This paper toy is Captain Boomerang (George "Digger" Harkness or just Boomerang), a fictional supervillain who appears in American comic books published by DC Comics, the papercraft is created by Calvin Nicholas Lin.
He is an enemy of both Barry Allen and Wally West, who each hold the heroic mantle of the Flash. After Harkness is killed during the 2004 crossover Identity Crisis, his son, Owen Mercer (also known as Owen Harkness), takes over his father's mantle for a period of time until his death. Following the event of Blackest Night, Harkness returns to life and returns as Captain Boomerang. The George "Digger" Harkness incarnation of Captain Boomerang will be portrayed by Jai Courtney in the 2016 Suicide Squad film.
You can download this papercraft toy here: DC Comics: Suicide Squad - Captain Boomerang Free Paper Toy Download