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.
In many of these fanfics, Bella is the central figure. Alongside her, there could be a wizard or a witch who either helps or hinders her. Another common character could be a demon hunter who is initially after Bella but then realizes she's not all bad. These characters add drama and conflict to the story.
Obviously, Harry would be the main character as the title indicates his transformation into a succubus. His friends like Hermione and Ron are likely to be important secondary characters. They would play a role in either helping Harry come to terms with his new nature or being initially suspicious of the changes in him.
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.
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.
Since I don't have extensive knowledge of 'bella succubus drain fanfic', it's hard to say precisely. However, in many succubus - centered fanfics, themes of temptation, the struggle between good and evil, and the allure of the otherworldly are often explored. This might also be the case for 'bella succubus drain fanfic'. Additionally, the idea of 'drain' could potentially involve themes of energy or essence extraction, which could tie into power - related themes.
One popular story could be 'Bella's Succubus Adventure' where she navigates the world of the supernatural while dealing with her succubus nature. Another might be 'Bella: The Succubus Among Us' which focuses on how she hides her identity in a normal human world.
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.