One possible plot could be Bella's journey to discover more about her father Joshua. Maybe she stumbles upon some of his old secrets or talents that she never knew about. This could lead to a series of adventures as she tries to understand who he really was in his youth and how it has influenced her life.
The plot could center around Bella's role in the Cullen family's relationships with other supernatural beings. As Esme and Carlisle's daughter, she has a certain status. She could try to bridge the gap between the Cullens and the werewolves in a more official capacity. This could involve her facing opposition from within her own family as well as from the werewolves, but she perseveres in her attempts to create peace.
The plot could involve Bella being raised in the Twilight world without knowing her real mother. Then, through some magical event, she finds out she's Bellatrix's daughter. This could lead to a conflict as she tries to figure out where she truly belongs, between the two very different worlds of vampires and wizards. Also, there could be a plotline where she has to face the dark legacy of her mother and decide whether to embrace or reject it.
Bella would likely develop a sense of identity based on her relation to Joshua. She might start to take on some of his traits, either positive or negative. For instance, if Joshua was known for his bravery, Bella could find herself being more courageous in difficult situations.
Well, it could be a story about family secrets. Maybe Bella has just discovered that Billy is her father and she has to deal with the shock of this new information while also getting to know Billy and his side of the family.
In a 'bella is thor's daughter fanfiction', the plot could involve Bella being whisked away to Asgard. There, she has to learn about her father Thor and the ways of the Asgardians. She might get into trouble with the other Asgardians who are skeptical of her because she's from a different place. But as she proves herself, she could form alliances and help Thor in some great battle or quest, all while coming to terms with her new identity.
One possible plot could be Bella growing up not knowing who her father is. Then, as she discovers her true identity, she has to decide whether to follow in Voldemort's dark footsteps or rebel against him. She might face a lot of internal conflict as she tries to balance her own values with the legacy of her father.
Well, it could be about Damon having to protect Bella from the various threats in their supernatural world. Maybe she has some unique powers that draw unwanted attention.
One possible plot could be Bella growing up in a world filled with the supernatural elements that Rebekah is a part of. Maybe she discovers her powers early on and has to learn to control them while also dealing with the complex family dynamics of being Rebekah's daughter. For example, she might face the expectations of the vampire community that Rebekah is associated with.
Well, it could be about Bella trying to break free from her father's, the Joker's, evil influence. Maybe she has a good heart in contrast to him and wants to use her skills for good, like helping Gotham in a more positive way.
Well, it could involve Bella discovering her true heritage as Elijah's daughter. Maybe there are conflicts with other characters who have different intentions regarding her. For example, some might want to use her for power, while she just wants a normal life.