LitRPG tag. I have no interest in seeing numbers and text blocks in a story. It takes me out of the flow and forces me to deal with memorizing an often overly intricate power system rather than drawing me into the narrative.
I don't care that the hero beat the giant man-eating mantis because he...
There's no such thing as a real harem. The women compete for the man they like to monopolize his affection and attention.
If the man in question is deceptive, he will manipulate them in a way that allows him to use them without any of them knowing.
If he isn't, the story will end with one girl...