Chibichibi is the my
sterious girl that fall from the sky with an umbrella, and
disguised as Usagi's little sister. She lives with her and nobody
really knows who she is till the end of SailorStars.
Chibichibi acts a lot as Usagi. She eats everything she wants and is really mischievous. Once she threw a piece of cake to Seiya's face when he was about to tell Usagi he was Sailor Star Fighter, and also she opened once a door where Seiya was, making him fall over Usagi. (The others found them like that ^_^) She throws valuable things without care and makes friends of dangerous dogs. She only says ChibiChibi and repeats what others say, usually short things.
His name means Little little. She has Kakyuu's chalice, causing red butterflies to appear near her, and Kakyuu's perfume to cover her, reason of the Starlights to attack her. She is actually the hope of Galaxia's Star seed (in the Manga she is Sailor Cosmos) and when Galaxia is healed, she leaves giving a "Thank you!" to Usagi.