Duty is a big theme too. They have their duties in the Black Butler world, and fanfictions often play with how they balance their personal feelings with their duties. There's also the theme of mystery. Given the nature of the Black Butler universe, many fanfictions add more mystery to their characters, like uncovering secrets about their families or pasts that add more depth to their relationship.
Friendship is often a common theme. The stories might explore how Eric and Alan's relationship develops from being just acquaintances to really close friends. Maybe they go through some challenges together that strengthen their bond.
Another theme could be self - discovery. As they interact, both Alan and Eric learn more about themselves, their strengths, and their weaknesses. This can be really interesting as it adds depth to their characters in the fanfiction.
There are quite a few out there. 'The Trials of Eric and Alan' is a fanfiction that throws them into difficult situations and shows how they overcome them together. It's full of action and drama. Additionally, 'Eric and Alan: The Forgotten Chapters' uncovers some parts of their story that might not be as well - known, adding new layers to their characters.
One common theme could be friendship. Their relationship might be explored in terms of how they support each other through different challenges. Another theme could be adventure, where they go on some exciting journey together.
Love is a very likely theme. In many fanfictions, the relationship between the two characters can evolve into a romantic one. This could be a slow - burn type of love where they start off as adversaries but gradually fall for each other. Additionally, themes of loyalty might be present. They might have to show loyalty to each other in the face of difficulties or against other characters in the reaper world.
One common theme might be the power dynamic. Since it involves a bully aspect, there could be a play on who has the power in the relationship between Eric and Alan. Another could be redemption. Maybe the bully (whichever character that might be) has a change of heart over time.
One common theme is redemption. Since Eric had a rather villainous role in the movie, many fanfictions explore his path to redemption, whether it's through self - reflection or the influence of other characters.
The theme of redemption is also quite common. Since Grell has done some rather dark things in the 'Black Butler' series, many fanfictions explore whether he can find redemption. Some stories show him trying to make amends for his past actions, either through helping others or by changing his ways. And of course, the theme of friendship or camaraderie among the reapers, especially with Grell, is often explored. We see how he interacts with other reapers and how those relationships develop or deteriorate in different fanfictions.
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.
One common theme is the idea of rebirth or transformation into a baby form. This often leads to a change in the power dynamics between characters. For instance, a powerful character like Ciel becoming a baby makes him vulnerable, and other characters have to step up to protect him.