Eris and Rhea Picture

Eris is a Dwarf Planet, only slightly bigger than Pluto. Also, in Mythology, Eris is the Goddess of Chaos/Discord. So, she's a mix of most of the Stardroids. Also, she's not a Moon/Star Droid, she's a "Lost Star Child", At least by the Star Soldiers.

Rhea is Saturn's Moondroid,