Well, a lot of 'cat black butler fanfiction' has themes related to the supernatural. Since Black Butler already has a lot of supernatural elements, adding a cat with its own strange powers fits right in. There are also themes of friendship. The cat could form an unlikely friendship with a character in the story. Sometimes, there are themes of transformation too, where the cat might transform into something else, which adds an exciting element to the plot.
One common theme is mystery. The cat often brings an element of mystery to the story. Another is loyalty, as the cat might be fiercely loyal to a particular character.
Another theme is his past as a soldier. Fanfictions like to expand on his military experiences, like how he dealt with the trauma of war. It could be about him having nightmares and how he overcomes them while serving the Phantomhives.
One common theme is obedience. Since discipline often implies following rules or orders, many fanfictions explore how the characters in Black Butler, like the servants in the Phantomhive manor, learn to be obedient. For example, they might face consequences if they don't follow Sebastian's instructions.
Another theme is the power dynamics. Kagome has her spiritual powers, and in the Black Butler world, there are different power structures like the demons and the Phantomhive household. Fanfictions play around with how Kagome's powers interact with these existing power dynamics. They might show her as a force to be reckoned with or someone who has to learn to navigate within this new power structure. This can lead to some really interesting plot developments.
One common theme is the idea of forbidden love. Given the nature of the 'Black Butler' world with its hierarchies and secrets, many fanfictions explore relationships that are not supposed to happen. For example, a relationship between a servant and a noble.
One common theme is the exploration of Ronald's dual nature. He's a reaper, but he also has his own desires and emotions. Fanfictions often delve into how he balances his duties and his personal side.
One common theme is friendship. Finny's relationships with the other servants, like Sebastian and Mey - Rin, are often explored. Another theme is self - discovery. Finny is a character with a lot of potential, and many fanfictions focus on him finding out more about himself.
Character growth is also a common theme. Characters from both series are put in new situations. Naruto might have to adapt to the strict social hierarchies in the Black Butler world, and characters from Black Butler might learn from Naruto's values of friendship and determination. This allows for a lot of character development and makes the fanfictions more engaging as we see familiar characters evolving in new ways.
Another theme is mystery. Given her somewhat enigmatic character in the original 'Black Butler', fanfictions often play up on this aspect. They might explore her past, where she came from, or what her true motives are. This adds an air of intrigue to the stories. For instance, some fanfictions might suggest she has a hidden agenda that gradually unfolds throughout the story.
The spirit of giving is also a prevalent theme. In many 'Black Butler Christmas fanfiction', the characters exchange gifts in their own unique ways. Sebastian might give Ciel a gift that has a deeper meaning related to their master - servant relationship. And often, there's a sense of magic in the air. Christmas is a time when the normal rules of the 'Black Butler' world can be bent a little, with a touch of holiday magic making things possible that wouldn't be otherwise.
The dark and gothic atmosphere of the 'Black Butler' world is also a prevalent theme. Writers love to recreate and expand on the spooky and mysterious elements, like the supernatural occurrences and the Victorian - era setting.