A fanfiction that delves into the backstories of the minor characters in Twilight could be great. For instance, exploring the story of one of the werewolves before they met Bella and the Cullens. What were their lives like? What challenges did they face? This would add more depth to the Twilight universe without having to go down the inappropriate route of Bella and Charlie having an improper relationship.
One alternative could be a fanfiction about Bella's adventures in the vampire world that focus on her friendship with other vampires outside of the Cullen family. For example, she could form an alliance with a nomadic vampire and they go on a journey to discover more about vampire history.
In the world of Twilight fanfiction, the main focus is often on romantic relationships within the age - appropriate and established character pairings. A story with Bella and Charlie in such an inappropriate relationship would not only be against the family dynamic in the original story but also likely violate the ethical and moral standards of the fanfiction community. So, it's highly improbable to find a 'family - friendly' fanfiction with this plot.
Fanfiction that delves into Bella's artistic side could be really interesting. Maybe she discovers a passion for painting or writing, and the story could show how her creativity is influenced by her unique experiences. Also, fanfiction about Bella mentoring new vampires or werewolves in the ways of their respective worlds would be a cool concept. It would show her growth from a newbie to an experienced and respected figure in the supernatural community.
I'm not aware of it being a particularly popular fanfiction. There are so many 'Twilight' fanfictions out there, and ones that deviate so far from the original story's relationships may not gain mainstream popularity.
I'm not sure specifically as it's a fanfiction. Fanfictions can have a wide variety of interpretations and storylines. It might explore an alternate scenario where Charlie Swan and Bella are in a relationship that leads to such a situation, but this goes against the original 'Twilight' story's intended relationships.
Another theme is mystery. Charlie often senses that there's something different about Bella but can't quite put his finger on it. This mystery element keeps the readers engaged as they wait for Charlie to discover the truth about Bella's new life. Some fanfictions really play up this aspect well.
One idea could be that Bella Swan uses her unique perspective, perhaps from her experiences in the Twilight world, to solve cases in the NCIS setting. For example, her ability to read people, which she might have developed while dealing with vampires and werewolves, could help her in interrogations.
One idea could be a story where Bella discovers the world of the Mikaelsons after being turned into a vampire. She crosses paths with Elijah and they form an unlikely alliance to deal with a common threat in the supernatural world. They learn from each other's experiences, with Bella's knowledge of the Volturi and Elijah's centuries - old wisdom.
One possible storyline could be Bella Swan's coming - of - age journey in a more unique way than in the original story, while also exploring her relationship with Charlie in a new light. For example, perhaps she discovers a hidden side of Charlie that changes how she views him.
Another concept could be that a character from Sons of Anarchy has a vision or encounter similar to Bella's transformation in Twilight. This could lead to a whole new set of challenges and changes within the Sons of Anarchy universe. It might also bring a new dynamic to the relationships within the gang as they try to figure out what's happening to their comrade.
One idea could be a story where Bella Swan, after the events in Twilight, discovers a new world parallel to her own and meets Jason Momoa's character who is a powerful warrior from that world. They team up to fight a common enemy that threatens both of their realms.