A third idea could be a time - travel crossover. Kaneki travels back in time and discovers that the origin of the centipede is somehow linked to the creation of ghouls. He has to work with a group of early - era ghouls and a centipede - like creature to change the course of history and prevent the future atrocities that are to come.
One idea could be to have Kaneki enter a parallel universe where he has to team up with a powerful centipede - like being to fight a common enemy. Maybe they are both trying to stop an evil organization that is experimenting on ghouls and creating mutant centipedes.
Well, you could have a centipede crossover with a superhero story. The centipede could gain superpowers, like the ability to scale buildings quickly with its many legs or spit out some kind of sticky substance to immobilize villains. Or it could be a centipede from an alien planet in a science - fiction crossover. It might have a different biology compared to Earth centipedes and interact with the human characters in strange ways. Also, consider a centipede in a historical fanfiction. For instance, in a medieval setting, it could be seen as a symbol of bad omen or a creature that has some sort of hidden knowledge.
A crossover with "The Avengers" would also be cool. Kaneki could team up with the Avengers to fight against a common enemy that threatens both the human and ghoul worlds. His unique abilities would add an interesting element to the superhero team.
One idea could be an evil Kaneki crossover with the world of 'Attack on Titan'. Kaneki's unique kagune abilities could be a new form of weapon against the Titans. He might start off as an experiment by the Marleyans similar to how he was experimented on in the original Tokyo Ghoul story. Another idea is a crossover with 'Fullmetal Alchemist'. Here, Kaneki's struggle with his inner ghoul side could be paralleled with the Elric brothers' search for the Philosopher's Stone to regain their bodies. He could be seen as a new type of chimera in this world.
One idea could be a crossover with the world of 'Fullmetal Alchemist'. Kaneki Ken could be a chimera created by some dark alchemical experiment. His kagune could be seen as a strange alchemical creation. Another could be a crossover with 'Attack on Titan', where Kaneki joins the Survey Corps and uses his kagune to fight Titans in a unique way.
First, do some research on both Kaneki from 'Tokyo Ghoul' and the concept of the centipede in relevant works. This will help you understand their characteristics better. Then, come up with a basic plot idea like how they meet. For example, Kaneki could be exploring an abandoned lab and stumble upon a centipede that has some strange powers.
Well, in such a fanfiction, one interesting idea could be how Kaneki's character traits change when presented as a girl. Maybe she'd have a different approach to relationships, like being more empathetic in a different way compared to when she was male. Also, her appearance as a girl might lead to new interactions with other characters in the story.
One idea could be to focus on a centipede's journey through an enchanted forest. It could encounter various magical creatures and have to overcome different obstacles using its many legs to climb and traverse difficult terrains.
Well, in 'kaneki crossover death note fanfiction', a possible concept is the way their different worlds collide. Kaneki comes from a world full of ghouls and the CCG, and Light is in a world where he's using the Death Note to change society. If they were to meet, it could lead to some really intense power struggles. Also, the idea of how their respective allies and enemies would react to the crossover is quite fascinating. Kaneki's friends from Anteiku might be completely bewildered by the Death Note, and Light's accomplices might see Kaneki as a new threat or a potential tool.
One idea could be a crossover with the 'Harry Potter' universe. Ken Kaneki could be a new student at Hogwarts, dealing with his ghoul powers while also learning magic. Another could be a crossover with 'Attack on Titan', where he helps the Scouts fight Titans, using his unique abilities. Or perhaps a crossover with 'My Hero Academia', where he attends UA and has to navigate the world of heroes and villains.
One interesting idea could be a crossover with "Moana". Elsa's ice powers and Moana's connection to the ocean could create a really cool dynamic. Maybe Elsa accidentally freezes part of Moana's ocean and they have to work together to fix it. Another could be with "Tangled". Rapunzel's long hair and her adventurous spirit combined with Elsa and Anna's journey in Frozen 2 would be exciting. Rapunzel could use her hair to help them climb mountains or cross chasms. A third idea is a crossover with "Beauty and the Beast". Belle's love for books and knowledge could help Elsa understand more about her powers and the history of magic in the Frozen world.