The two main characters are Bella and Dr Doogie. Bella could be a creative type, perhaps a writer or a dancer. Dr Doogie is the medical professional. In the fanfic, they would interact with each other, and also with other secondary characters. But the focus would always be on how Bella and Dr Doogie's relationship develops within the context of their marriage.
One possible plot could be that Bella and Dr Doogie face challenges in their marriage due to their different professional lives. For example, Bella might be an artist and Dr Doogie's long hours at the hospital could cause some friction. However, they learn to support each other and grow closer through their shared love for helping others in the community.
Friendship is often a theme. They might start out as strangers but through various events, they form a deep bond. For example, Dr Doogie could help Bella when she is ill, and from that, their friendship blossoms. Another common theme could be the power of knowledge. Dr Doogie with his medical knowledge and Bella with whatever skills she has (maybe she's an artist and can see things in a different way), they use their combined knowledge to overcome challenges.
There could be a fanfic where Bella, who might be a journalist in this story, is writing an article about Dr Doogie's revolutionary medical techniques. As she follows him around for the story, they develop an unexpected friendship that turns into something more. It would be a really interesting take on their relationship.
The main characters are obviously Bella and Edward. Bella is the human who has fallen in love with Edward, a vampire. Their relationship forms the core of the story.
The main characters are clearly Elijah and Bella. Since they are married in this fanfiction, they are likely at the center of the story, with their relationship being the main focus.
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 a main character. Since it's a wereanimal fanfic, there might be an alpha wereanimal character who guides or challenges Bella.
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.