Their relationship could be characterized as a clash of the old and the new. Lucifer represents the ancient, rebellious celestial being, while Adam is the new creation. It could be a relationship full of tension as they come from such different worlds.
One interesting plot idea could be that Lucifer, seeing Adam's pure and innocent nature, decides to test him in various ways. He might create illusions of worldly temptations to see if Adam can resist. Another could be that Adam, being curious about the fallen angel, tries to understand Lucifer's fall from grace and in the process, they form an unlikely friendship that challenges the norms of heaven and earth.
In the 'Hazbin Hotel' fanfiction, the relationship between Lucifer and Adam could develop in many ways. Adam could be initially afraid of Lucifer, but as he spends more time in Hell and gets to know Lucifer better, he realizes that Lucifer has his own complex emotions. Lucifer, on the other hand, might be used to being feared but Adam's different reaction, like showing pity or trying to understand him, could make him more receptive to Adam. They could also be brought together by a common enemy or a shared goal, like trying to improve the conditions in a certain part of Hell. As they work towards this goal, their relationship would grow from suspicion to trust and perhaps something more than just friendship over time.
One plot idea could be Lucifer seeing a different side of Adam that no one else has. Maybe Adam shows kindness towards a lower - class demon, which makes Lucifer question his own views. Another could be that they team up to solve a mystery in Hell that threatens both the sinners and the native demons. And a third idea is that Adam tries to introduce Lucifer to more 'human' concepts like forgiveness, which Lucifer initially resists but gradually comes to understand.
Power is a major theme. Two Lucifers would bring a lot of power into one story, and it can be about who has more power or how they use their power together.
In the world of 'lucifer meets lucifer fanfiction', a common plot could involve a clash of egos. When two such powerful and complex characters meet, there's bound to be conflict. Some stories may also explore a romantic or at least a deeply emotional connection between them, as they are essentially the same being in different forms, and this connection can be both fascinating and disturbing at the same time.
One possible adam4adam horror story could be about a user who thought he met a friendly person on the platform. They arranged to meet in a public park. But when they met, the other person had a really strange glint in their eyes and started following the first user everywhere, even when he tried to leave. It was a terrifying experience of being stalked by someone you thought was a normal acquaintance from the site.
As I don't know the specific Adam Nabi story, I can't say for sure who Adam Nabi is in it. He could be a regular person with an interesting experience that was made into a story, or he could be a character within a more complex narrative with a special role.
I'm not entirely sure specifically what 'lucifer fiction' refers to. It could potentially be a genre of fictional works that somehow involve the concept of Lucifer, perhaps in a religious, mythological, or even a more creative and fictionalized context.