It could be other vampires who are jealous of their unique relationship. Maybe there are some traditionalist vampires who don't accept this new kind of mating bond among them.
In some cases, it might be werewolves who see the three of them as a threat to their territory or way of life. They could try to drive them out or cause trouble for them.
In some cases, a powerful and rogue vampire who has his own agenda could be the main antagonist. This vampire might be after Bella for some special ability she has or he could have a vendetta against Rosalie. He would constantly be causing trouble for them, trying to disrupt their lives and relationships within the Cullen family.
It could be that an old enemy of Stefan's family decides to target Bella as a way to get back at Stefan. This enemy might be another vampire clan or a supernatural being with a long - standing grudge. They would do everything in their power to disrupt the relationship between Bella and Stefan, causing all sorts of problems and conflicts for the two of them in the fanfiction.
It's Bella and Rosalie. Bella, the human - turned - vampire with a unique charm and a knack for getting into extraordinary circumstances. And Rosalie, the elegant and sometimes aloof vampire. As mates in this fanfiction, their relationship will drive the story. Their different backgrounds, Bella's human past and Rosalie's long vampire existence, will create interesting dynamics as they navigate their new relationship together.
The main characters are obviously Bella and Rosalie. Bella, a human - turned - vampire, is known for her strong will and her complex relationship with the Cullen family. Rosalie, on the other hand, is a beautiful and somewhat aloof vampire with her own set of insecurities and desires. In these fanfictions, their relationship as mates takes center stage, and other characters from the Twilight series like Edward, Alice, and Carlisle may also play important supporting roles as they are part of the Cullen family and are affected by Bella and Rosalie's new relationship.
One possible storyline could be their adventures together in the vampire world. They might face challenges from other vampire clans and have to use their combined powers to overcome them.
Well, in this fanfiction, Alice is the one who might be seen as the 'seer' of the group. She can pick up on things that others miss. Rosalie is the strong - willed and confident character. And Bella, she's like the heart of the group, bringing a sense of warmth and relatability. They all play important roles and their interactions drive the story forward.
In some fanfictions, it could be the Volturi. They might see Bella and Alec's relationship as a threat to their power or their rules about vampire relationships. They could try to break them apart or manipulate the situation to their advantage.
One possibility could be that they form a strong bond like a family. They support each other in the challenges they face in the vampire world. For example, they might work together to protect their territory from other vampires. They could also share their different experiences and knowledge, like Alice's visions helping them prepare for future events.
The main characters are Alice Rose and Bella. Alice Rose could be a character who is very intelligent and has a deep understanding of the world around her. She might be the one who often comes up with plans to deal with various situations. Bella is probably a central figure as well, she might be the one that draws others to her. She could be someone who is empathetic and is able to make connections with different characters easily. And of course, there may be side characters like Jacob or Edward who play important roles in the overall story.
In Rosalie and Bella mates fanfiction, Rosalie's character development could involve her letting go of her past traumas more easily with Bella's presence. She becomes more forgiving and less bitter. Bella's development could be quite complex. She might grow to have a more nuanced view of the vampire world. She could start to question some of the things she once took for granted. Their relationship forces them both to look at themselves and grow in ways they hadn't expected.