Perhaps in the fanfiction, Bella is part of a hidden community of 'children of the moon'. There could be a plot where she has to prove herself to this community and face challenges that test her loyalty and abilities. For example, she might have to complete a difficult task during a full moon to be fully accepted.
Another plot might involve a conflict between Bella and an antagonist who wants to use her connection to the moon for their own evil purposes. This could lead to a series of adventures where Bella has to outwit the antagonist and protect her friends and family while also coming to terms with her new identity as a 'child of the moon'.
One interesting plot could be the child having special powers inherited from both Edward and Bella. For example, the child might have the ability to read minds like Edward and also possess Bella's strong will. Another plot could be the child's struggle to fit in with both the vampire and human worlds. Maybe they face challenges at school because they are different from the other kids.
It's possible that there are some friends of Bella's who play important roles. They could be normal humans who are initially unaware of Bella's connection to the moon but gradually become involved in her adventures. Maybe they help her in different ways, like providing emotional support or using their own skills to assist her in difficult situations.
Perhaps in the 'bella as a baby fanfiction', there's a plot where Bella is a baby and she has a special connection to a magical or supernatural element in the world. For example, she can see fairies or spirits that others can't. This would create a lot of mystery and adventure as those around her try to protect her or figure out what she's seeing.
Well, in some 'bella is immortal fanfiction', a common plot is her finding other immortals like herself. They could form a sort of community or family. Maybe there are rules among these immortals that Bella has to learn and adapt to. For instance, there could be a code about not revealing their immortality to mortals in a certain way. Another interesting plot could be Bella using her immortality to pursue knowledge. She has all the time in the world to study various fields like art, science, and philosophy. She could become a great scholar or artist over time. Also, there might be a plot where Bella has to hide her immortality from her old friends and family who still think she's mortal.
Well, in some plots, Bella might use her psychic powers to predict future events in the fanfiction world. For example, she could foresee danger coming to her friends and take steps to prevent it.
Another plot could be that there's some sort of mystery or danger at the prom. Maybe a rival vampire group shows up, and Edward has to protect Bella while still trying to make their prom night special. They might have to dance and be romantic in between fending off attacks.
One possible plot could be how Jacob and Bella deal with the reactions of their families and friends. Maybe some are supportive while others are shocked.
One interesting plot could be that Klaus and Bella meet in a mysterious forest. They initially clash due to their different natures but gradually find a connection. Another plot might involve Bella having some special power that Klaus is intrigued by and he tries to figure it out while falling in love with her.
One interesting plot could be Bella developing a new power while living with the Cullens. For example, she might gain the ability to communicate with animals like some of the other vampires. This would add a new dynamic to her relationship with the Cullens and also pose new challenges and adventures as they try to keep it a secret from the outside world.
One interesting plot could be Rosalie teaching Bella how to be more confident in herself. Since Rosalie is strong - willed, she might pass on some of that strength to Bella. Another plot could involve Rosalie protecting Bella from the other vampires who might not be so accepting of a human in their midst at first.