In many 'Anderson x Heinkel fanfic', a prevalent theme is the exploration of their different personalities. Anderson might be more reserved while Heinkel is more outgoing, and the fanfic could delve into how they complement each other. There could also be themes related to family or heritage, especially if their backgrounds play a role in the story. For example, if they come from different families or cultures, how that affects their relationship can be an interesting theme to explore.
Often, there are themes of self - discovery. In the fanfics, Anderson and Heinkel might learn more about themselves through their interactions with each other. And of course, there could be a theme of loyalty. They might show loyalty to each other in different situations, like when facing challenges or enemies.
There are some fanfics out there that might be interesting. You could start by looking on popular fanfic websites like Archive of Our Own. Just search for 'Anderson x Heinkel' and you might find some great stories that explore their relationship in different ways.
There are also fics that focus on the idea of redemption. Given Anderson's religious beliefs, he might see it as his mission to redeem Seras from her vampiric state. This theme allows for deep exploration of moral and ethical questions within the context of their relationship. It can also lead to some very emotional and thought - provoking storylines as the two characters navigate these complex issues together.
A common theme is the battle of ideologies. Anderson, being a devout Catholic and Alucard, a vampire, they have very different outlooks on life and death. Fanfictions often explore how these clashing beliefs interact when they face each other.
The theme of self - worth also comes up a lot. Anderson's actions towards Sherlock can be seen as his way of trying to boost his own self - worth. He feels overshadowed by Sherlock and so he resorts to actions that might bring Sherlock down, as seen in 'The Search for Significance' where Anderson's every move against Sherlock is related to his own internal battle with his self - image.
Friendship is a common theme. Alexander and Anderson Blacklaggon are often depicted as having a strong bond. They support each other, have each other's backs, and their friendship might be tested but always endures.
One common theme is the exploration of Anderson's past. Many fanfics try to dig deeper into his backstory, like his upbringing and how he became a member of the Iscariot Organization.
One common theme is power struggle. Kai is a character associated with power, and when an oc is introduced, there's often a battle for dominance or influence. Another theme is the exploration of abnormal psychology. Kai has a very distinct and often disturbing psychological makeup, and the oc can serve as a contrast or a catalyst for further exploration of his mind.
Another theme could be adventure. Maybe they embark on a journey together, facing challenges and relying on each other's skills. For example, in a fantasy - based fanfiction, they could be on a quest to save their world from an evil force.
Love and friendship are likely to be common themes. Since it's a fanfiction about two characters, the development of their relationship, whether it's a romantic love or a deep friendship, could be a central focus.
One common theme is the exploration of their dark and complex relationship. Since both characters have deep psychological aspects, these fanfics often dig into how they interact on that level.