The Castles of the Sailor Guardians (セーラー戦士の城, Sērā senshi no shiro) also known as the Solar System Castles (太陽系の城, Taiyōkei no shiro) are the castles that were given by Queen Serenity to the Solar System Princesses following their births.
These castles appeared in the manga only, the first mention of them is during the "Dream Arc" (Act 48) when the Sailor Guardians ask for more power to help Sailor Moon. The castles have different shapes and orbit the home planets of the Sailor Guardians.
Their interiors appear when the Outer Sailor Guardians (minus Sailor Saturn) came to them in Act 53 of the manga during the battle with Sailor Galaxia, we can constat that the interior is technologically advanced and that the castle is inhabited even in the absence of the Sailor Guardians by their respective Sailor Power Guardians. Sailor Venus's castle was also shown in the first chapter of the Codename: Sailor V manga.
List of Castles[]
| Name | Image | Princess | Etymology |
|---|---|---|---|
| Mariner Castle | Mercury | Named after Mariner 10, the first spacecraft sent to Mercury. The Mariner space program itself went by the name 'mariner' as a synonym for 'sailor,' in line with the pattern of naming space probes after nautical terms. | |
| Magellan Castle |  |
Venus | Named after Magellan, the first spacecraft to image the entirety of the surface of Venus. The mission as a whole was named after Portuguese explorer Ferdinand Magellan. |
| Phobos and Deimos Castle | Mars | Named after Phobos and Deimos, the two natural satellites of Mars. The former is named after Phobos, the Greek god of dread, and the latter after Deimos, the Greek god of panic. Both are the sons of Ares (Mars). | |
| Io Castle | Jupiter | Named after Io, the third-largest moon of Jupiter. The moon is named after Io, one of the lovers of Zeus (Jupiter) in Greek mythology. | |
| Titan Castle | Saturn | Named after Titan, the largest moon of Saturn. The moon is named after the Titans, who were the children of Uranus and Gaia (Earth) in Greek mythology. | |
| Miranda Castle |  |
Uranus | Named after Miranda, the fifth-largest moon of Uranus. The moon is named after Miranda, a character in William Shakespeare's play The Tempest. |
| Triton Castle |  |
Neptune | Named after Triton, the largest moon of Neptune. The moon is named after Triton, a Greek god of the sea and the son of Poseidon (Neptune) and Amphitrite. |
| Charon Castle |   |
Pluto | Named after Charon, the larget moon of Pluto. The moon is named after Charon, the ferryman who transports souls of the deceased across the rivers Acheron and Styx in the underworld in Greek mythology. |
