A common theme is the struggle between good and evil. The characters often have to fight against the demons representing evil, while also dealing with the internal struggles that the curse brings. Another theme is redemption, as some characters might be cursed but strive to break free and become better.
One common theme is the battle between good and evil. The demon huntress is often the symbol of good, fighting against the demons that represent evil. Another theme is self - discovery. As the huntress faces different challenges in her battles, she also discovers more about herself, her powers, and her place in the world.
One common theme is the clash of cultures. Demons usually have their own set of values and norms which are very different from humans (the strangers in their world). This can lead to interesting conflicts and reconciliations.
A common theme is the struggle between good and evil. The demon princess often has to decide whether to follow her demonic nature or embrace more 'human' values. Another theme is self - discovery, as she figures out who she really is and what her place is in the world.
The theme of change is also prevalent. His entire lifestyle, values, and relationships change. He might go from being feared to being respected or befriended. There is also often a theme of secrecy. He has to keep his past a secret in some cases, which adds an element of suspense to the story. He may struggle with when and how to reveal his true identity, especially when he starts to care about the people in his new life.
Power struggle is a common theme. Usually, the demon king girl has to deal with various forces that either oppose or try to use her power. For example, in many stories, there are other kingdoms or powerful entities that see the demon king girl as a threat.
Power. Usually, the reincarnated demon king has some form of great power from their past life that they can tap into. This power often makes them stand out in the new world they are in.
Power management is a common theme. The demon king often has to figure out how to use his power effectively in a more practical sense, not just for destruction.
One common theme is power struggle. The demon princess often has to fight for her position or power in a world full of magic and chaos. Another theme could be love and betrayal. She may fall in love with someone who might later betray her trust due to the chaotic nature of the magical world.
Survival in a hostile world. Whether it's the demon lord against other powerful entities in the magical world or adapting to a modern world like in 'The Devil is a Part - Timer!', the theme of survival is quite common. The demon lord has to use their wits and powers to stay alive and relevant.
Power and growth are common themes. When a character is reincarnated as a demon or in a world with demons, they often have to gain power to survive. For example, in 'That Time I Got Reincarnated as a Slime', the slime protagonist gradually becomes stronger. Another theme is identity. The reincarnated character may struggle with their new demonic identity or how they fit into the world of demons.