This cube craft paper model is the SkullGreymon, based on the anime, manga and video games series "Digimon". The papercraft is designed by blackignus. SkullGreymon is a Skeleton Digimon whose name and design are derived from "Skull Greymon". It was a Digimon that put too much importance on fighting, and as a result of its combat instinct it clung to life despite its body rotting away, its whole body becoming nothing but bones. As it doesn't have even a scrap of intelligence to balance its combat instinct, its existence is a threat to other Digimon.
Digimon, short for "Digital Monsters", is a Japanese media franchise encompassing digital toys, anime, manga and video games. The franchise's eponymous creatures are monsters of various forms living in a "Digital World", a parallel universe that originated from Earth's various communication networks.
You can download this cube paper craft toy from here: Digimon - SkullGreymon Cube Craft Free Paper Toy Download