Is possible to write a harem which is more about the MC being simply a plot device to tell the story of each girl being the MC of their own character arc and story, and have the harem being nothing more than a tree of stories?

Something similar to how the MC in haruhi susumiya is nothing but an excuse for the writer to have the reader to self insert as a blank slate character who the other characters react to?

I want to make a harem ryona eroge beatemup of ash versus the pokemon girls.

Since I'm only a faggot that watched the first season of anime, I wanna ask for what should I add in my game.