One possible fanfic could be about Mika and Krul forming an unexpected alliance. Maybe they have to work together to face a common enemy that threatens both of their existences. In this story, Mika might start to see Krul in a different light, not just as a vampire but as someone with her own motives and desires.
Another theme is friendship. OCs often form strong bonds with the existing characters. For example, they might team up with Yuuichiro and the others to fight against the common enemy. This theme helps to integrate the OC into the story world.
One idea could be a 'what if' scenario where the main characters have different abilities from the start. For example, Yuichiro could have a hidden power related to healing instead of his usual combat skills. This would change the whole dynamic of his relationships and the battles they face.
One aspect to consider in such a fanfic is the relationship dynamic. Crowley is a complex character in Owari no Seraph. When paired with a reader - insert, it can lead to interesting interactions. For example, his loyalty to his own kind might be challenged by his feelings for the reader. This could create internal conflict within him, making for a captivating story line.
One great 'owari no seraph mika x yuu fanfic' is 'Fragments of a Bond'. It beautifully explores their relationship in a post - apocalyptic setting, delving deep into their unspoken emotions. The writing style is engaging and really draws you into their world.
First, you should re - watch or re - read the series to really understand the characters and the world. Then, pick a concept or idea that interests you, like I mentioned before. After that, just start writing. Don't worry too much about grammar or making it perfect at first.
In Owari no Seraph fanfic, Ferid and Mika often have a complex relationship. Ferid is a rather mysterious and powerful character. Mika, on the other hand, has his own goals and a strong will. Their interactions can range from being antagonistic to having an odd sort of understanding. Sometimes, Ferid might see Mika as an interesting pawn in his grand schemes, while Mika may view Ferid with suspicion and wariness due to Ferid's unpredictable nature.
One popular theme is the power dynamic between them. Ferid is a powerful vampire and Mika is a vampire - like being with his own set of abilities. Their clashes in terms of power can make for interesting stories. Another theme is the mystery aspect. Ferid has a lot of secrets, and Mika may be in a position to uncover some of them, which creates a sense of intrigue.