Power struggle is a common theme. The devil princess may be vying for power within the devil realm or against other supernatural forces. Another theme is redemption. She might be trying to break free from the negative connotations of being a devil.
Power and domination are common. The devil king is usually a very powerful figure, and the story often revolves around their power and how they use or lose it.
One common theme is the struggle between good and evil. Since angels are often associated with good and devils with evil, their interactions and the choices they make highlight this eternal struggle.
Morality. These novels often explore the grey areas between good and evil. Just because a character is a god doesn't necessarily mean they are good, and devils may not always be completely evil. This makes the readers question the traditional concepts of right and wrong. For instance, a devil might be acting out of self - preservation in a world where the gods are tyrannical.
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.
Another theme could be the battle between good and evil. The presence of the devil figure in the school novel sets up a clear opposition to the forces of good, which might be represented by the teachers, some students, or the moral code of the school environment. This can lead to a series of events where characters have to choose sides.
A common theme is gender - bending. The idea of a princess becoming a knight challenges the traditional gender norms of society in these fictional worlds. Another theme is adventure, as the knight - princess embarks on quests, battles, and explores new lands.
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.
Love and friendship are also prevalent themes. The relationships she forms with others, whether it's a deep bond with a fellow knight or a romantic connection, play an important role in the story. These relationships can also be a source of strength for the princess knight during her difficult quests.