Ononoki Yotsugi is one of the characters in Bakemonogatari series.
Yotsugi is a corpse or a shikigami. She was ressurected by an occult club for a project and later abandoned.
She then lives in araragi house as a doll and protect koyomi araragi.
There are a lot more backstory on her but I don’t feel like writing it here. I’ve stop watching Bakemono series after season 2.
Too much words.. I hate watching anime with lots of words to read.
As for her paper craft she requires 2 sheets of papers to build. Assembling should be medium hard and it comes in .PDO only.