Stiles is another key character. He's smart and curious, and he would probably be intrigued by Bella's arrival. They could team up to figure out some of the strange happenings in town. Also, Lydia, with her intelligence and unique abilities, could form an interesting relationship with Bella, maybe as a confidante or a rival in some situations.
Derek Hale is also a prominent figure in Beacon Hills. Given his brooding and mysterious nature, his interactions with Bella could be full of tension. He might initially be suspicious of her but later come to respect her as she proves herself in the face of the town's supernatural threats. And of course, there are the other members of Scott's pack who could all have different kinds of interactions with Bella, from friendly welcomes to cautious appraisals.
One possible plotline could be Bella adjusting to the supernatural elements in Beacon Hills. Maybe she discovers the existence of werewolves and other creatures and has to learn to co - exist. Another could be her forming new friendships or even romances with the local characters.
Well, aside from the obvious ones like Alucard, Integra, and Seras, Bella might also interact with Walter. Walter is an old and experienced member of the Hellsing staff. He could be a mentor figure to Bella, teaching her about the history and secrets of the Hellsing Organization. Another character could be the Major from the Millennium Organization. If there's a crossover or a story where the two organizations clash, Bella would surely cross paths with him. His crazy and unpredictable nature would make for some interesting interactions with Bella.
Caroline Forbes is another character. As a vampire herself in Mystic Falls, she could either befriend Bella or be jealous of her presence. Caroline is known for her strong personality and her relationships within the vampire community.
She could interact with Elena. Since Elena is a central character in Mystic Falls, their paths are likely to cross. They might start as friends or rivals, depending on the story.
Stiles. Stiles is Scott's best friend and he's very intelligent. He could be the one who initially is suspicious of Harry but then realizes his value. Harry and Stiles might bond over their shared problem - solving skills, though in different ways. Harry with his magic and Stiles with his deductive reasoning.
There could be a local artist. This person could introduce Bella to the art community in New Orleans and help her see the city from an artistic perspective.
Maybe a co - worker at her new job in New York. This person could be a mentor or a rival at work, adding some drama to the story.
Edward would definitely interact differently. If Bella goes back in time and changes her initial approach, Edward might be more or less intrigued by her. For example, if she's more confident, he might be even more drawn to her than in the original story.
Well, Hermione is a strong - willed character. In Beacon Hills, this would serve her well. She would not be afraid to stand up to the powerful supernatural forces there. She could become a sort of mentor figure to the younger characters. She might teach them the value of knowledge and how to use it in the face of danger. Also, her magic could be a great asset in battles against the various threats that the town faces on a regular basis.
It could be her best friend. Her best friend might be the one who accidentally discovers Bella's secret in the fanfiction. And then they have to deal with the situation together, whether it's keeping the secret or helping Bella face whatever the secret entails.