A great plot twist could be that when Bella becomes a vampire, she finds out that there is a secret society of vampires that she is now a part of. This society has different rules and a whole new world order that she has to navigate. She might have to fight against some of the older vampires in this society to protect her family and friends.
Perhaps a really unexpected plot twist is that Bella's transformation into a vampire was all part of a prophecy. And as she becomes a vampire, she starts to have visions about a great danger that is coming to the vampire and human worlds. So she has to use her new vampire abilities to try and prevent this catastrophe.
One interesting plot twist could be that Bella, as a new vampire, discovers she has unique powers that no other vampires have. For example, she might be able to control the elements in some way.
One interesting plot twist could be that Bella's transformation into a vampire gives her a unique power that no other vampire has. For example, she might be able to control the weather. Another twist could be that instead of joining the Cullen family right away, she runs off on her own to explore the vampire world. Maybe she discovers a whole new coven that has different values and ways of life compared to the Cullens.
In some fanfics, a possible plot twist is that Bella, as a vampire, has a different sire than Edward. This could lead to a whole new set of alliances and rivalries. Maybe her new sire has a dark past or is part of a vampire clan that is at odds with the Cullens. This would force Bella to re - evaluate her loyalty and her place in the vampire world.
Well, one common plot twist could be that the kidnapper is actually a long - lost relative of Bella's with a hidden agenda. Another might be that the kidnapping was a set - up by a jealous vampire from another coven who wants Edward for themselves. And sometimes, it could turn out that Bella has some sort of hidden power that the kidnapper is trying to either use or suppress.
Well, a plot twist might be that the baby has a special connection to an ancient vampire clan that no one knew about. This could lead to a whole new storyline where they try to claim the baby. Also, Bella could experience a vision during the birth that reveals a future event that changes the course of the 'Twilight' world. Maybe she sees a great war coming and this knowledge makes everyone around her change their plans. It could also be that the baby's birth causes some sort of magical ripple effect that starts to change the abilities of other vampires in the area.
One common plot twist could be that the kidnapper is actually a character who was thought to be dead in the original Twilight series. This sudden revelation can completely change the direction of the story.
One interesting plot twist could be that Buffy becomes a vampire but still retains some of her Slayer powers. This creates an internal struggle as she has to fight her new vampire instincts while also using her old skills. Another could be that she turns into a vampire and finds out that there's a whole new level of vampire society that she was unaware of, which changes her perspective on the whole vampire - slayer dynamic.
One common plot twist is that Bella's mermaid identity is revealed in a very unexpected way. Maybe during a swim with the Cullens, she suddenly transforms, shocking everyone. Another is that her mermaid powers are somehow connected to the Volturi's plans, adding a new layer of danger.
One idea could be that Hiccup's transformation into a vampire gives him enhanced abilities like super speed and strength. This could make him an even more formidable dragon trainer as he can keep up with the dragons better. He might also have to deal with the thirst for blood, which could be an interesting internal struggle. Maybe he tries to find a way to control it without harming anyone, like finding a substitute for blood.
Edward would still be a very important character. Since he's Bella's love interest in the original 'Twilight' series, in the fanfiction, he would play a major role in Bella's new vampire life. He might help her adjust to her new powers and the vampire lifestyle.
One plot idea could be that Bella's sister discovers she has a special power as a vampire, like being able to see the future. This could lead to her trying to prevent bad things from happening to her family and the Cullen family. Another idea is that she struggles with the morality of being a vampire while also being in love with a human. She might try to find a way to exist without harming humans, which would create a lot of internal conflict.