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 loyalty are common themes. Often, these fanfics explore how Lizzy's love for Ciel endures despite his dark secrets. Another theme is growth. Ciel may grow as a person because of Lizzy's influence, and vice versa.
Adventure could also be a theme. Writers might put Ciel and Lizzy in various adventurous situations where they have to rely on each other and their relationship deepens as a result. For example, they could be on a quest together to solve a mystery or defeat an enemy. This not only adds excitement to the story but also gives more depth to their relationship.
Romance can be a theme as well. Some fanfiction writers explore the possibility of a romantic relationship between Hop and Lizzy. They might start with a slow - burn relationship, with lots of shy glances and small moments of connection that gradually build into something more. This can add a whole new layer of depth and emotion to the fanfiction, as readers get to see the characters in a more intimate and loving context.
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.
There's a fanfiction titled 'Unlikely Bonds' which delves into how Ciel and Lizzy Lemon, coming from different worlds, gradually form a relationship. It shows their journey of understanding each other's personalities and pasts in great detail. In this story, they face many challenges together which ultimately strengthen their bond. It's a really engaging read as it combines elements of adventure and romance.
The theme of mystery also crops up a lot. Since the Black Butler universe has a lot of mystery already, fanfictions might add more. For instance, there could be a mystery surrounding Lizzy's family and how it ties into Ciel's past. This makes the readers keep reading to find out the truth.
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 the idea of the OC being a source of change for Ciel. Since Ciel has a rather dark and set - in - his - ways personality, the OC often comes in and shakes things up, like bringing more light into his life.
Ciel would likely become more protective. He has always been in a dangerous world, and now with a baby on the way, he'll do whatever it takes to safeguard his family. Lizzy, she might become more nurturing. She was already a strong character, but motherhood could bring out a softer, more patient side of her.
Some ciel x lizzy fanfictions focus on their relationship development in different scenarios. For example, there might be stories set in alternate universes where they meet under different circumstances. You could also try looking on Fanfiction.net, although the selection might be a bit more varied in terms of quality compared to Archive of Our Own.