Guardian Chaos by Levy Rasputin
One of the mystery characters only named at the very end of the Sailor Moon manga. Guardian Chaos was hinted to have been a sort of opposite to Guardian Cosmos. In that she was the guardian of the Cosmos Crystal, Guardian Chaos was the guardian of Chaos’ core Chaos Seed. Both were ambiguously mentioned by Guardian Cosmos as having melted into the Galaxy Cauldron along with Chaos, and at some point they will be reborn.
Because it never actually appeared on panel, I imagined Guardian Chaos as very Lovecraftian in nature. Whereas Guardian Cosmos is a fairy, Guardian Chaos is a parasite. I imagined it as a writhing, shadowy mass of tentacles that sucks all light and darkness into it. The only discernible form a person can see is the outline of someone, maybe a man and maybe a woman, with the same glaring white eyes and white mark as Chaos had.
Levy added in the beautiful red, purple, and green background and made Guardian Chaos invoke the image of a scorpion.