The plot would also be affected in terms of the threats they face. If Bella is a demon, new enemies might emerge who are interested in her demonic powers. Also, the way she interacts with the other vampires in Forks would be altered. She might not be as accepted by them as easily as when she was human, or she could be seen as a valuable ally in their supernatural world.
The story would change drastically. For starters, her relationship with Edward would be very different. Instead of being the vulnerable human he has to protect, she would be a powerful being in her own right. Their dynamic might shift from protector - protected to more of an equal partnership, or even a power struggle if their goals don't align.
She would likely become more confident. Knowing she is the daughter of Hades, a powerful god, would give her a sense of self - worth that she might not have had before. For example, instead of being the damsel in distress in her relationship with Edward, she could be an equal partner, using her powers to protect him and his family if needed.
The story would likely have more action. Bella would be involved in more combat and stealth situations.
Bella's personality might become more assertive. Being around a Mikealson, who are often very dominant, she would need to hold her own. Instead of being the damsel in distress all the time, she could grow into a more self - reliant character. For example, she might learn how to fight better or use her wits in different ways.
With Edward, their relationship would be different. They'd be more equal in terms of strength and power. No longer would Edward need to constantly protect Bella. Instead, they could fight side by side against their enemies. Their relationship might also have a new dynamic of competition, as they both explore their new vampiric abilities.
Yes, in some fanfictions, Bella Swan can be depicted as a demon. Fanfiction allows for creative reinterpretations of characters, and making Bella a demon adds an interesting and often dark twist to the Twilight story.
She would be more confident. Since she's the daughter of a powerful god, she would have a sense of self - worth that might not have been as strong in the original story. She'd also be more assertive, using her powers to protect herself and others.
She would be much more confident. In the original Twilight, Bella is often insecure, but as Zeus's daughter, she would know she has divine powers and a powerful lineage. So she'd be more self - assured.
She might become more assertive. In the Twilight series, Bella is often rather passive, but in the Mikaelson family, she would need to be more forceful to hold her own. She'd have to learn to be more cunning and strategic, like the Mikaelsons are.
If Bella becomes a banshee, her relationship with Edward would be very different. He would be more protective of her as she has a new and potentially dangerous power. He might also be a bit wary as banshees are known for their wailing which could attract unwanted attention. With Jacob, he might see her as even more of an enigma and be more drawn to her in a way, since she's now a more powerful supernatural being.
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.