When writing a Tokyo Ghoul crossover fanfic, focus on character development. If it's a crossover with 'Fairy Tail', show how the Fairy Tail mages react to the existence of ghouls. Some might be scared, while others might be curious. Build a world where the two universes blend well. For example, in a city where Fairy Tail mages and ghouls co - exist, there could be new laws and power dynamics. And don't forget to add some emotional depth, like a ghoul falling in love with a human mage and the struggles that come with it.
First, do your research on both universes. Know the characters, their powers, and the settings well. For RWBY, understand the different academies, the concept of Dust, and the relationships between the main characters. For Tokyo Ghoul, learn about the CCG, the different types of ghouls, and the Anteiku coffee shop.
One popular crossover idea could be with 'Attack on Titan'. Picture Tokyo Ghoul characters in the world of Titans, fighting alongside or against the Survey Corps. Another could be with 'Fullmetal Alchemist', where the alchemical concepts might interact with the ghoul powers. For example, an alchemist trying to find a way to cure the ghouls or control their kagune.
Well, it could be about Jedi or Sith characters finding themselves in the Tokyo Ghoul universe. Maybe a Jedi has to use the Force to deal with the ghouls' kagune. They might try to bring peace between humans and ghouls, like they do in their own galaxy with different species.
The plot could involve the ghouls from Tokyo Ghoul being brought into the Avengers' world. Maybe the Avengers initially mistake the ghouls for new, dangerous threats. But as they learn more about the ghouls' situation, they might try to find a way to co - exist. For example, Kaneki could share his story with the Avengers, and they could be sympathetic. Then they could team up to fight a common enemy, like a new type of super - villain who wants to use the power of ghouls for evil purposes.
The plot might focus on the struggle for identity that both Kaneki and Shinichi face. Kaneki is caught between his human and ghoul sides, while Shinichi has to deal with having a parasite in him. In the crossover fanfic, they could exchange their experiences and learn from each other. They might also encounter a new type of being that combines the traits of ghouls and parasites, which forces them to re - evaluate their own identities and how they fit into this new world of the crossover.
One great Tokyo Ghoul Kaneki crossover fanfiction is the one where he crosses over with the world of 'Attack on Titan'. It's really interesting to see how Kaneki's ghoul abilities interact with the Titans. The author does a great job of creating a believable scenario where the two worlds collide.
The characters would interact in very interesting ways. For instance, Levi from Attack on Titan might be initially suspicious of the ghouls. But once he sees their combat abilities, he could try to recruit them or at least work with them. Kaneki, on the other hand, might be in awe of the Survey Corps' determination. He could learn a lot from their teamwork and discipline. And the ghouls' concept of a 'family' within Anteiku could be something that the soldiers of the Survey Corps might find strange but also endearing.
The Jedi would likely approach the ghouls with caution at first. They would try to understand their nature and see if there's a way to coexist. For example, Obi - Wan Kenobi might try to negotiate with the ghoul leaders. The Sith, on the other hand, might see the ghouls as potential minions or tools. Darth Maul could try to use the chaos of the Tokyo Ghoul world to his advantage.
Kaneki's kagune could be used in combination with Shinichi's parasite - enhanced physical abilities. For example, Kaneki could use his kagune to create a distraction while Shinichi uses his speed and strength to attack the enemy. Or they could work together in a more direct way, with Shinichi using his parasite - hand to hold an enemy in place while Kaneki delivers a powerful kagune strike.
One way the worlds could collide is through a magical accident. Maybe a spell in the Harry Potter universe goes wrong and opens a portal to the Tokyo Ghoul world. The wizards could be shocked to see the ghouls with their kagunes. And the ghouls would be equally surprised by the magic of the wizards.