Another theme is the idea of power dynamics. Since Sebastian is usually a very powerful character, how Allen relates to that power, whether he challenges it or succumbs to it, is often explored. Also, themes of loyalty and betrayal can be found. For instance, in some fanfictions, there are situations where one has to choose between their loyalty to their original side and their new - found bond with the other.
The theme of redemption also shows up a lot. Given their complex backstories, fanfiction writers often explore how they can find redemption through their relationship with each other. Additionally, the theme of mystery is common as both characters have secrets, and the process of uncovering those secrets in relation to their relationship is an interesting aspect in many 'allen x sebastian fanfiction' works.
One common theme is the exploration of their opposing natures. Allen is often portrayed as more pure - hearted and Sebastian as more devious, so the clash and possible reconciliation of these traits is a big theme. For example, in many fics, they start off as enemies but gradually come to understand each other.
In sebastian x grell fanfiction, a frequent theme is power dynamics. Sebastian is a powerful demon and Grell, though not as powerful in the same way, has his own kind of strength. How they interact in terms of power, who dominates and who submits at times, is often explored. Another theme is the idea of fate. Whether they are fated to be together or are constantly fighting against their fated roles in their own worlds.
A common theme is rivalry. Since they are often at odds in the original source material, this is carried over into many fanfictions. They compete for power, influence, or the attention of a certain character.
Adventure is also a common theme. They might go on a quest together, facing various obstacles which strengthen their bond. For example, in many fanfictions, they have to battle magical creatures or solve mysteries. During these adventures, their relationship evolves. Another theme is self - discovery. Through their relationship with each other, both Sebastian and Lyra often learn more about themselves, their strengths and weaknesses, and what they truly want in life.
One common theme is friendship. They might be depicted as having a deep and unbreakable bond. Another could be adventure, like they embark on some exciting quests together.
A lot of Grell x Sebastian fanfictions have the theme of redemption. Maybe Sebastian finding a way to be redeemed through his relationship with Grell or vice versa. Also, the theme of sacrifice can be found. For example, one of them might have to sacrifice something important for the sake of their relationship. And there's also the theme of mystery, as their relationship is full of unknowns and secrets.
Another theme is self - discovery. In many fanfictions, Kurt and Sebastian help each other grow as individuals. For example, Kurt might help Sebastian become more empathetic, while Sebastian could encourage Kurt to be more assertive.
A common theme is the struggle between their different personalities. Kanda is often more brash and hot - tempered while Allen is more gentle yet determined. Their relationship development in the face of these differences is a big theme. For instance, how they learn to understand and accept each other.
One common theme is friendship. They often start as friends and then the relationship may develop further. Another theme could be adventure, where they embark on exciting journeys together.
One common theme is the exploration of their shared destiny. Since both characters have complex fates in the original story, fanfictions often play around with how their paths are intertwined.
A third common theme is the exploration of their pasts. Maybe there are secrets from their pasts that are gradually revealed, and these revelations affect their relationship. For instance, something from Cross's past might impact how Allen views him, or vice versa. This can add depth to their characters and the story as a whole.