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.
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.
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 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.
One great 'bella swan and charlie lemon fanfiction' is 'A Father's Concern'. It delves into Charlie's perspective as he starts to notice some strange behavior in Bella. It really brings out the protective nature of Charlie in a unique way.
The family dynamic is a key element. Charlie being Bella's father creates a unique relationship. For example, his protectiveness towards her. Also, the setting of Forks can add an interesting backdrop. It's a small town with its own secrets and that can play into their relationship.
Well, it might show Bella Swan as more assertive in her feelings compared to the original. As for Charlie, it could depict him as having more complex emotions towards Bella. For instance, Charlie may have a deeper understanding of Bella's inner turmoil.
She might be portrayed as a villain by showing her being manipulative. For example, she could use her relationship with other characters to get what she wants, like using Edward's love for her to control his actions or decisions.