Short answers, pulled from the story.
The defining characteristic of the harem genre is the deliberate emptiness of the protagonist. Creators construct stories where the central figure possesses almost no distinct personality to serve as a blank canvas for the audience. This structural choice transforms the story into a shared fantasy where the protagonist's lack of definition becomes their greatest strength.
The harem genre emerged in Japan during the 1970s. It evolved from early light novels and manga that experimented with romantic entanglements before its popularity surged in the late 1980s and 1990s. The rise of dating simulator games significantly drove this expansion by allowing players to directly influence relationship outcomes.
The protagonist remains willfully ignorant regarding the romantic intentions of their suitors to delay commitment indefinitely. This narrative device maintains the status quo of the harem by ensuring no single relationship is prioritized over the others. The resulting cycle of unrequited or unacknowledged affection defines the genre.
The reverse harem genre targets female audiences by featuring female protagonists courted by multiple male suitors. This format flips the dynamic of the original traditional harem which focuses on a male protagonist surrounded by women. The genre also embraces same-sex relationships through yaoi and yuri harem works.
Critics argue that the harem genre perpetuates unrealistic and often misogynistic portrayals of women and relationships. Female harem members frequently lack agency and distinct personalities while existing primarily to desire the self-insert protagonist. This dynamic reinforces the mythos of men being entitled to female affection.
A harem ending occurs when the protagonist ends up in a polyamorous relationship with all of the suitors. This outcome rejects the notion of exclusive monogamy and allows the story to remain open to interpretation. The lack of a definitive resolution keeps the fantasy alive by preventing the narrative from closing the door on any potential romantic possibility.