Sailor Coronis

Sailor Coronis is the Sailor Senshi of the planet "Coronis", which was also the homeworld of twins Phobos and Deimos (Sailor Mars' two partners/guardians), and Lead Crow. She was killed by Sailor Lead Crow, so she could take her Star Seed to Sailor Galaxia and win her favor.

Sailor Coronis makes her only appearence in a brief flashback in "Act 53: Stars 4", when her betrayer, Lead Crow, brags about her demise to Phobos and Deimos, during Lead Crow's attack on the Hikawa Shrine to call them out. She is mentioned again in "Act 54: Stars 5", by Kou Yaten (Sailor Star Healer's human guise), along with Sailors' Chū (the Sailor Senshi of Iron Mouse's homeworld), Mermaid (the Sailor Senshi of Aluminium Siren's homeworld), and Mau (the Sailor Senshi of Tin Nyanko's homeworld).

Trivia

 * Coronis (Κορωνίς) is a Greek word for "crow" or "raven". It is also the name of a couple of characters in Greek mythology.