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The Solar System Guardians never aged physically past the age of early 20s.Īfter she became queen, she lost her power as a Sailor Guardian. Once she became Queen, Serenity ceased to age, and continued to retain her youthful appearance for well over ten centuries. Usagi became queen at age 22, the same year she gave birth to Chibiusa. She rules over the entire Earth from the Crystal Palace, situated in what was formerly Juuban District. Usagi learns that she will be given the title "Sovereign of Earth" and Mamoru will become King Endymion alongside her. She is first seen in this future form in Act 16 of the manga.
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In the Black Moon arc, it is revealed that Usagi, as Serenity, will eventually become the queen of a new Silver Millennium centered in a city called Crystal Tokyo, which will already exist in the 30th century. Although aware of the situation, Chibiusa rarely does this. This form is the one that Chibiusa considers as truly being her mother, while Usagi of the past is regarded as more of a big-sister figure and many characters often mistake them for sisters.
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Her face and facial expressions are drawn to look more mature than the 20th century Usagi, but her iconic hairstyle is retained. The crescent moon is always visible on her forehead, just as it was with her princess form. She wears an altered version of the dress she wore as a princess, with a large, wing-shaped bow replacing the smaller one of the princess outfit.
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