There might be a fanfiction where Bella's common sense helps her in her relationships. She realizes that some of the possessive behaviors in her relationships are not healthy and uses her common sense to communicate better and set boundaries. This could lead to more stable and equal relationships in the story.
One possible fanfiction could be where Bella uses her common sense to avoid the dangerous situations she often gets into in the original story. For example, instead of running off into the woods alone at night, she stays home and figures out a more rational way to deal with her feelings for Edward.
A common theme could be friendship. Since Bella and Alice are involved, their bond is often explored. Another theme might be Bella's challenges in her Marine GP career and how Alice supports her.
You could also ask in fanfiction communities. They might be able to point you to some great 'Bella has common sense' fanfictions. Some of these might involve Bella using her common sense to solve mysteries within the Forks community that are related to the supernatural elements in the story.
One popular 'Naruto has common sense' fanfiction might be 'Naruto: The Sensible Shinobi'. In this fanfic, Naruto makes more practical decisions compared to the original story. For example, he doesn't blindly rush into dangerous situations without a proper plan.
Family is also a big theme. Some fanfictions might explore how Bella fits into the family dynamic when she's around Edward or Tanya. It could be about how she becomes part of their extended family or how they all interact like a family. Also, adventure can be a theme. They could go on an adventure together, like exploring a new place or solving a mystery. This gives the characters a chance to bond and grow without any adult - related stuff.
One common theme is the struggle with the unexpected. Since imprinting is such a strong and sudden connection in the Twilight universe, fanfictions often explore how both Leah and Bella struggle to come to terms with this new bond that goes against the normal relationships in their world.
One common theme is identity. Bella has to grapple with who she is now that she has a different family origin. Another theme is power dynamics, as being Caius' daughter would likely place her in a different position of power within the Twilight universe. Also, family relationships are explored, like how her new connection to Caius and the Volturi would affect her relationships with the Cullens.
Power is a common theme. When Bella is a Death Eater, she often has to deal with the power dynamics within the group. Another theme is the loss of innocence. She has to let go of her previous self - concepts and embrace the dark and often cruel world of the Death Eaters.
One common theme is the exploration of new powers. Since they are witches, they get to discover and master different magical abilities.
One common theme is the exploration of the relationship between Carlisle and Bella. Since they come from different worlds, the pregnancy forces them to re - evaluate and strengthen their bond.
Loneliness and how to overcome it is a very common theme. Bella has to deal with being alone in these fanfictions, and it's about how she copes with that. Also, growth is a major theme. As she's alone, she can grow as a person, whether it's in terms of her confidence or her understanding of the world.