Hardly anything is known about Chibi Chibi. She is an adorable little girl who appears in Sailor Stars. She is unable to form sentences, but can say the word Chibi and can copy the ends of other people's sentences. She resembles Usagi and Chibi-Usa, but it is unknown where she came from. She has many powers and is able to hypnotize Usagi's mother into thinking that the two are sisters. She is also able to divert the attention of vicious dogs. Chibi Chibi appears
to be about 2 or 3 years old, and carries with her a parasol. She also LOVES to eat, especially cake.
In the last episode (episode 200) Sailor Moon and Galaxia face off in a final battle, the outcome of which will affect the fate of the entire universe. It is revealed that Galaxia was once the strongest senshi who ever lived. She battled chaos, a power that would destroy the entire galaxy. In order to save the universe, Galaxia sealed Chaos inside herself. To do this, she let her starseed out into galaxy to find the one of love and justice, and become the light of hope. Chibi Chibi is this starseed/light of hope. In other words-Chibi-Chibi is the light of hope from Galaxia's starseed. Confused yet? According to the manga however (and Naoko Takeuchi), Chibi-Chibi is is Sailor Cosmos. Sailor Cosmos is Sailor Moon's future self. She is Sailor Moon minus Usagi. Therefore, she has no fear in her heart. (Sailor Cosmos does not exist in the anime, but notice the hairstyle. Coincidence? I think not.)
Click Here to see a picture of Sailor Cosmos and Chibi Chibi