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Diana is a small gray kitten who the Sailor Soldiers meet on their trip to the future Crystal Tokyo. She is the daughter of the alien cats Luna and Artemis and companion to the royal family's daughter, Princess Small Lady Serenity. Like her parents, she has a crescent moon mark on her forehead and can speak. When Chibi Usa transformed into Black Lady and invaded the Moon Palace, Sailor Pluto left the Door of Space-Time, leaving Diana in charge to guard the door. Later on, Diana takes on a human form along with her parents.

Diana (cat form)
This is the form that Diana takes most of the time. She is a small gray kitten with a crescent moon mark on her forehead and has the power to speak.

Diana (human form)
Diana first took the form late in the storyline. She looks to be about the height and build of Sailor Chibi Moon. Though she looks mostly human, she retains a tail.