Well, the most obvious unique element is the combination of two very different concepts. Harry Potter's world is full of magic, spells, and wizards, while a barricade is usually something more related to a physical barrier or a symbol of resistance in a non - magical context. When they are combined, it creates a whole new set of possibilities for the story. For example, the barricade could be enchanted, or it could be a portal to a new part of the wizarding world that Harry and his friends have to explore.
A popular 'bumblebee barricade fanfic' is 'Alliance in Crisis'. This fanfic takes a different turn as it has Bumblebee and Barricade forced to work together in an unexpected situation. It has a lot of suspense as they try to overcome their differences and work towards a common goal, all while dealing with their own loyalties.
Another good one is 'Harry Potter and the Barricade's Secret'. It delves deep into the relationship between Harry Potter and the barricade, exploring how they interact and how the barricade might have its own hidden powers in the wizarding world. The character development in this fanfiction is quite well - done.
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.
Lucifer and Satan were not the same person. Although Lucifer was called the Morning Star, it did not explicitly indicate that he was Satan. Satan was the name of the ancient snake, and Lucifer was an independent existence. Therefore, Lucifer Morgenstern was not Satan.
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.