Chibi Chibi kinda ahem ... (tongue in cheek) ... fell into Usagi's life. She floated through a beam of light on an umbrella and landed in Ichinohashi Park. When she got there, she found an injured Kakyuu
Hime (the Starlight's princess) so Chibi Chibi hid her in an incense burner and nursed her back to health. Chibi Chibi comes to stay with the Tsukino family. She can't speak much at first, except to repeat the last few words of the last
sentence (much to Minako's annoyance ^^) so no one knows her real name. Ikuko-mama called her Chibi Chibi and it stuck. Chibi Chibi also doesn't say why she's here, though everyone has a theory :D Rei thinks it might be Usagi's little sister
(and that maybe Usagi is a little forgetful ;) Ami thinks it may be Chibiusa's little sister, who decided, after hearing her big sister's adventures, to go to the past herself and Haruka agrees. Setsuna waves it off on some formality that the
Queens of the Silver Millennium can only have one child so she thinks it might be Chibiusa's daughter. Chibi Chibi, despite her total lack of co-operation with talking to the senshi, is still incredibly lovable and very kawaii (^^!) Usagi
trusts her 100% and finds Chibi Chibi to be a loyal and comforting friend. When Chibi Chibi decides to talk for really, her words are always a comfort and speak of wisdom far beyond her years. Chibi Chibi is also the tiny sailor soldier,
Sailor Chibi Chibimoon (the "moon" was added by the four Asteroid Senshi.) Despite her small size, she's a very powerful ally. She has on many numerous occasions, saved Sailormoon's life. Sailor Chibi Chibimoon carries with her a
staff that she can create a protective aura that blocks any attack. Chibi Chibimoon is also the soldier, Sailor Cosmos which she transformed into in Act 51. Sailor Cosmos tried to destroy Sailor Chaos long ago but she was far too strong and
Cosmos was forced to flee in order to save herself. Her earth form, Chibi Chibi, was guided by Sailor Cosmos to take the right path and not make the same mistakes again.