The 'Lost Soul' trope is also quite popular. The OC might be a lost soul, just like Ciel in some ways, and they find solace in each other. There's also the 'Time - Travel' trope in some Ciel Phantomhive x OC fanfictions, where the OC comes from a different time and has to adjust to the Victorian era while also dealing with Ciel and his world.
One popular trope is the 'Forbidden Love' trope. Since Ciel is in a rather dark and dangerous world, an OC falling in love with him can be seen as a forbidden thing. Another is the 'Mysterious Newcomer' trope, where the OC arrives at the Phantomhive estate with a hidden agenda or a secret past.
A common trope is also the 'Redemption' trope. The OC might try to redeem Ciel from his dark path or his deal with Sebastian. And then there's the 'Powerful Ally' trope. The OC could be a powerful character, like a witch or a demon hunter, who becomes an ally to Ciel in his fight against his enemies.
Well, Ciel Phantomhive x OC fanfiction can be really interesting. OCs (Original Characters) in such fanfictions often bring new dynamics to the story. They can either be a love interest for Ciel, or a character that changes the course of the plot in the 'Black Butler' universe. For example, an OC could be a new servant in the Phantomhive household, with a mysterious past that ties in with Ciel's mission against the underworld.
Once upon a time, there was a girl (the OC). She met Ciel Phantomhive at a grand ball. Ciel was initially cold towards her but was intrigued by her unique charm. As time passed, they often crossed paths during various social events. The OC showed kindness to Ciel, different from others who were after his wealth or status. Ciel started to open up to her, and they shared secrets. Eventually, love blossomed between them, and they faced the challenges of Ciel's dark past and the high - society drama together.
One popular trope is the 'Forbidden Love' aspect. Since Sebastian is a demon and Ciel is a human, their relationship can be seen as something that goes against the natural order. Another is the 'Power Struggle' trope. Ciel may try to assert his authority over Sebastian, but Sebastian's demonic nature gives him an edge in certain situations. 'Soul Bond' is also common. Given their contract and the connection it implies, fanfictions often explore the deeper spiritual and emotional bond that might develop between them.
One key element is the contrast between Ciel's cold and calculating nature and the OC's unique qualities, which could be kindness or creativity. Another is the setting of the Victorian era, with all its social norms and hierarchies that they have to navigate. Also, Ciel's past traumas play a role as the OC has to understand and help him overcome them.
One great Ciel Phantomhive x Sebastian fanfiction is 'The Contract's Unforeseen Path'. It delves deep into the complex relationship between Ciel and Sebastian. The story shows how their bond evolves beyond the typical master - servant dynamic. It has some really interesting plot twists that keep you hooked from start to finish.
A common trope is the 'fish - out - of - water' situation. The OC, being from a normal world, is completely out of their element when dealing with Slenderman and his spooky realm. Another popular trope is the 'damsel in distress' or 'heroic OC' dichotomy. Sometimes the OC is portrayed as a helpless victim that Slenderman preys upon, while other times they are the brave hero who tries to fight back or outwit him.
One popular trope is the 'fish out of water' for Sebastian. As he is from a different era or world in a sense, seeing him adjust to modern technology like smartphones and the internet can be really interesting. For example, he might be confused by social media but quickly learn to use it to protect Ciel.
One popular trope is the 'enemies to lovers' situation. The OC starts off seeing Yami Bakura as a threat but gradually falls for his mysterious charm. Another trope is the 'chosen one' trope where the OC has some special power or destiny that is intertwined with Yami Bakura's. Also, the 'soulmate' trope can be found, where they are fated to be together in some way.
The 'fish out of water' trope is also seen in these fanfictions. For example, if the OC is from a small town and suddenly gets thrown into Brendon Urie's world of fame and big cities. This creates a lot of humorous and interesting situations as the OC tries to adapt. These tropes are popular because they add drama, humor, or a sense of the extraordinary to the stories, making them more engaging for readers.
A common trope is the 'Forbidden Love' angle. Since Klaus is a complex and often dangerous character, a relationship with an OC can be seen as something that goes against the norms of the vampire world. Another popular trope is the 'Soulmate' concept, where the OC is fated to be with Klaus, and their connection is so strong that it defies all odds.