One common theme is friendship. Given the complex relationships between the characters in the original, fanfictions often explore and expand on the bonds of friendship among them.
Character development is also a big theme. Since the D Gray - Man world is complex, in the gamer fanfiction, we often see characters evolving as they face different challenges. For instance, Kanda's relationship with others might change as he progresses through his 'game - like' experiences. And teamwork is important too. Characters team up to achieve goals, much like in a multiplayer game.
There are themes like identity. Allen has a unique identity as an exorcist and as someone with a special connection to the Innocence. Fanfictions often explore how this identity affects his decisions and relationships. Additionally, the theme of good versus evil is also common, with Allen being right in the middle of this battle in the D.Gray - Man universe.
One common theme is the origin of the Noah and their connection to the Mother. Many fanfictions explore how the Noah came to be and what role the Mother played in their creation. Another theme is power. The Noah Mother is often depicted as a very powerful entity, and fanfictions may explore how this power is passed down to the Noah or how it affects the world around them.
Another theme is the exploration of the complex relationships within the Black Order. In these fanfictions, the reader often has to navigate the different personalities and power dynamics among the exorcists. It can be a really interesting exploration of loyalty, friendship, and sometimes even romance.
Another theme is the relationship between characters. Whether it's the complex relationship between the Exorcists in D Gray - Man or the master - servant dynamic in Black Butler, fanfictions love to play around with these relationships. They might create romantic pairings that are not in the original series or explore the deeper bonds between characters in different situations. For example, a fanfiction could explore what would happen if a character from D Gray - Man had to serve as a butler in the Black Butler world. This would completely change the power dynamics and create a whole new set of interactions.
One common theme is friendship. Allen and Lenalee's friendship is a central part of many fanfictions. Their loyalty to each other and how they support one another through difficult times is often explored.
A common theme is the adaptation of the characters' original powers and purposes into a high school context. So, the exorcist powers might be seen as special talents in school.
A common theme is friendship. Their friendship is often explored more deeply, like how they support each other through tough times in the Order.
Redemption is also a prevalent theme. Many OCs in fanfics have made mistakes in their pasts. They then strive to make up for those mistakes while fighting against the forces of evil in the D.Gray - Man universe. This adds depth to their characters and the overall story.
Adventure is also a frequent theme. Given the nature of the D Gray - Man world, fanfics may send Yuu and Lavi on new and exciting adventures together, facing new enemies and challenges.