One possible fanfiction could be about Bella adjusting to her new vampire life while Alice, as a human, has to deal with the knowledge of the supernatural world in a different way. Maybe Bella tries to protect Alice from other vampires who might see her as a target because of her connection to Bella.
A plot could be that Bella, as a vampire, has to pretend to be human around Alice's family. This would involve a lot of hiding her powers and dealing with the difficulties of being around humans all the time. Another idea is that Alice, as a human, discovers a way to make Bella more 'human - like' again, and they embark on a journey to find the ingredients or perform the rituals necessary.
Well, one consequence could be that she has to distance herself from her human friends. Since she's now a vampire, she might be afraid of accidentally harming them. For example, her scent might be too alluring to them, and she could lose control. Also, her family relationships would change. Her father, for instance, would be left in the dark about her true nature, and she'd have to keep lying to him, which would create a strain on their relationship.
Well, Bella is usually the center of attention. She's the one who bridges the gap between the wolf pack and the vampires. The wolves are presented as having a strong sense of community and loyalty. They might be in conflict with the vampires at times because of their different natures. Alice, on the other hand, is like a guiding force. She uses her gift to foresee events that could impact Bella and the others. Vampires can be made to seem more human - like in their emotions or they could be the ultimate predators, and it all depends on how the author wants to tell the story in the fanfiction.
One interesting aspect could be how their relationship dynamics change. In the original, Edward was the vampire and Bella was the human, so reversing their roles might lead to a different power dynamic. For example, Bella as a vampire would have more physical strength and speed, which could make her more protective of Edward. Also, Edward as a human might struggle with his mortality compared to Bella's immortality, creating new tensions and storylines in the fanfiction.
To adapt to her new vampire life in the fanfiction, Bella has a long journey. At the beginning, she struggles with her speed. She might accidentally run too fast and crash into things. But with Alice's guidance, she learns to control it. Her vision also changes, and she has to learn how to focus in different lighting conditions. Socially, she has to interact with other vampires. Some might be friendly, like those in Alice's coven, but others could be hostile. She has to learn how to defend herself and navigate the complex vampire politics. She also has to come to terms with the fact that she'll live forever now, which means leaving behind her human concept of time and mortality.
One major theme is acceptance. Jasper has to accept Alice's human nature with all its weaknesses and Alice has to accept Jasper's vampiric nature. Also, the theme of danger often comes up. Since Jasper is a vampire, there are threats from other vampires or vampire - related elements that endanger Alice.
Another good one is 'The Vampire's Mate'. It delves deeper into the vampire lore and how Bella, as a human, fits into their world. The relationship between Edward and Bella is portrayed in a more intense and detailed way, which makes for a very engaging read.
One common theme is the exploration of power dynamics. Since Bella is a vampire and Edward is human, it changes the traditional power balance in their relationship. For example, Bella may have to protect Edward from other vampires.
Love against all odds is a very common theme. Since they are from different species, there are a lot of obstacles in their relationship. For example, in many fanfictions, Bella has to control her vampire instincts around Edward, which adds a layer of tension.
The main characters are Edward, who is a vampire, and Bella, who is a human. Edward is often depicted as mysterious, brooding, and having a strong sense of protection towards Bella.