One common theme is the struggle between good and evil. The hero represents the good side, and the demon king the evil, and their conflict drives the plot. For example, in many novels, the hero tries to defeat the demon king to save the world.
One popular 'demon king x hero light novel' is 'The Rising of the Shield Hero'. In this story, the hero is wrongly accused but still has to face various challenges including the threat from the demon forces. It has an interesting take on the relationship between the hero and the forces that seem like the 'demon king' side at times.
One interesting concept is the idea of a villain redemption arc within the fanfiction. Maybe the hero sees something in the villain that makes them believe the villain can change. Another concept could be a role - reversal, where the hero starts to act more like a villain and the villain like a hero for a while, creating a really unique and complex dynamic.
There could be. Fanfic writers often take creative liberties. In a 'Batgirl x Joker' fanfic that subverts the norm, it might show how the Joker's chaos could be redirected or influenced by Batgirl in a new way. Maybe it could involve Batgirl trying to understand the Joker on a deeper level rather than just fighting him, which would be a significant departure from the usual dynamic.
Begin by brainstorming ideas for the relationship between the hero and the villain. Do you want it to be a love - hate relationship? Or maybe a begrudging respect? Once you have that in mind, create a setting for your story. It could be a modern city, a fantasy world, etc. Outline the major events that will happen in the story, such as how they first meet, what causes their relationship to change, and how it all ends.
One idea could be that the villain is secretly in love with the hero and tries to protect them from a greater threat without the hero knowing. Another could be a situation where the hero gets injured and the villain has to take care of them, leading to a change in their relationship. Or perhaps the villain and hero are forced to team up due to a common enemy and during that time, a romantic tension builds between them.
Develop their relationship gradually. Start with small interactions like sparing each other's lives in battles or having short conversations. Then, as the story progresses, these interactions become more meaningful and frequent. For example, the villain could start leaving little hints or gifts for the hero that show their growing affection. Also, give reasons for their attraction. It could be the hero's sense of justice that the villain secretly admires, or the villain's intelligence that intrigues the hero.
One popular one is 'A Hero's Conquest of the Demon Queen'. It tells the story of a young hero on a quest to vanquish the powerful demon queen, but along the way, he discovers there's more to her than meets the eye.
Well, it depends on different readerships. In some fantasy - loving communities, it is very popular. For example, the idea of a hero having to deal with a demon queen, whether it's through combat, negotiation or an unexpected alliance, offers a lot of room for plot twists and character development. It can also explore themes like good vs evil in a more nuanced way compared to traditional stories.