The whole 'accidentally falls into the protagonist's lap' scenario feels so tired now. It's usually some variation of a klutzy girl tripping over air, spilling her books, and landing right in the guy's arms. That meet-cute is practically a genre requirement, but it removes any agency. I'd love to see a harem plot where the central person deliberately seeks out their partners, or the connections form through shared work or a common goal instead of perpetual awkwardness.
Another one I'm weary of is the 'first girl' trope. The very first love interest introduced, often a childhood friend or the girl next door, almost never wins. She exists to be safe, familiar, and ultimately left behind as the protagonist explores more 'exciting' options. It sets up a weird dynamic where stability is framed as boring. The childhood friend in 'Love Hina' is a classic example—she had zero chance from the start, and it always left a sour taste.
Power imbalances are baked in but rarely examined. The protagonist often holds some form of leverage, like being the only competent person in a club, the heir to something, or possessing a unique skill. The harem forms around that status, not the person. I keep wondering if any of these characters would stick around if that external power vanished. The relationships feel transactional, built on convenience and proximity in a shared living space or school club, which makes the eventual 'choice' ring hollow.