Obviously, Bella is a main character. Since it's a wereanimal fanfic, there might be an alpha wereanimal character who guides or challenges Bella.
There could be a human friend of Bella's who is unaware of her wereanimal side at first. This friend might play an important role in Bella's life, and when they find out about her secret, it could create a lot of drama.
One popular theme could be the struggle of Bella with her new wereanimal identity. For example, she might have to deal with the sudden changes in her body and instincts.
Well, Bella is the central figure in 'bella the babysitter fanfic'. Then there could be recurring characters like the family she babysits for most often. There might be a single dad in that family who is always running late to pick up his kids, adding some stress to Bella's job. There could also be a best friend of Bella's who gives her advice on how to handle difficult babysitting situations, or a local store owner where Bella buys things for the kids she babysits, and they have friendly chats that add to the story's charm.
Bella is the central figure in these fanfics. Then, there could be new characters created specifically for the fanfic. But in terms of the original series, Edward is bound to be there. He'll have to adapt to Bella's new status. Also, Jacob might still be in the picture, perhaps having a more complicated relationship with vampire Bella. And of course, the other Cullens, who will be her family in the vampire world, are main characters as well.
In some Bella Sister fanfic, there might also be side characters like their friends. These friends could play important roles in the sisters' lives, perhaps helping them in their quests or providing comedic relief. Their parents or guardians could also be part of the story, influencing the sisters' decisions and actions.
Obviously, Bella is the main character as she is the succubus. There might also be a love interest, perhaps a human or another supernatural being. For example, in some fanfics, there could be a vampire character who becomes intrigued by Bella's succubus nature.
As I don't know the specific 'bella cancer fanfic', it's hard to say for sure. But presumably, Bella would be one of the main characters since she is in the title. There might also be her family members, like her parents or siblings, and perhaps her friends or a love interest who play important roles in the story.
It really depends on the specific fanfic. There could be her husband, who would be a central character as well. He might be the one that Bella is trying to be the perfect wife for. There could also be friends or family members. Maybe a nosy neighbor who adds some comedic relief or a mother - in - law who has high expectations of Bella. In some cases, there could be a rival character, someone who is jealous of Bella's relationship or her status as the perfect wife.
The main characters are Bella and Edward, of course. Bella, a human turned vampire, and Edward, a vampire with special abilities. They are the central focus of the fanfic during their honeymoon phase.
Obviously, Bella and the Cullen family are the main characters. Bella is the adopted one. The Cullen family includes Edward, who has a special relationship with Bella, Carlisle who is like the father figure, Esme the motherly figure, and the other Cullen siblings like Alice, Jasper, Rosalie, and Emmett.
Obviously, Bella is one of the main characters. She is the one being adopted into the Cullen family.