My Sailor Chibi-Chibi Moon Page:
ChibiChibi is the mysterious little girl who arrives in the second arc of SailorStars. She resembles Chibi-Usa and Usagi in carefree innocence and odango hairstyle, and she uses Chibi-Usa's method of hypnotism to get what she wants, such as getting Usagi's mother to believe that she and Usagi are sisters. She is thought to be Chibi-Usa’s daughter at first.
She only says "Chibi Chibi" or copies whatever anyone else says.
Incredibly cute, she loves to eat food as much as Usagi. She often is oblivious to what is going around her, at least on the outside. She charms vicious dogs and throws expensive porcelain dolls into the air without care.
ChibiChibi is also a Sailor Senshi, Sailor ChibiChibi or Sailor ChibiChibimoon, and she is the one who leads Kakyuu to Earth using the chalice. She also gives Eternal Sailor Moon a new powered-up attack.
Her true identity is revealed in episode 200 as the hope of Galaxia's star seed; the star seed was released when Chaos was infused into Galaxia. Eventually ChibiChibi found Sailormoon on Earth. She gives Sailormoon a sword to defeat Galaxia, the sword actually being herself, though Sailor Moon initially refuses it. However, when she is used in self-defense, the sword breaks; ChibiChibi's still body appears in front of Princess Serenity before vanishing. Once Chaos is released from Galaxia and the star seeds are returned to their owners, ChibiChibi appears in Prince Endymion's arms in front of Sailor Moon. She smiles at the Sailor Senshi, then disappears.
In the Manga she is a form of Sailor Moon who was sent as a little girl so that she wouldn’t confuse the senshi. She has been sent by Sailor Cosmos (the ultimate form of Sailor Moon) the ruler of the entire universe, to help Sailor Moon defeat Chaos. This is the one I prefer as it explains why she is Sailor Chibichibimoon and why she looks like Sailor Moon and not Galaxia, but it would seem strange that Sailor Moon would be the ruler of the Universe and why would she need to become her ultimate form???