So i was randomly caught up in a TV-tropes reading spree and came across the star guardian's origin?
Before you bring out your pitchforks, this is only my ASSUMPTION. I have no way of knowing wether this is true or not - i just found it interesting as i stumbled upon it by coincidence.
This is "Glitter force". It seems to be the primary inspiration for the look of the (female) star guardian skins.
Now while i realize Lux seems to be at least partly inspired by Sailor Moon, i think our star guardians resemble these characters much more closely.