One possible plotline could be Harry struggling to control his new vampire instincts while still trying to protect his friends at Hogwarts. He might have to deal with the thirst for blood while attending classes and facing off against the Dark Arts. Another could be that he discovers a whole new vampire community within the wizarding world that has its own rules and power structures.
Perhaps a plotline where Harry's transformation into a born vampire gives him unique powers that no other vampire has. This could lead to him being hunted by both the vampire elders who fear his power and Voldemort who wants to use him for his own evil plans. He would then have to find a way to master his powers and stay alive in this dangerous situation.
In some fanfictions, the plot could revolve around Harry's relationships changing. For example, his friends might be initially afraid of him, but as he shows he can control himself, they learn to accept him again. Also, there could be a romantic sub - plot where a female vampire is attracted to Harry because of his unique status as a wizard - turned - vampire, and he has to navigate these new feelings while dealing with his overall transformation.
Well, in some 'Buffy turns into a vampire' fanfiction, there could be a plot where Buffy has to deal with the rejection of her friends at first. But then they realize that she's still Buffy deep down. Also, she could team up with some vampires who oppose the more evil ones, using her new vampire abilities for good in a way that no one expected.
One interesting plotline could be Edward exploring his unique vampire abilities from birth. For example, he might have a different way of controlling his thirst compared to other vampires. Maybe he has an innate power that helps him resist the urge to hunt humans more effectively.
Well, a common plotline is Bella's discovery of new vampire senses. In fanfiction, it could be that she discovers she has a unique sense that other vampires don't have, like being able to sense the emotions of humans from a great distance. Also, there could be a plot where Bella has to hide her new vampire self from her human family and friends, which creates a lot of tense and emotional moments as she tries to keep her double life a secret.
One possible plotline could be that Harry is influenced by a dark artifact. For example, he discovers a cursed object that slowly corrupts his mind, making him turn against his friends. He might start to use dark magic to achieve his goals, believing that the end justifies the means.
One possible plotline could be Harry struggling to control his new veela - like charm powers and accidentally causing chaos at Hogwarts. For example, he might make his classmates act strangely around him, much to the confusion of his friends.
A great plotline could be that Harry, now a girl, has to navigate the world of wizarding fashion and etiquette which she previously ignored. She might be forced to attend more social events at Hogwarts, like balls or tea parties, where she has to learn proper behavior. And she could also use her new identity to her advantage when it comes to spying on the Death Eaters. They might underestimate her because she's a girl, but she could outwit them.
In some 'Harry Potter turns into Hermione fanfiction', the plot may involve Harry adjusting to Hermione's physical appearance as well. He might be shocked at first but then realizes the advantages it gives him. For example, he could use Hermione's reputation for being a bookworm to his advantage when it comes to researching dark magic or hidden secrets in the library. And he may also face some difficulties when it comes to Hermione's friendships with other girls, as he has to act like her and keep those relationships intact.
Another plotline might involve Harry's transformation leading to him having new magical abilities related to his vampire state. He could discover that he can now move with super - speed through the halls of Hogwarts, which both helps and hinders him in his adventures. He also might have to deal with the fact that some vampires in the fanfiction world view him as an oddity since he was once a wizard and now a vampire.
Obviously, Harry Potter himself would be the central character as he is the one undergoing the transformation into a born vampire. His friends like Hermione and Ron would also be important characters. They would likely play a role in either helping Harry adjust or being conflicted about his new state.
One possible plotline could be that as a girl, Harry might face different challenges in the wizarding world. For example, she may have to deal with more traditional gender roles that still exist in parts of the wizarding society. Maybe she has to fight harder to be taken seriously in Defense Against the Dark Arts class, which is often seen as a more male - dominated area in the original series. Another plotline could be her relationships with male characters like Ron and Hermione. Her friendship with Ron could potentially develop into a different kind of relationship, or her bond with Hermione could be even stronger as they face the challenges of being female in a world that still has some biases.