in Bella's body, her personality would likely change the story a great deal. Kol's twin would probably be more assertive and less passive than Bella. She might not put up with Edward's over - protectiveness in the same way and would be more likely to go off on her own adventures. This could lead to her getting into more dangerous situations or uncovering secrets faster.
One idea could be a story where Bella discovers the world of the Mikaelsons after being turned into a vampire. She crosses paths with Elijah and they form an unlikely alliance to deal with a common threat in the supernatural world. They learn from each other's experiences, with Bella's knowledge of the Volturi and Elijah's centuries - old wisdom.
A really interesting storyline could be Bella trying to reconcile her old life in Forks with her new life as a Mikaelson. She might struggle with the differences in values and lifestyles. For example, the Mikaelsons are more into power plays and manipulation in the supernatural world, while Bella was used to the more straightforward (although still complex) relationships in 'Twilight'. This internal conflict could be a major part of the story, along with her trying to find her place within the Mikaelson family and the wider supernatural community.
There is some. However, the quality can vary greatly. Some might focus on a romantic relationship between them, while others could be more about a friendship or an adventure they go on together. It really depends on what you're interested in. You might have to sift through a few to find the ones that really appeal to you.
When it comes to the other Cullens, like Alice, Kol's sister could be both intrigued and a bit dismissive. Alice's visions might seem like a novelty to her at first, but then she could start to resent them if they interfere with her own plans. And with Jacob, she might be amused by his werewolf nature. She could see him as a more natural predator compared to the 'tame' vampires of the Cullens. Overall, her interactions would be a mix of curiosity, rivalry, and in some cases, friendship.
Klaus would probably be very intrigued by Bella. He's used to getting his way with most people, but Bella is not easily swayed. So he might start by trying to charm her, but she would be resistant. For example, he could offer her power or protection, but she would be more concerned about her own values and the people she cares about in Forks.
Well, if Bella Swan is a Mikaelson in fanfiction, it could lead to some really interesting character developments. Maybe she inherits the Mikaelson's power and has to learn how to control it. It also might change her relationships. For example, her relationships with the Cullens in 'Twilight' would be completely different as she now has a connection to the Mikaelsons. This could create a whole new set of conflicts and alliances.
Research is key. Look into the 'Twilight' series to fully understand Bella's world and the 'The Vampire Diaries' / 'The Originals' universe for Elijah. When writing their relationship, start slow. Maybe they start as reluctant allies. As for the story's setting, you could choose a new location that combines elements of both their worlds, like a small town that has a hidden vampire coven and is also on the verge of being invaded by an ancient evil that only they can stop together. You can also add some secondary characters from both franchises to add more depth to the story.