This avengers papercraft is designed by Xavier. There are others Black Widow paper crafts at the site: "The Avengers – Black Widow", "The Avengers – Hawkeye and Black Widow" and "The Avengers – Black Widow Mini Papercraft".
Black Widow, also known as Natasha Romanoff, is a fictional character in the Marvel Comics Universe. She was created by editor and plotter Stan Lee, scripter Don Rico and artist Don Heck, and first appeared in Tales of Suspense No. 52. The Black Widow was played by Scarlett Johansson in the 2010 motion picture Iron Man 2 and 2012 motion picture The Avengers.
You can download this avengers paper craft from here: The Avengers - Black Widow New Version Free Papercraft Download