In this fanfiction, Bella Swan's character could develop in terms of her social skills. Since the Gilberts are often in the center of the town's social scene, Bella would have to adapt. She might start making more friends, not just within the Gilbert family but also among their associates. This would make her more outgoing and less of an outcast. She could also learn how to handle different personalities, which would contribute to her growth as a character.
She might become more protective. As Silas's sister, she would have a natural inclination to safeguard him, which could make her more assertive.
As a Mikaelson twin, Bella would likely become more assertive. In the Twilight series, Bella was often more passive, but in the Mikaelson world, she'd need to be tough. She'd have to learn to use her newfound powers quickly. Also, her relationships would change. Instead of being focused on Edward or Jacob, she'd be dealing with the complex family dynamics of the Mikaelsons. Her sense of loyalty would expand to include her new family, and she might become more calculating in her actions to protect them.
In an army fanfiction, Bella Swan's character would transform in many ways. Her self - confidence would grow exponentially. She was always a bit self - conscious in the original story, but in the military environment, she'd have to believe in herself to succeed. She'd also become more independent. No longer relying on others to protect her as much, she'd be trained to protect herself and her comrades. And her adaptability would improve, being able to adjust to different military bases, climates, and combat situations.
In some fanfictions, Bella's character might become more confident. As an immortal, she no longer has the same fears of mortality. For example, she could be more fearless in facing dangerous situations.
She might become more assertive. As the daughter of Ares, she would inherit some of his war - like traits. So, instead of being the somewhat passive Bella in the original story, she could be more proactive in making decisions and taking action. For example, she may no longer wait for others to protect her but instead take the lead in dangerous situations.
Well, Bella's deep loyalty, especially to Edward, could be something that Elena might envy or admire. On the other hand, Elena's ability to handle multiple relationships in 'The Vampire Diaries' might seem strange to Bella. However, they would probably learn from each other. For instance, Bella could teach Elena about the more solitary and self - controlled nature of the Cullens, while Elena could show Bella how to be more open with her feelings towards others in a group setting.
One possible plot could be that Bella Swan, in this fanfiction, becomes a huge admirer of the Gilbert family. Maybe she is intrigued by their history in the town. She could start to study their family tree, trying to understand the secrets they hold. This could lead her to befriend members of the Gilbert family and get involved in their daily lives, which might be full of both normal family drama and some supernatural elements as in the original 'Twilight' and 'The Vampire Diaries' universes where the Gilberts are from.
Bella could interact with Sam and Dean in a very interesting way. Given her own experiences with the supernatural in the Twilight world, she would have some knowledge to bring to the table. She might be a bit of a nuisance to them at first, like constantly asking questions and fangirling a bit. But then, as she proves herself useful, like by using her knowledge of Twilight vampires to help them with a similar - type of supernatural being they encounter. Sam would likely be more patient with her, while Dean might be a bit gruff but would eventually warm up to her.
She would likely become more confident in her own strangeness. Instead of being the somewhat shy and self - deprecating Bella we know from the Twilight series, she would embrace her darker side. For example, she might not be as hesitant to stand up to those who try to bully or intimidate her.
In princess fanfiction, Bella's character often becomes more assertive. For instance, as a princess, she has responsibilities and power. So, she may no longer be the meek girl from the original story. She might take charge in situations, like leading her people or making important political decisions.