The magic system could be used to both combat and understand the ghouls. Spells like Legilimency could be used to read the minds of ghouls to find out their intentions. And defensive spells like Protego could be crucial when facing a ghoul's attack.
The magic system in Harry Potter could have a huge impact in a crossover fanfiction. Wizards could use magic to create barriers around areas to keep ghouls out. Transfiguration spells could be used to transform objects into weapons against ghouls. However, the ghouls' unique physiology might also pose challenges to the magic. For example, their kagune might be able to break through some magic barriers. This would lead to a constant evolution of the use of magic in the story, as the wizards try to find new ways to use their spells and abilities against the ghouls.
In such a fanfiction, the magic system would likely be adapted. For instance, the Unforgivable Curses might have different implications when used against ghouls. The Killing Curse might not work as effectively on ghouls as they are not exactly 'human' in the same sense. Also, potions could play a role. A potion might be created to either repel ghouls or to disguise a wizard as a ghoul to infiltrate their society.
The characters would interact in very unique ways. For example, Harry Potter might be initially cautious around the ghouls from Tokyo Ghoul. He's used to dealing with Voldemort and his Death Eaters, but ghouls are a completely different type of threat. Ken Kaneki, being a half - ghoul, could teach the wizards about the nature of ghouls, and in return, the wizards could show him some amazing magic spells.
Well, when it comes to the magic system of Harry Potter in Yharnam in a fanfiction, it's a complex scenario. Consider the Unforgivable Curses. In Yharnam, the Imperius Curse might not work as smoothly on the minds of the people or creatures there, as they might have a different mental resistance due to the constant exposure to horror. The Cruciatus Curse could have unforeseen effects on the already tortured souls of Yharnam. As for the magic in general, the wand - less magic that some advanced wizards can do might be more necessary in Yharnam, as the chaos and quick - paced battles might not always allow for the time to draw a wand. Also, the Hogwarts houses' traits could influence how wizards interact with Yharnam. Gryffindors might be more likely to charge into danger, while Hufflepuffs might be more focused on helping the afflicted people of Yharnam.
Well, in this fanfiction context, the magic system could interact with the Green Lantern's power in various ways. Magic could be used to repair a damaged power ring. Since the rings are powered by willpower, a wizard's strong will, enhanced by their magic, could create even more powerful constructs. Also, the magical creatures in Harry Potter, like dragons, could be a new element in the Green Lantern's universe. The Green Lanterns would have to deal with them using their rings and knowledge of the magic system.
The storyline could be really interesting. Maybe the ghouls could be a new kind of dark creature in the Harry Potter world. The characters from Tokyo Ghoul, like Ken Kaneki, might attend Hogwarts. He could struggle with his ghoul nature while trying to fit in with the wizards and witches. The magic in the Harry Potter universe could also have an impact on the ghouls' abilities, perhaps suppressing or enhancing them.
One idea could be a crossover where a character from Harry Potter accidentally enters the world of Tokyo Ghoul. Medusa could be incorporated as a dark force or an ancient evil that has somehow influenced both worlds. Maybe she has the power to turn ghouls into stone, which throws the already complex ecosystem of Tokyo Ghoul into chaos. And in the Harry Potter side, her presence could be related to dark magic spells that are long forgotten.
One idea could be a crossover where a vampire from the Harry Potter universe somehow ends up in the world of Tokyo Ghoul. Maybe a vampire who was hiding in the Forbidden Forest gets transported to Tokyo and has to adapt to the new rules of the Tokyo Ghoul world, dealing with ghouls and the CCG. This could lead to some interesting power dynamics as the vampire's magic might be a new factor in the Tokyo Ghoul ecosystem.
The magic system could be affected by the radiation in the Fallout world. Spells might have different effects or require more effort to cast. For example, the Patronus charm could be harder to conjure due to the gloomy and desolate nature of the Fallout setting.
The themes could be blended by having a common enemy in the form of Medusa. In Harry Potter, there are dark forces that the characters fight against, and in Tokyo Ghoul, there are the conflicts between ghouls and humans. Medusa could be the overarching threat that unites both worlds. Her power to turn things to stone could be a metaphor for the rigidity and destruction in both worlds. For example, in Tokyo Ghoul, the constant struggle between the two species is causing a kind of'stagnation' in society, similar to being turned to stone.
Magic in the RWBY universe could be seen as a new form of energy. Spells like Lumos could be used to light up the dark areas filled with Grimm. Wizards might have to adapt their magic to work with Dust. For instance, a Fire - making spell could be combined with Fire Dust to create a more powerful blast.
The magic in Harry Potter is very diverse. In the Iron Throne setting, it could be used for various things. Spells like 'Accio' could be used to retrieve valuable items like swords or crowns from afar. 'Wingardium Leviosa' could be used in battles to disarm opponents or move large objects like catapults. However, the use of magic would probably be seen as a huge threat by many in the Iron Throne world who are used to more traditional forms of combat and power - seeking.