Chibi-Chibi is a little girl who just fell from the sky. Kinda like what Sailor Chibi Moon did. Chibi-Chibi was quite young at the time. She has no parens or guardians at all. When Serena asked her where she had come from, she replied with "Chibi Chibi" because that's all she knew how to say. Serena's mother even claimed she was Serena's little sister. She learned how to mimic others, and got in troublesome situations at times. The Sailor Senshi usually had to rescue her. She also saves the Senshi sometimes. She's just your normal child, only much cuter.