Artemis is a white male cat from the planet Mau, marked by a yellow crescent moon on his forehead. He serves as the guardian and advisor to Minako Aino, also known as Sailor Venus. After the fall of the Silver Millennium, Queen Serenity sent Artemis and Luna to Earth using the Silver Crystal, tasking them with awakening and guiding the Sailor Guardians. In times of crisis, Artemis can temporarily take on a humanoid form with pale skin, long white hair, green eyes, and a crescent symbol, which he once used to rescue Minako from danger. He helps Minako evolve into Super Sailor Venus by granting her the Venus Crystal, reflecting their deep bond. Artemis provides both emotional support and strategic guidance, balancing mentorship with occasional comedic mistakes. His relationship with Luna grows from initial tension to a lasting partnership; they eventually marry and have a daughter, Diana, who becomes an advisor to Chibiusa. Artemis has a critical yet encouraging nature that contrasts with Luna’s sternness, yet both remain dedicated to protecting the Sailor Guardians. His name references the Greek goddess of the moon, a connection Minako playfully notes.