Well, in the original Twilight, Bella is quite naive and somewhat passive in many situations. However, when she is an assassin in fanfiction, her character development takes a different turn. She becomes more calculating and strategic. For example, she might use her knowledge of the Twilight world's secrets and the abilities of vampires and werewolves to her advantage in ways she never would have in the original. She also becomes more confident in her decisions, not relying on Edward or Jacob as much. Instead, she uses her assassin training to make her own choices and face the challenges in the story. This makes her a much more complex and interesting character compared to the somewhat one - dimensional Bella in the original story.
The original Bella is often seen as a love - struck girl focused mainly on her relationships. In the assassin fanfiction, Bella's focus shifts. She starts to value her skills and her mission more. Her relationships still exist, but they take a backseat to her assassin - related goals. She becomes more hardened, as she has to face the harsh realities of her new role. She might have to kill or deceive, which changes her moral compass compared to the original Bella. Her physical and mental strength also grow as she trains and executes her assassin tasks, making her a very different Bella from the one in the original Twilight story.
In the original, Bella is more of a damsel in distress. But as an assassin in fanfiction, she becomes more independent and self - reliant. She no longer waits for others to save her but takes matters into her own hands.
She might be more assertive. Since she is related to Klaus, she may inherit some of his confidence. So instead of being the meek Bella we know from the original, she could be more outspoken and take charge of situations.
Since Bella is already a vampire, her character development could focus more on her coming to terms with her new existence in a different way. She might not have the same initial struggles with bloodlust as she does in the books. Instead, she could be more interested in exploring the vampire culture and history right away. This would lead her to interact with different vampires, not just the Cullens, and gain a broader understanding of their world. This, in turn, would shape her character into a more worldly and independent vampire.
Bella's character often becomes more confident. As a vampire, she has newfound strength and abilities that make her less timid. For example, she may be more assertive in her relationships and in dealing with threats.
Bella may become a more adventurous character. Maybe she decides to try new things that she was always too afraid to do before because Edward was so overprotective. She could start going to parties, trying extreme sports, or exploring new hobbies. This new adventurous side of her would make her a more well - rounded character, and when Edward returns, he would see a completely different Bella.
Bella might become more confident as she takes this step into a new life with Jacob. She could also become more assertive in dealing with the werewolf pack politics that come with being Jacob's wife.
In some Bella Assassin Twilight fanfiction, Bella could be trained by an ancient vampire who saw her potential. This training makes her a force to be reckoned with in the Twilight universe, and she may even change the power dynamics between the vampires and werewolves with her new skills.
Obviously, Bella is a main character. She is often re - imagined as a more powerful and self - reliant version of herself as an assassin. Edward also plays a crucial role, usually being the love interest but also having to deal with Bella's new and dangerous side.
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 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.
Bella could become more independent. With Paul leaving, she has no choice but to rely on herself. She might become more assertive in making decisions for herself and her unborn child.