Many badass Bella fanfictions explore themes of her leadership. She could be leading a group of vampires, humans, or a combination of both against common enemies. There's also often a theme of her breaking free from the traditional gender roles in the Twilight series. Instead of just being the love interest, she becomes a force to be reckoned with, making her own path and decisions that impact the entire world of Twilight.
Another theme is the transformation of Paul's character. Often, in these fanfictions, he starts out as a rather rough or wild character, but through his relationship with Bella, he becomes more gentle and understanding. For example, in some stories, he learns to control his temper better. The third common theme is the idea of a different kind of pack dynamic. With Bella being involved with Paul, it changes the way the pack views her and also how they interact with Paul. It can create some interesting power struggles and alliances within the pack.
One common theme is the exploration of different gender roles. Since Bella is male in these fanfictions, it often shows how he navigates the relationships in the Twilight world differently. For instance, his courtship with Edward might have different dynamics compared to the original story.
One common theme is the exploration of an alternative relationship. Since in the original 'Twilight' series, Bella is mainly focused on Edward, fanfictions often look at what could happen if she had a stronger connection with Jasper. Another theme is the power dynamic. Jasper's ability to control emotions and Bella's resistance to it can create some really interesting scenarios.
Love is another prevalent theme. Bella and Edward's love extends to their love for their child. And there's also the love of the Cullen family for the baby. Additionally, the theme of the baby's special abilities or powers is common. Because in the Twilight world, the baby is a unique hybrid, fanfictions often explore what these powers mean and how they affect the baby's life and the people around it.
Friendship is a common theme. Since Bella and Alice have such different personalities in the 'Twilight' series, fanfiction often explores how they can form a deep bond in various situations. For example, in some stories, they become friends despite their initial differences in the way they view the vampire - human world.
One common theme is the exploration of Bella's identity. Since she's a mermaid in these fanfictions, it often looks at how she reconciles her new mermaid self with her human side. Another theme is the relationship changes. Her being a mermaid can greatly impact her relationships with Edward, Jacob and others.
One common theme is the mother - daughter like relationship. Esme often takes on a maternal role towards Bella. Another theme is protection. Esme wants to protect Bella from the dangers of the vampire world.
The theme of self - discovery is also prevalent. Bella, in the role of a nanny, discovers new things about herself. She might find out she has new strengths or weaknesses. For instance, she could learn that she's more resilient than she thought when facing the supernatural events that occur around the Cullen household while taking care of their children.
Family also often plays a big role. Some 'baby bella twilight fanfiction' might focus on Bella's family relationships when she was younger. It could explore how her relationship with her parents differed before the events of the main Twilight story, and how those early family bonds affected her development.
One common theme is the exploration of Bella's transformation into a vampire in more depth. Another is the relationship between Bella and Edward, but often with a new twist. For example, some fanfictions might focus on how they deal with different challenges as vampires together.