Mizugeiko is a Remless sent by Tiger's Eye to fight Sailor Moon. She attacks by shooting beams of deadly water, or else rainbow beams that turn into deadly small ball-like objects. She appeared in Sailor Moon Super S Episode 9, The Trouble With Love.
Tiger's Eye was looking into Raye's dreams when Sailor Moon and Sailor Mini Moon appeared, so he summoned Mizugeiko to fight them. Her attack was stopped by Sailor Mercury using Shine Aqua Illusion. Sailor Mini Moon summoned Pegasus with Crystal Twinkle Bell, and Sailor Moon destroyed Mizugeiko with Moon Gorgeous Meditation.