This Loki mini papercraft has a removable helmet, it is designed by Gus Santome. Loki is a fictional character, a supervillain that appears in publications by Marvel Comics. He is the adoptive brother and archenemy of Thor. He is based on the being of the same name from Norse mythology. The character first appeared in Venus #6 and was created by writer Stan Lee, scripter Larry Lieber, and penciller Jack Kirby.
Gus Santome has designed Avengers Mini Papercraft series, all of paper toys in this style:
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Tom Hiddleston portrays Loki in both the 2011 superhero film, Thor, and in the 2012 film, The Avengers, as the primary antagonist of both films. In 2009, Loki was ranked as IGN's 8th Greatest Comic Book Villain of All Time.
You can download this mini paper toy from here: The Avengers - Loki Mini Papercraft Free Download