Kasane Teto is a voice synthesizer character just like Hatsune Miko. Kasane is from UTAU, a shareware version of Vocaloid program.
Kasane originally created as a troll “VOCALOID” by fans. Her surname Kasane literally means “heavy sound” or “overlapped sound”.
According to wiki, Kasane is not Vocaloid but many assume she is. Her voicebank is only used for UTAU .
Her paper craft requires 12 sheets of paper. I think to build this is not as easy as it seems. You’ll understand once you see the templates.
I don’t know who made this but it is based on Nendoroid model of Kasane Teto.