Mystery of "Chibi Miku / Small Miku"
She in Miku Miku Dance is a scale-down model of Miku.
She is a younger sister of Miku?
She doesn't live with Miku in original comic "Chibi Miku-san".
Chibi Miku lives in the house of Kagamine family.
It appears in Miku only between 196-200 stories of "Chibi Miku-san".
Miku is like mother that is working in another place.
No do be known whether ...
"Chibi Miku" is possibly a daughter of Miku? http://carafuru.web.fc2.com/