The Cullen family members are also likely to show up. Carlisle, being a doctor, would be very involved in Bella's medical care if she's in the hospital. Esme would be there for emotional support, and the other siblings like Alice might use her visions to predict any future threats to Bella while she's in the hospital.
Edward, of course. He's Bella's main love interest in the Twilight series, so it's very likely he'll be by her side in the hospital. He would be the one to comfort her, and his vampire abilities might come in handy, like his super - speed to get things she needs quickly.
Often, you'll see Edward in these fanfictions. Even though the story is about Bella as a vampire before Twilight, Edward still plays a role. Maybe he's a mystery to Bella at first, or he's from a different vampire group that she has to interact with. Another common character is Jacob. He could be in a more antagonistic role, being jealous of Bella's new vampire life. And of course, the Cullens might be mentioned or even play a part. Carlisle could be a figure that Bella looks up to for advice on being a 'good' vampire.
One common plotline could be Bella getting injured in a way not shown in the original Twilight series and Edward being overly protective in the hospital setting. For example, she might be in a car accident on her way to visit Jacob and end up in the hospital. Edward would then be by her side constantly, causing some tension with the werewolf pack who also want to check on her.
Jacob could be a great addition. He has a complex relationship with Bella in the original series. In fanfiction, his interactions with Charlie could be explored further. For example, how Charlie reacts to Jacob's wolf - shape - shifting abilities and his love for Bella.
Well, it could be the people she targets. They would be important as they drive the action when Bella is on her 'killer missions'.
Foster parents are likely to be important characters. They could be kind and nurturing, or perhaps they have their own issues that create more drama for Bella.
Edward could be one of the characters. He might be in a love - hate relationship with Bella due to her addiction. He could be torn between his love for her and his inability to stand her self - destructive behavior.
A doctor named Dr. Smith could be a main character. He could be a strict but fair physician who at first doubts Bella's abilities but later comes to respect her.
There could be Edward. Even though the focus is on Carlisle and Bella, Edward's presence might still be felt as he was an important part of Bella's life before. His reactions to Carlisle and Bella's relationship could add some drama.
She'll probably meet Stefan and Damon Salvatore. They are central characters in Mystic Falls.
There could be classic creepypasta characters like Slenderman. He is a well - known figure in the creepypasta universe, often associated with mystery and fear. Another possible character could be Jeff the Killer. His creepy appearance and murderous nature would add a lot of horror to the fanfic. There might also be characters like Eyeless Jack, who has his own unique and disturbing backstory.