One common theme is the growth of the protagonist in terms of power level. They usually start from a relatively weak state and gradually become stronger through various challenges and experiences. Another theme is the complex relationships within the harem. There are often different types of relationships like friendship, admiration, and love among the female characters towards the male protagonist.
One popular 'top leveling harem light novel' is 'Sword Art Online'. It has elements of leveling up in a virtual world and also has a harem aspect with multiple female characters having feelings for the main character. Another is 'Overlord'. The protagonist, Momonga, is in a situation where he has to level up his power in a new world and has various female followers which can be considered a harem in a sense.
Well, 'Konosuba: God's Blessing on this Wonderful World!' is a must - mention. Kazuma is reincarnated in a fantasy world and teams up with a group of misfits, including some female characters who form a sort of harem around him. It's known for its humor and unique take on the isekai genre with harem elements.
One popular top harem light novel is 'Date A Live'. It features a male protagonist who has to deal with a group of female spirits in a harem - like situation. The story is filled with action, romance, and interesting character interactions.
Yes, it is quite popular. 'Solo Leveling' has a large and dedicated fan base around the world. The story, with its unique take on the isekai and leveling - up genre, has captured the imaginations of many readers. It features an interesting protagonist and a well - developed power - up system that keeps readers engaged from start to finish.
Solo Leveling is both. It originated as a web novel and was then transformed into a manga. The manga adaptation brought the story to life visually for many fans.