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Sailor Mini Moon 
is the ninth Senshi introduced in the Sailor Moon anime and the seventh introduced in the Sailor Moon manga. Her civilian identity was Usagi "Chibiusa" Tsukino. She was the daughter of Neo Queen Serenity and King Endymion, Usagi and Mamoru's future selves. She came from 30th-century Crystal Tokyo, where she was a princess, and returned to 20th-century Tokyo for training. 

She and her mother Sailor Moon were referred to as the Double Moon, and sometimes referred to by fans as the Princess Senshi.

In the manga, Sailor Chibi Moon became at least two heads taller than her civilian form after the transformation. This also occurred in the anime, but less obviously