Shadow Galactica been played by two actresses, Haruko Yamaguchi and Megumi Wakamatsu. and appear only in Act 48 of the manga. Sailor Lethe is named for a naiad in Greek mythology, and for a river of the Greek underworld where dead souls go to forget their past lives before being reincarnated. Sailor Mnemosyne is named for the Titaness of memory, the mother of the muses, as well as another river in the underworld which brought remembrance and omniscience. Sailor Lethe has an attack called "Galactica Myosotis Alpestris", which she used to attack Usagi. Myosotis alpestris is the name of an alpine species
Chinese mythology generally said to be inhabited by souls of the dead (see hun and po. Inhabited by souls of dead humans and various supernatural beings this subterranean hell is known by various names, including Diyu or the Yellow Springs. In more historically recent mythology, this subterranean land is generally described as somewhat similar to the ideas about the land above land above. It possesses a hierarchical government bureaucracy, centered in the capital city of Youdu. The rulers are various kings, whose duties include making sure that the souls of dead humans are correctly placed according to the merits of their life