Common themes include identity crisis. The princess is no longer in her original life, so she has to figure out her new identity. Another is the theme of friendship. She forms new relationships with people in the new world. And often, there is a theme of overthrowing the status quo. The princess may use her new - found knowledge or powers to change the way things are in the kingdom or society she's in.
One common theme is starting anew. The protagonist gets a second chance at life in a different world, often with some special abilities or knowledge from their previous life. For example, in many of these novels, the character uses their modern - world knowledge to their advantage in a medieval - like fantasy world.
Survival is a common theme. When the protagonist is reincarnated as a monster, they often have to fight for their lives in a world that may be hostile. For example, in 'So I'm a Spider, So What?', the spider has to constantly find food and avoid being killed. Another theme is growth. They usually start weak and gradually become stronger through various means like leveling up or evolving.
Another theme is world - building. Since the protagonist has god - like status, they often have a role in shaping or influencing the world they are in. They might introduce new systems, technologies or social orders. In some novels, the reincarnated god - like character may also face moral and ethical dilemmas regarding how to use their power.
One common theme is the struggle for power. The reincarnated protagonist usually starts from a weak position and has to fight their way up through cultivation. Another theme is revenge. They might be seeking revenge for something that happened in their past life. And of course, the exploration of the unknown in the cultivation world, like discovering new techniques and places.
One common theme is self - discovery. Since the character is reincarnated as a girl, they often have to figure out their new identity, which includes dealing with different social expectations compared to their previous life. For example, in 'So I'm a Spider, So What?', the spider girl has to learn about her new body's capabilities and limitations.
Power - building is another theme. Since they are in new and often dangerous worlds, they need to gain power. In 'Re:Zero - Starting Life in Another World', Subaru has to learn how to fight and use his Return by Death ability to become stronger over time. This theme keeps the readers engaged as they watch the characters grow.
A theme of destiny is often present. The princess may be fated to save her kingdom or bring about some kind of change. In some princess light novels, there are also themes related to magic and mystery. Magic might be a part of the princess's power or something that she has to learn to control, and there are often mysterious elements in the plot, like ancient prophecies or hidden secrets about the princess's lineage.
Romance is a very common theme. Usually, there's a relationship between the princess and a prince or a commoner. For example, in many novels, the princess has to choose between her duty and her heart.
Power struggles are also typical. There could be battles within the vampire clan for the throne or for power, and the vampire princess is in the middle of it. This can create a lot of drama and conflict in the story. Also, the theme of identity is prevalent as the vampire princess tries to figure out her place in the world of vampires and humans.
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.