Luna

is a fictional character in the Sailor Moon media franchise. She is a black cat who has the ability to talk, and serves as a mentoring figure for the titular character and her companions, the Sailor Guardians. Luna makes her debut in the first act or episode of each version of the series, in which she meets Usagi Tsukino and tells her she is Sailor Moon, and gives her a brooch that allows her to transform. Luna features prominently in the first story arc, and although she becomes a supporting character for the rest of the series, she keeps providing the Sailor Guardians and Tuxedo Mask with advice, her family relationships are explored alongside her partner Artemis and their daughter from the future Diana, and she even manages to transform into a human being at key points of the series (including the ability to transform into a Sailor Guardian in the 2003 live-action series). Profile Luna first appears in the series as a mysterious black cat with a crescent moon mark on the forehead that meets Usagi and tells her she is Sailor Moon, a Guardian destined to fight evil. Luna gives Usagi the mission to find her fellow Sailor Guardians and Princess Serenity, whom, unbeknown to both of them, is Usagi herself. The two of them meet Ami Mizuno, Rei Hino, and Makoto Kino, whom Luna assist to awake respectively as Sailor Mercury, Sailor Mars, and Sailor Jupiter, before encountering Sailor Venus and Artemis, a male white cat that also has the ability to speak and who has been secretly providing Luna with details on her mission. Halfway through the first arc, Luna's backstory is revealed: in the Silver Millennium, she was a servant to Princess Serenity, sworn never to leave her side, as well as an advisor to her mother, Queen Serenity. When the Moon Kingdom fell at the hands of the Dark Kingdom, she and Artemis were put into a long sleep and sent down to Earth to look after the Sailor Guardians, who would eventually be reborn there. Part of Luna's memory was suppressed, in order to make her task easier; she only knew that she was supposed to find and awaken the Sailor Guardians of the inner Solar System.