Sailor Mnemosyne guards the River of Memory. This river is apart of the Zero Star of Sagittarius. She comes from the planet Mnemosyne, the twin planet of Lethe. Mnemosyne does look a lot like her partner, Lethe, but has very many differences. She wears a light purple dress and instead of the hair loops in the back, it goes straight to four curly ponytails. The look on her face is much more calm and timid then her twin's. She is very caring, and in the 'villian' business, that is her weakness.