One common theme is the growth of the protagonist. In action harem light novels, the main character often starts out relatively weak but gradually becomes stronger through various battles and challenges. Another theme is the relationship building within the harem. There are different types of relationships, from friendship to romantic feelings, among the main character and the female characters in the harem.
Power struggles are also quite common. This could be battles against powerful enemies in the action part, or competition among the female characters in the harem for the main character's attention. And often, there is a sense of mystery or a bigger plot in the background that the protagonist gradually uncovers as the story progresses. For example, in some novels, there are secrets about the world or the origin of certain powers that are slowly revealed.
One common theme is acceptance. The human protagonist often has to accept the differences of the monster girls in the harem. For example, in 'Monster Musume', the main character has to adapt to the unique cultures and physical traits of each monster girl.
One common theme is power dynamics. In a slave harem setup, the main character often has some form of power or ability that attracts the other characters. For example, in 'The Rising of the Shield Hero', the protagonist's unique skills make others, especially the female characters, gather around him. Another theme is relationship building. The main character has to navigate complex relationships with the members of the harem. In 'Date A Live', the protagonist has to understand and bond with the different female spirits.
One common theme is the growth of the male protagonist. In these light novels, the male lead often starts as an ordinary or somewhat perverted guy and through his interactions with the girls in the harem, he gradually matures. For example, in 'High School DxD', Issei becomes stronger and more responsible as he faces various challenges with his harem members.
In 'hypnotized harem light novel', the theme of self - discovery is often present. The protagonist, through the experiences in the harem created by hypnosis, may learn more about themselves. Additionally, the theme of conflict resolution within the harem, especially when different characters have different agendas because of the hypnotic situation, is also a common one. The harem members may need to work together or compete, which adds to the overall plot complexity.
One common theme is the growth of the main male character. In many harem light novels, the male lead starts off as an ordinary or flawed person. For example, in 'High School DxD', Issei is a pervert at the start, but as the story progresses, he grows stronger and more mature. Another theme is the exploration of different female personalities. Each girl in the harem usually has a distinct character trait, like the tsundere type or the shy type.
Power progression is a common theme. The OP main character usually starts from a certain level of strength and becomes even more powerful over time. Another is the development of relationships with multiple female characters. They often start with misunderstandings or the main character helping the females in some way, and then relationships grow.
One common theme is the struggle of the male lead in choosing among the multiple female love interests. Another theme is the development of different relationships with each girl, which often includes friendship, rivalry, and of course, romance. Also, there is usually some sort of unique setting, like a school or a fantasy world, that serves as the backdrop for these relationships to unfold.
The themes often include adventure. The protagonist and his harem usually embark on various adventures in the fantasy world, facing monsters, solving mysteries, etc. Love triangles or more complex relationship webs are also common. There might be jealousy or competition among the harem members for the protagonist's attention. And self - discovery is another theme. As the protagonist interacts with the harem, he also discovers more about himself, his values, and his place in the world. For example, in some novels, the protagonist realizes his own strength and leadership abilities through his interactions with the harem.
Love and friendship are typical themes. The harem members and the protagonist develop feelings of love or deep friendship over time. In the fantacy setting, they might face challenges together that strengthen their bonds. Another common theme is the exploration of different races or abilities. In many of these novels, the harem consists of characters from different races or with unique abilities, and this adds to the richness of the story and the relationships within the harem.
Common themes include self - discovery. The female character often has to figure out who she is while being surrounded by all these different male personalities. Romance is also a big theme, obviously. The female lead has to navigate her feelings towards multiple guys. And there's usually a sense of competition among the male characters for the female's attention, which adds an interesting dynamic to the story. For example, in 'Ouran High School Host Club', Haruhi has to deal with the different approaches of the host club members towards her.