Family or surrogate family is also a theme. Given Ciel's tragic family situation in the original, fanfictions may introduce new characters or develop existing relationships in a way that gives baby Ciel a sense of family. For instance, some stories might have the servants of the manor taking on more parental roles towards the baby Ciel, creating a warm and loving environment for him to grow in.
In this fanfic, Ciel's fear of the dark might be a manifestation of his past traumas. He has endured so much at a young age, and the dark could symbolize the unknown and the things he fears from his past, like the abuse and the loss he has faced.
A fanfic could show a moment where Ciel is at his most vulnerable, and Lizzy is the only one there to comfort him. Perhaps after a particularly difficult encounter with a foe, Lizzy finds Ciel in his study, and she simply holds him without saying a word, which means a great deal to Ciel.
A fanfic might explore their relationship in a different time period. For example, what if they were children again? They could have innocent playdates that gradually reveal their deep - seated feelings for each other. Ciel might be less guarded around young Lizzy, and she could bring out his softer side.
One popular 'Black Butler Female Ciel Fanfic' is 'The Lady Phantomhive'. It gives a really interesting take on how a female Ciel would handle the various situations in the Black Butler universe. Another great one could be 'Female Ciel's Ascent' which focuses on her growth and development in a unique way compared to the original male Ciel in the series.
One possible fanfic could focus on Ciel having an asthma attack during a crucial moment, like in the middle of a negotiation with a powerful adversary. His butler, Sebastian, would then have to quickly find a way to help him while also maintaining their cover. Maybe Sebastian uses his demon powers discreetly to ease Ciel's breathing.
Another great one is 'Baby Ciel's Adventures'. This fanfiction takes baby Ciel on various adventures around the manor and the surrounding areas. It's filled with cute and endearing moments as Ciel discovers the world around him, with his innocence and naivete being a central theme throughout the story.
A possible plot could be that Ciel is poisoned. It could be a slow - acting poison that he unknowingly ingests during a dinner party. As he slowly succumbs to the poison, Sebastian tries everything he can to save him but fails. His death then causes chaos in the underworld as his position as the head of the Phantomhive family is left vacant, and many vultures start circling around to take advantage of the situation.
One common theme is the power imbalance. Sebastian is a powerful demon, and Ciel is a young, mortal master. This creates a lot of tension and interesting situations where Ciel is constantly trying to hold his own against Sebastian. Another theme is loyalty and its limits. Sebastian is bound by a contract, but his true motives are often questioned.
The mystery surrounding Ciel in 'Black Butler R Ciel Fanfic' is a big draw. His complex personality and the secrets he holds make for great storytelling. Writers can explore different aspects of his character, like his hidden desires and fears.