<P> Chibiusa's birth name and official title is Princess Usagi Small Lady Serenity (うさぎ S (スモール) L (レディ) セレニティ, Hime Usagi Sumōru Redi Sereniti). She is adopted as a member of her mother's family, using the alias Usagi Tsukino, in the 20th century . She is given her nickname to differentiate from the older Usagi Tsukino, Sailor Moon . The nickname is a combination of chibi (meaning small person or small child) and her given name, Usagi . </P> <P> Author Naoko Takeuchi describes Chibiusa as a precocious person who likes pulling pranks . She is the daughter of Neo-Queen Serenity and King Endymion . Her real name is the same as her mother's, but is called Chibiusa in Japanese to avoid confusion between the two . Her name in several English - language versions of Sailor Moon, Rini, is a diminutive of "Serena", the name of her mother . She is known for having pink hair put into a unique style that resembles rabbit ears on top of her head . Chibiusa's hair is apparently truly pink, and not just colored that way for stylistic purposes; its color is stated in the manga's first Picture Diary and in the poem about her in the Sailor Stars CD single . </P> <P> Exposure to the Silver Crystal renders all of Crystal Tokyo's inhabitants functionally immortal, and her frequent time traveling further complicates approximation of her age . </P> <P> Chibiusa is 5 years old approximate in both civil registration and physical appearance; however, she possesses a degree of intellectual maturity that is normally non-existent in a 5 - year - old girl . In act 20 of the manga, it's stated that she is chronologically 900 years old, which lends credibility to her apparent wisdom, maturity, and rather serious personality over her teenage biological mother Usagi (in the 20th century). Her youthful appearance attributed to the fact that her physical body inexplicably halted its natural aging process when she was five . The reason for this is assumed to be caused by having not "awakened" as a Sailor Guardian, which eventually occurred when she first became Sailor Chibi Moon . </P>

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