There's also 'Date A Live'. It involves the main character having to deal with multiple female characters in a rather unique situation. The interactions between the characters are complex and interesting, much like what you might find in a 'harem queen light novel'.
One main theme is probably relationships. With the harem aspect, there are multiple relationships that the main character has to navigate. Another could be power dynamics, as in a harem situation, different characters may have different levels of power or influence.
Well, 'High School DxD' has a bit of a harem aspect where the main character is surrounded by various female characters, somewhat like in 'loner harem meister light novel'. The story is filled with action and some comical moments as the protagonist navigates his relationships with the girls.
One similar light novel could be 'In Another World with My Smartphone'. It also has elements of a protagonist in a different world with various interactions and relationships. Another one might be 'Overlord', which features a powerful main character in a fantasy world with his own 'followers' of sorts. And 'Konosuba' is also a good choice as it has a comical take on the isekai genre with a group of misfits adventuring together.
I recommend the following harem novels to you: "Protagonist Substitution System"-The protagonist has the help of the system to become the male protagonist of the harem! "Golden Flash of Ninja Realm"-Ninja Realm setting, the male protagonist rejected the harem and took advantage of the system! "Palace Conspiracy: The Power of the World"-In the ancient palace struggle, the female protagonist entered the harem and cut through the thorns! "The World of Women in the Harem"-In the ancient palace, the three female protagonists conspired to rule the world! I hope you like my recommendation, Mwah ~😗
Another option is 'Ascendance of a Bookworm'. The main character has to navigate a new world and rise in status, which has some parallels to the idea of becoming a queen in 'I shall become the queen light novel'. It's a great read for those who like the genre.
Well, 'Konosuba' is a great recommendation. It's an isekai light novel where the main character is transported to another world and has a group of companions which could be considered a form of harem in a comical way. Also, 'Sword Art Online' has some elements of isekai and relationships that could be related to the idea of a harem, especially in the later arcs of the story.
The following were a few recommended harem novels, some of which had the empress as the main character: " The King's New Favorite: The Empress is a Little Palace Maid,"" The Deposed Empress Shocks the World,"" The Explosive Pet Cute Queen: The Emperor, Too Impudent,"" The Empress, Your Harem Should Be Layoff,"" A Scientific Guide to Raising Pigs in the Harem,"" The Heart of the Palace Is Mysterious,"" The Empress Has a Dream Space,"" The Empress's Upstanding: The Palace Maid also Fades,"" The Qing You of the Harem,"" Empress Xie," and so on. These novels cover different plots and styles, including palace fights, transmigration, favorite novels, and other elements. I hope you will like one of them.
😋I recommend the following books to you: 1. The main character also traveled to ancient times, and it was also a story that rose up in the harem. The similarity was high. 2. [The Two-Faced Queen: Step by Step]: It was also an ancient harem struggle story. The female protagonist also experienced setbacks and gained a chance to rise. 3. " The Empress Wants to Be Widow Every Day ": Just like the Empress's golden brilliance, the female protagonist also wants to be a widow after facing an encounter, but she also walks into the battle in the harem. I hope you like my recommendation.😗
One similar light novel could be 'Harem in the Labyrinth of Another World'. It also has elements related to harems and a unique fantasy world setting.