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.
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.
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.
It could be a magical alternate universe fanfic where the Notts take Hermione in for various reasons related to magic or family ties.
He might gain enhanced physical strength. The devil gene could give him a boost in his taijutsu skills, allowing him to overpower opponents more easily.
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.
Maybe the story is about Hermione being adopted into a Muggle family in England. She would have to hide her magical abilities while also trying to find a way to reconnect with the wizarding world. It could be a tale of her struggle to balance her two lives, and perhaps she meets other magical beings in secret who help her keep her identity hidden and guide her on how to get back to the wizarding world when the time is right.
She could inherit some of Sirius's traits. For example, his rebellious streak might make Hermione more willing to break the rules when it's necessary to achieve a greater good.
She could be shocked at first. Just imagine, she thought she knew her family all this time, and then bam, she's adopted. She might be angry too, especially if she feels she's been lied to. But also, she could be curious and eager to find out more about her real family.
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.
Perhaps he could have some sort of dark - based chakra manipulation. Demons usually have unique chakra, and Naruto's demon part might allow him to use a different form of chakra that gives him new jutsu, like the ability to create shadowy clones or dark - energy attacks.