I brought this up in Discord and did not get quite the result I had hoped. (I was hoping for discussion. Silly roleplay happened instead. It was fun to watch but not what I was aiming for.)
I am unlikely to write this, but I present this idea for your consideration and perusal: Star Wars, but instead of Jedi and Sith, you have Magical Girls. And for those familiar with the Magical Girl genre, think PreCure or Sailor Moon, not Madoka.