One interesting plot could be their adventure in a foreign land. They might face various challenges together and their relationship deepens through it.
One great 'John Marlena Black Magic' fanfiction could be 'The Enchanted Bond'. It beautifully weaves the elements of black magic into their relationship. The author creates a world where Marlena discovers she has latent magical powers and John is unwittingly drawn into the magical chaos. It's a really engaging read.
Love and danger are key elements. The love between John and Marlena is put to the test in a world filled with black magic. There's also the mystery aspect, like trying to figure out the source of the black magic and how to stop it from ruining their relationship.
I haven't actually read this particular fanfic in full. But generally, in fanfics about John and Seraphina from 'unordinary', the relationship between the two characters can be explored in many interesting ways. Maybe this fanfic focuses on their friendship or a potential romantic relationship in a unique setting within the 'unordinary' universe.
Maybe John was frustrated at Sherlock's eccentric behavior. Sherlock often acts in ways that are outside of normal social norms, like his extreme focus on cases and disregard for basic social niceties. This could have led John to lash out and call him a 'freak' in a moment of exasperation.
There could be a fanfic where Pocket John discovers a hidden power within himself. In this story, he starts off as an ordinary character but then realizes he has the ability to communicate with animals, which leads to a whole series of interesting events as he tries to use this power for good in his community.
Character consistency is key. Even when John is in the bottom role, his core traits should remain. For example, if he's known for being brave, that should still show through. Also, the relationship dynamics are important. How he interacts with other characters, whether it's a romantic or platonic relationship, should be well - developed.
One common theme is friendship. Their relationship starts as a rather odd friendship between a brilliant detective and an ex - military doctor. Many fanfics explore how they grow to rely on each other more and more.
One common theme is friendship. Many fanfics focus on how Dirk and John become friends and how that friendship grows over time. They might start as just acquaintances in the story and then develop a really strong bond.