One of the main themes could be the relationship with darkness. Maybe the protagonist finds solace or a sense of self in the darkness that they don't find in the light. It could also explore themes of isolation, as being comfortable in the darkness might imply a certain detachment from the norm which is often associated with light and brightness.
Since I don't have specific knowledge about this light novel, it's hard to name the exact main characters. However, based on the title, we can expect a central character who feels at ease in the darkness. There may be other characters around this central figure, such as a mentor - like figure who tries to guide the character's understanding of their comfort in the darkness, or a peer who shares a similar experience or at least tries to empathize with the main character's situation.
I'm not sure if it's a popular novel. I haven't heard much about it in mainstream discussions, but that doesn't mean it doesn't have a dedicated following.
I'm not sure exactly as I haven't read it. But perhaps it could be about a character who finds solace or a sense of belonging in the darkness, maybe in a metaphorical sense like being an outcast in society and feeling more at ease in seclusion which is symbolized by darkness.
Another theme is the coexistence of hope and despair. In many such novels, even in the darkest of times, there are glimmers of hope. Take 'The Hunger Games' for instance. The Capitol represents the darkness with its oppression, but Katniss's defiance and the hope of a better future for the districts are the light. This theme often makes the story more complex and engaging.
The most obvious theme is the struggle between good and evil, where light often symbolizes good and darkness represents evil. For example, heroes in the story might fight against dark forces.
I'm sorry, I don't know who the author of this web novel is. There could be many web novels with similar titles, and without more information, it's difficult to determine the specific author.
One of the main themes is the struggle between good and evil. The hero often has to make difficult choices that blur the lines between the two. Another theme is redemption. He has a past that he is trying to come to terms with and find a way to redeem himself.
The theme of self - improvement is also there. For example, Kazuma, the main character, starts as a bit of a loser but gradually grows in the new world. And the light novel also has a theme of satire, poking fun at common tropes in RPGs and fantasy stories.
I'm not very familiar with this novel specifically. It might be a rather unique or niche work. Maybe it delves into themes like self - acceptance within a dark or difficult situation.
Another theme is the idea of balance. Many 'between light and darkness fanfiction' explore how an over - emphasis on either light or darkness can lead to chaos, and that true harmony lies in finding a middle ground. For example, a character might realize that pure good can be just as dangerous as pure evil if not kept in check. The stories often show how the characters grow and change as they navigate this balance.