Hermione might develop powers of divination within the coven. Since covens often have a connection to nature and the spiritual side of magic, she could start seeing visions of the future that are related to the well - being of the coven or the wizarding world at large. The coven's collective knowledge and energy could enhance her natural abilities in this way.
It's possible that she gains the power of telepathy or empathy within the coven. This would allow her to better understand the emotions and thoughts of the other members, which would be useful for their group activities. She could also use this power to communicate secretly during dangerous situations in the fanfiction, like when they are facing a powerful dark wizard.
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.
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.
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.
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.
He could probably gain the ability to phase through objects. Just like wraiths are often depicted as being able to pass through solid things. This would give him an edge in combat and also in sneaking around.
Well, it could mean that Hermione is part of a group of female witches. They might gather to practice magic together, share spells and knowledge. Maybe they work towards a common goal like protecting their magical community or solving a mystery that only their combined powers can handle.
He could gain the power of enhanced water control. The trident being a symbol of the sea god's power, Percy might be able to manipulate water on a much larger scale, like creating huge tidal waves or even controlling the water inside living beings.
He could gain the power of controlling water like Poseidon's kids since he has good chakra control. It would be a new addition to his skill set.
One possible power is the ability to see through illusions more easily. Since the Kyuubi is a powerful entity, a doujutsu from it could give Naruto an edge against genjutsu users. It could break through complex illusions that would otherwise trap him.
Naruto could gain enhanced senses from the Ghost Rider powers. In the Naruto world, this would help him in detecting hidden enemies or traps more easily. The ability to ride the flaming motorcycle would also be a new skill. This could be used for quick transportation during missions or battles. He could also gain the power of transformation into the Ghost Rider form, which not only gives him a more intimidating look but also access to all the other Ghost Rider abilities. And with the Ghost Rider's connection to the spirit world, Naruto might be able to communicate with spirits in the Naruto universe, which could lead to new plot developments.
In this fanfiction, Harry could gain the power of enhanced perception. This would allow him to see things that normal humans or even wizards can't, such as the flow of spiritual energy. He might also gain the power to transform into a more powerful form, like a Shinigami's Bankai. His existing magical powers could potentially merge with his new Shinigami powers, creating something entirely unique. For instance, he could use his Patronus charm in a new way within the Shinigami world, perhaps as a form of spiritual protection.