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Diana is the only daughter of Artemis and Luna from the thirtieth century future of Earth, Crystal Tokyo. She is the guardian feline and devoted companion of the Crown Princess of Crystal Tokyo, Chibiusa. This is the second anime depiction of the original manga character.
Diana retains most of her original manga appearance, being a small white-gray kitten with whiskers, pale pink ears on the inside, and a collar with a yellow bell on it. The only difference is that Diana's eyes are pale blue while in the original anime, they were dark red.
Like Chibiusa, King Endymion and the four Sailor Senshi of the inner Solar System, Diana was one of the few who had managed to withstand the Black Moon's assault and not fall unconscious like the rest of Crystal Tokyo's subjects and queen. She says by her beloved King's side and is determined to do whatever she can to save their homeland.
- In the original anime, Diana did not debut until Sailor Moon SuperS.