One possible plotline is that Bella uses her new - found power to seek revenge on those who once threatened her or her loved ones. Another could be that she tries to unite different vampire groups with her power and charisma. Maybe she discovers a hidden vampire ability that no one else has and uses it to change the vampire world for the better.
There could be a plotline where Bella, as a powerful vampire, tries to protect the human world from the more dangerous and bloodthirsty vampires. She might establish her own coven of like - minded vampires. Or perhaps she has to deal with the jealousy and envy of other vampires who are not as powerful as she is, which could lead to internal vampire politics and conflicts.
A plot might involve Bella's power being discovered by humans, and she has to figure out how to keep the vampire world a secret while also dealing with the new - found attention. She may have to use her power to erase memories or create distractions. This could lead to a lot of internal conflict for her as she tries to balance her human side with her vampire responsibilities.
One plotline could be Bella's origin story. How did she become a mutant? Was it a genetic accident or something more sinister?
One possible plotline could be that Marcus discovers Bella's blindness and is initially hesitant about their relationship but then grows to see it as something that makes her unique and special. He might then become very protective of her.
In some 'Bella Swan as a Vampire' fanfiction, a great plotline is her exploration of her new vampire senses. She could find that her sense of smell leads her to discover things about the past of the places she visits. And in terms of relationships, her bond with Edward could change in a really interesting way. Since they are both vampires now, they might have different power dynamics and new challenges in their relationship. For instance, they could compete in terms of their vampire skills, which could either strengthen or strain their relationship.
One possible plotline could be Bella adjusting to her new vampire abilities. For example, she might struggle with her increased strength at first and accidentally break things. Another could be her relationship with Edward changing as they are now both vampires. Maybe they have newfound understanding and experiences to share.
One possible plotline could be a fight over a love interest. Maybe they both like the same vampire or human and it leads to a physical or verbal fight between Bella and Tanya.
Well, perhaps she is a metahuman in a world where there are different factions of metahumans. Bella could get caught in the middle of a power struggle between these factions. Maybe she has to decide which side she wants to be on, all while trying to understand and control her newfound powers. She might also meet other metahumans who become her friends or mentors and help her on her journey of self - discovery as a metahuman.
One possible plotline could be that Bella and Marcus form an unexpected friendship. They might start sharing secrets and helping each other out in a world full of challenges. For example, Marcus could be in some kind of trouble and Bella uses her unique perspective or skills to get him out of it.
Perhaps in the fanfiction, Paul is in some kind of danger and Bella's choice to be with him is about protecting him. Or it could be that Paul shows Bella a different side of the werewolf world that she finds more appealing than the vampire world she was initially drawn to. It could also involve Bella having to deal with the fallout from choosing Paul, like how it affects her relationships with the Cullens and the other werewolves.
In a 'bella plays football fanfiction', Bella could be a star player who gets injured right before a big championship. She then has to struggle with her recovery, both physically and mentally. Meanwhile, there could be some love interests or rivalries within the team that add more depth to the story. She might also have to deal with the pressure from the fans and the media while she's trying to get back in shape for the game.