Yes, in many fanfictions, Bella is depicted as Damon Salvatore's mate. Fanfiction writers often create unique storylines where they pair characters in unexpected ways. This pairing can lead to interesting dynamics and plot developments.
Often, other vampires or supernatural creatures could be the main antagonists. For example, vampires who are jealous of Damon's newfound mate might try to drive a wedge between them. Maybe there are some werewolves who see Bella as a threat to their territory because of her relationship with Damon.
One common theme is the struggle for acceptance. Since Bella is the mate of both Damon and Stefan, there's often a plotline about how the vampire community or their friends accept this unusual relationship. For example, they might face judgment from other vampires who don't understand this triad.
One interesting plot could be the initial encounter between Bella and Damon. Maybe it's a chance meeting in a dark alley where Damon is immediately drawn to Bella's unique aura. Another could be their struggle to be together against the odds, like facing opposition from other supernatural beings in their world.
One possible plotline could be the struggle against other vampires who oppose their relationship. Another might be Bella adjusting to the vampire world in a different way than in the original stories, with Damon as her guide. Maybe they go on adventures together to protect their relationship from various threats.
One great fanfiction could be 'Bella's Bond with the Brothers'. It explores Bella's relationship with Damon and Stefan in a really interesting way, showing how she fits into their world of vampires and the unique dynamics that develop among them.
Caroline could be in the story. She might be Bella's friend or a rival. If she's a friend, she could help Bella navigate the supernatural world. If a rival, it could be because of her relationship with Damon or Stefan in some way. Also, Klaus could be a character. He might see Bella as a means to get to Damon, or he could be interested in her unique abilities if she has any.
There could be Bella's mother. She would be an important character as she was part of the relationship that led to Bella's birth. Maybe she has some secrets or reasons for keeping Damon away from Bella all these years.
Damon could be a vampire or some other powerful supernatural being. Bella might be a human, perhaps with some special quality that makes her a target for James. Maybe she has a unique scent or power that she's not even aware of yet.
It could be a new character entirely. Maybe a hybrid of some sort, half - vampire and half - werewolf, which would be a very unique and interesting choice for her true mate. This would bring a whole new set of dynamics to the story as Bella has only been involved with either vampires or werewolves before.