This paper toy is a chibi Hachune Miku, recognized as a famous official derivative of Hatsune Miku, the papercraft created by smilerobinson. Hachune Miku is a mispronunciation of Hatsune, which shows her childishness and generally silly disposition. She is often seen in videos as a blank-eyed doll-like figure with a gaping mouth. More information at wikia.
You can download the paper craft toy here: Vocaloid - Chibi Hachune Miku Free Paper Toy Download