For Yuuri, he may become more assertive in the Black Butler world. He has to adapt to survive, so his shyness might take a backseat. Sebastian would still be his composed, devilish self, but he could develop a newfound respect for Yuuri's tenacity. Ciel, whose main goal is often revenge, might be distracted by Yuuri's presence. His personality could shift from being so single - minded to being more conflicted. Yuuri's focus on his art and self - improvement could make Ciel re - evaluate his own life's purpose, and he may start to wonder if there are other paths he could take besides revenge.
One idea could be that Yuuri Katsuki, being a world - class figure skater, is invited to perform at an event in the Victorian - era setting of Black Butler. Sebastian could be tasked with making sure the event runs smoothly and he's both intrigued and somewhat amused by Yuuri's unique form of art. Ciel, on the other hand, might initially be dismissive but then becomes interested in the grace and athleticism Yuuri shows on the ice.
It could lead to some self - awareness. Yuri might become more confident if he reads fanfictions that focus on his growth. Viktor could get new ideas for his coaching. Overall, it might strengthen their relationships as they see how fans view their bond.
It could be quite an interesting experience. They might be surprised at the different interpretations of their relationships and stories. For example, Viktor might be amused by how some fanfictions exaggerate his charm. Yuri could be either flattered or a bit embarrassed by how his insecurities are explored in some fictions.
Kagome's spiritual arrows could be enhanced by Grell's death scythe in a strange way. Maybe their combined powers could create a new weapon or a powerful blast that could defeat a very strong foe. Also, Shippo's illusions could be used to deceive the enemies, and Bardroy's explosives could be set off at the right moment to create chaos among the enemy ranks, which would give Inuyasha and the Black Butler characters an advantage in battle.
Sebastian's superhuman strength, speed, and demonic powers would be a huge asset in Gotham. He could easily take on many of the thugs and villains. Batman, on the other hand, with his detective skills and gadgets, would be very intrigued by Sebastian. Alfred's combat and medical skills might be similar to some of the skills in the Black Butler world. Ciel's intelligence and strategic thinking could also be useful in Gotham's complex criminal underworld.
The characters would have some really interesting interactions. For example, Sebastian would likely be polite yet calculating when dealing with the Sohma family. He might see them as an interesting study, especially those with the animal curse. Tohru, being her kind self, would probably try to befriend Ciel and the others. However, Ciel might be initially suspicious of her overly - nice demeanor, as he's used to a world full of deception.
When it comes to translating the personalities of 'Black Butler' characters to cats in fanfiction, it's quite interesting. Take Sebastian for instance. His demonic charm and self - assuredness would make him a cat that other cats are both in awe of and a bit scared of. He would have a certain allure. Ciel's dark past and his need for revenge would make him a brooding cat, often sitting alone and plotting. Grell's love for the macabre would make him a cat that's interested in strange things, like chasing after dark - colored insects or exploring spooky corners. And Bardroy's laid - back nature would be a cat that enjoys lounging in the sun and not getting too worked up about things.
The interactions would also depend on the setting of the crossover. If it's set in the world of Black Butler, the Soul Eater characters would have to adapt to the Victorian - era society. Maka, for instance, might be frustrated by the strict social norms while trying to hunt for kishin eggs. The Black Butler characters would be in charge and would likely view the Soul Eater characters as outsiders at first. However, as they work together against common threats, they would start to understand and respect each other. If it's set in Soul Eater's Death City, the Black Butler characters would be in a more modern and chaotic environment, which would be a big change for them.
The Akumas in D Gray - Man are created by the Millennium Earl. If Akumas were to enter the Black Butler world, they would be a major threat. Their ability to transform and their inhuman strength would be a challenge for the Black Butler characters. On the other hand, Sebastian's demonic powers and his ability to make contracts could potentially be used to manipulate or destroy the Akumas. The D Gray - Man exorcists are trained to fight Akumas specifically, so their skills would be very useful in this new setting. But the Black Butler characters' knowledge of the local environment and their own unique skills, like Mey - Rin's sharpshooting and Bardroy's combat experience, could also contribute to the fight against the Akumas in ways the D Gray - Man exorcists might not expect.
The demons in 'Black Butler' would have to be more discreet in the real world. So, Sebastian's actions would be more low - key. And Ciel's revenge plot might be more about using legal means rather than the more extreme measures in the original story.