This cube craft paper toy is the Sabo, based on the manga / anime series One Piece, this papercraft was designed by Sery0da. There is another version of the Sabo paper toy here: The One Piece – Sabo Free Cube Craft Paper Toy.
Sabo was a childhood friend of Portgas D. Ace, and eventually Monkey D. Luffy, to the point where the three considered themselves to be “brothers”. He was born into a noble family, but decided to run away and live in the Gray Terminal, eventually setting out to sea on his own.
You can download this cube papercraft here: One Piece - Sabo Ver.2 Cube Craft Free Paper Craft Download