Her presence can introduce a whole new layer of backstory. For instance, if the fanfiction focuses on Joker's origin, Bella's relationship with him can be a key factor in shaping who he becomes. It could be that her actions or inactions lead to his transformation into the Joker.
Bella as the mother can also be a catalyst for character development in other characters. If there are other characters in the fanfiction who interact with Joker, they may also have to deal with Bella. This can create new conflicts or alliances. For example, if there's a detective trying to understand Joker, Bella's existence and her relationship with Joker can make the detective's job more complex as he has to consider this family connection.
Often, Bella's injury can add drama. It can make the readers worry about her future in the team. If she's the star player, the team might struggle without her on the field at first. This can create suspense as to whether she'll recover in time for important games.
Well, it would likely bring a whole new level of complexity. Bella being the mother means she has a different kind of authority. She might be more protective than before. For example, she could be stricter with the younger Cullens in terms of their interactions with humans. Also, her relationship with Edward would shift from being his lover to also being his mother - figure in a way, which could be quite strange and might lead to some internal family tensions as they all adjust to this new dynamic.
The plot would be turned upside down. Victoria's main goal in the original series was to avenge James. If she was Bella's mother, she might use Bella as a pawn in her vendetta against the Cullens in a different way. The love story between Bella and Edward would likely take a backseat as the power struggle between Victoria and the Cullens becomes more central. Also, Bella's character would develop differently. Instead of being a normal girl falling for a vampire, she'd be a girl caught in the middle of her mother's war with the Cullens.
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.
It can make the plot more complex. For example, it may lead to Bella having to make choices between following Carlisle's orders and her own instincts.
Often, she is portrayed as a very empathetic character. Since she is Mother Nature, she has a deep understanding and love for all living things. So she might be shown as someone who is always ready to help a wounded animal or a dying plant.
Well, she might be very protective. Since Joker is often in chaotic and dangerous situations, she could be constantly worried about his well - being and try to shield him from harm in the fanfiction world.
Well, one possibility could be that Bella Swan has to deal with the chaos that comes with being the Joker's daughter. Maybe she struggles to balance her normal life, like in Forks, with the dark and unpredictable world of her father. She might have some of the Joker's traits, like a wild sense of humor but also a bit of madness that she has to control.
In this fanfiction, the relationship between Bella and Edward is turned on its head. Bella's role is now to shape Edward's character from a young age. Their interactions will be less about the intense passion of the original story and more about the tender, sometimes difficult, bond between a mother and son. She might worry about his future, his choices, and his safety in a way that is very different from the love - based concerns in the original narrative.
The baby sister might also attract the attention of other supernatural beings. If she has an alluring scent like Bella, it could draw vampires or werewolves towards her. This would force Bella to take on a protective role and might lead to new alliances or battles in the Twilight universe. For example, the Cullens and the werewolves might have to work together more closely to keep the baby sister safe.