Luna (ルナ, Runa) 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,[1]: Act 19  and even manages turn 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).[2]