Well, 'mortal - vampire relationship struggles' is a very popular theme. It delves deeper into the difficulties they faced in the original story, like Bella's aging and Edward's immortality. 'Secret pasts' is another theme. Writers might create a backstory for either Edward or Bella that changes the dynamic of their relationship. And 'adapting to new situations' is a theme that often shows how they deal with changes in their lives, such as moving to a new place or dealing with new vampire laws.
A common theme is the 'what - ifs'. What if Bella had chosen Jacob instead? Fanfictions often explore this alternative storyline and how it would affect the vampire - human relations in Forks. It can be really interesting to see how the characters develop in this different scenario.
Another theme is Renesmee's growth and development. Fanfictions often explore how she learns about her powers and her place in the vampire - human - hybrid world. It can be really interesting to see how she matures and how her relationships with her parents and other characters change as she grows. Some fanfictions also focus on her friendships and how she navigates the social aspects of her world.
The most popular themes usually revolve around their unique love story. For instance, the idea of Edward and Bella having a more adventurous relationship, traveling to different places in the world while dealing with their vampire - human relationship. Another is the theme of family. How they create a family together, including Bella's transformation into a vampire and how they raise their child in the fanfiction world. There's also the theme of sacrifice, where either Edward or Bella has to sacrifice something for the sake of their relationship.
One of the most popular themes is the exploration of their eternal love. Since they are in a vampire - human relationship, many fanfictions focus on how their love can last forever despite the differences. Another theme is Bella's transformation. Writers often explore what it would be like for Bella to become a vampire and how that would change her relationship with Edward.
Jacob might also be a popular character in some of these fanfictions. His relationship with Bella in the original series was complex, and in fanfiction, it can be further explored, even in the context of Bella and Edward's relationship, creating a sort of love triangle - like dynamic.
Another theme is the protection aspect. Edward is always protective of Bella, and fanfics play with this idea, creating new threats and situations where Edward has to protect Bella in more extreme ways.
Love is a very common theme, just like in the original series. The intense, all - consuming love between Edward and Bella is often explored further in fanfiction. It might show different scenarios where their love is tested or strengthened.
Love is a very common theme. It's often explored in more depth than in the original. For example, how their love endures different challenges. Another common theme is the struggle with Bella's humanity and Edward's vampirism. Fanfictions might play with this aspect more, like what if Bella had a harder time accepting Edward's true nature.
In 'Twilight Vampire Bella fanfiction', a very common theme is the 'what - if' scenarios. For example, what if Bella had chosen Jacob instead of Edward? Or what if she had never become a vampire? Also, the theme of Bella's role in the vampire society is quite popular. How she changes the dynamics, brings new ideas, and faces opposition from the traditional vampire ways. There's also the theme of her family relationships in the vampire world, like how she interacts with the Cullens and other vampire families.
There's also 'The Volturi's Princess' in which Bella has a different kind of encounter with the Volturi and her relationship with Edward takes on new twists and turns. It delves deeper into the vampire politics and how their love endures through it all.