Well, in this kind of light novel, the demon king could be summoning the hero to challenge the traditional roles. Instead of fighting each other, they might work together against a corrupt system in their world. For example, there could be an overarching evil force that is oppressing both the demons and the humans, so the demon king realizes that the hero's power is needed to defeat it.
A prevalent theme is redemption. Sometimes, the demon king may not be entirely evil, and there could be a chance for him to be redeemed, or the hero may have to struggle with his own dark side. Also, friendship and loyalty play a part. The hero often has comrades who support him, and the demon king may have his own followers. Their relationships within their respective groups are important aspects. In addition, the theme of sacrifice is often seen. The hero may have to sacrifice something precious to defeat the demon king or vice versa.
I'm not sure which light novel you're referring to because the sentence itself doesn't provide enough information. If you can provide more context or specify the name of the novel, I will try my best to provide you with relevant information.
The demon king is surely one of the main characters. He must have some unique characteristics, like great power and a complex personality. The hero is another main character. He could be a young and brave individual with some special abilities. And there may be other important characters, for example, a wizard who has some connection to the summoning spell or a princess who the hero is trying to protect in his own world and that affects his actions in the demon king's realm.
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.
Sure. 'Overlord' is a great one. It features a powerful demon - like character who rules over his territory in a new world. Another is 'The Rising of the Shield Hero', which focuses on a hero who has to face many challenges, including dealing with false accusations while fighting against the forces of evil, which in some ways can be related to the concept of the demon king.
The background of a Demon King Hero's work usually referred to the world structure and background setting of the novel, anime, game, and other works.
The background of Demon King Hero's works usually involved some fantasy or science fiction elements, such as:
This world is made up of many races, some of which have special abilities or powers.
There are many powerful demon kings and brave people in this world. They have extraordinary strength and wisdom, and they fight to achieve their goals.
The political system in this world was usually ruled by the Demon King and the Bravehearts. They had great power and resources and maintained their ruling position through various means.
There are all kinds of mysterious magic and technology in this world. These magic and technology may have an important impact on the battle of the Demon King Hero.
The background of the Demon King Hero's works usually involved many complicated elements and plots to attract the interest and attention of readers or audiences.
One common theme is the battle between good and evil. The hero represents good and the demon king represents evil, and they fight for the fate of the world.