Common themes include the clash of different cultures. Harry's world of Hogwarts with its magic, classes, and houses is very different from Ciel's Victorian - era world full of mystery and danger. Authors often explore how these two worlds collide and what that means for the characters. Additionally, trust is a theme, as they need to learn to trust each other despite their differences.
One common theme is identity. Since they are from different universes, exploring how Harry and Ciel adapt to each other's worlds and how it affects their sense of self. Another could be friendship or rivalry, depending on how the author writes their relationship.
One common theme is the clash of different cultures. Ciel comes from a Victorian - era world with its own set of rules and values, while Harry Potter's world is full of magic and wizards. Another theme could be the exploration of power. Ciel has his own power dynamics in his world, and in the wizarding world, there are different levels of magical power.
One common theme could be identity. Since there are two Ciels, the question of who is the 'true' Ciel might be explored. Another theme could be family, as they are brothers and their family history and relationships play a role.
Love and romance are also common. Sometimes the Ciel OC falls in love with one of the existing characters, like Ciel himself or another member of the Phantomhive household. This can lead to all sorts of interesting relationship - based storylines, with the added twist of the OC's unique personality and backstory.
One common theme is identity. Since Ciel is female in these fanfictions, she often has to grapple with how she is perceived in a male - dominated society like the Victorian era. Another theme is relationships. Her relationships with Sebastian and other characters are re - imagined in different ways.
Another theme is the alteration of relationships. If Ciel is a girl, her relationships with characters like Sebastian or other nobles will be different. For example, a romantic relationship with Sebastian might be more complex or taboo due to the gender change. Also, her friendships might change as other characters might view her differently. In some fanfictions, she might form closer bonds with female characters as a result of being a girl herself.
In some ciel x lizzy fanfictions, there is a theme of self - discovery. As they interact more, they learn more about themselves. Ciel might discover a softer side of himself because of Lizzy, and Lizzy might find more strength in herself. Also, the theme of loyalty often comes up, as they prove their loyalty to each other in different situations in the stories.
Love and devotion are very common themes. Most fanfictions focus on how deeply Elizabeth loves Ciel and vice versa, despite all the difficulties they face.
One common theme is protection. Since Ciel is a baby in these fictions, Sebastian often takes on the role of a very protective figure, shielding Ciel from various threats.
Well, a frequent theme is the exploration of Ciel's femininity. It might be about how she balances her female identity with her role as the head of the Phantomhive family. Also, there's often the theme of how other characters perceive her differently as a girl, which can lead to new storylines and conflicts.
A theme that frequently shows up is the role of femininity in the Victorian - era setting. How fem Ciel navigates society's expectations while being in a contract with Sebastian. It also often involves themes of protection. Sebastian, as a powerful demon, may have different ways of protecting fem Ciel compared to the male Ciel in the original story. This can lead to some interesting plot developments and character interactions.