Well, for one, she could inherit the vampires' immortality which in itself is a huge power. In addition to that, given the Cullens' unique abilities, Hermione might gain something related to her senses. Maybe her vision could become extremely sharp like a vampire's, allowing her to see in the dark or detect the slightest movements. And considering her magical background, there could be an interesting fusion of her magic with the vampire powers. For example, she could use her magic to enhance her new vampire - like abilities even further, creating a whole new set of powers that are unique to her within the Cullen family.
If Hermione was adopted by the Cullens, she could gain some really interesting powers. The most obvious would be the physical enhancements that vampires have, such as increased strength and speed. But Hermione's intelligence could also lead to a unique power development. Maybe she could develop a power to manipulate the minds of others in a more sophisticated way than the Cullens can. She could use her knowledge of magic and combine it with her new vampire nature to create spells or abilities that are specific to her. For instance, she could create a spell that allows her to move undetected among humans even more effectively than the Cullens' natural abilities, by using a combination of her magic and her new vampire - like stealth.
If Hermione was adopted by the Cullens, her character would likely become more attuned to the vampire world's values. She might be more secretive like the Cullens, as they hide their true nature. Her studious nature could be redirected towards understanding vampire lore. For example, instead of poring over Hogwarts textbooks, she'd be delving into books about vampire history and abilities. This new family dynamic would also make her more cautious in her interactions, knowing the potential danger her new family could face if exposed.
She could gain powers related to female energy in magic. Maybe she could master spells for healing or protection on a much larger scale. For example, she could create a powerful shield around a whole village.
It could be a magical alternate universe fanfic where the Notts take Hermione in for various reasons related to magic or family ties.
She could have the power of super - intelligence as a demigod. This would make her even smarter than she already is in the original story, allowing her to understand complex magical theories and ancient spells with ease.
Hermione's relationship with the other characters would be transformed. With the Weasley family, she might be a bit more of an outsider, yet also have a newfound respect for family bonds. As for Draco and the Slytherins, her new family situation might make them more curious about her. And her relationship with Sirius could be really interesting, as he was Remus' friend. They could bond over their shared connection to Remus, and Sirius might see Hermione as a new hope or something to protect.
Hermione could inherit Merlin's powerful transfiguration abilities. Given that Merlin was one of the most powerful wizards in history, his descendant Hermione might be able to perform extremely difficult transfiguration spells with ease. Like transfiguring large structures or multiple objects simultaneously, something that is usually very challenging for most wizards.
One great 'Adopted Hermione' fanfiction is 'A New Family for Hermione'. It beautifully portrays Hermione being adopted into a loving magical family. The story delves into how she adjusts to this new family dynamic while still maintaining her strong, independent character. It also shows how her new family helps her grow in different ways, especially in terms of her magical abilities outside of Hogwarts studies.
Well, in general, fanfiction about an adopted and abused Hermione is a rather dark concept. Ethically, it's a gray area. On one hand, fanfiction allows for creative exploration, but this theme might be disturbing to many. It could be seen as unethical if it promotes or glorifies abuse in any way.
One possibility could be that Sirius sees Hermione's intelligence and determination and decides to take her under his wing. Maybe he realizes her potential and wants to protect her from the dangers in the wizarding world that he has faced himself.
She'd probably have an interesting relationship with the Avengers. With her intelligence, she could quickly become a valuable asset. For example, she might bond with Bruce Banner over their shared love for knowledge. Banner would be interested in her magical knowledge, and she in his scientific expertise. As for Captain America, he might see her as a young person in need of protection at first, but soon respect her abilities.