Illyasviel von Einzbern is a character from Fate series. In all Fate series she is an enemy except Fate/kaleid liner PRISMA?ILLYA where she is instead the main heroine.
But during the Emiya Kiritsugu series, Illyasviel made affiliation with Saber to fight all the others servants.
Well I won’t list everything about her, you guys can read more about her in Fate Wiki pages.
As for her paper craft model, is published by www.imprime-recorta-pega.com . For some reason I couldn’t open the website.
I’m not sure if it’s my line or the website is down…
Illyasviel paper craft requires 3 sheets of paper to build.