Just saying "sci-fi/fantasy princess" is basically too broad of a category for me to work with.
You have the world of highly gendered, kid-targeted princesses, such as the Disney princesses or Barbie princesses. You have the mythical royalty like the goddesses of the Greek and Roman pantheons. You have all the fighting girl characters from video games like Zelda and Peach. Space action princesses like Leia Organa or Voltron's Alura. Oh, jeez, and that brings anime into the mix. Where do I even start?