This SSBB papercraft is the Gray Fox. This paper model is designed by Corbak. Gray Fox (real name Frank Jaeger) is a major character from the Metal Gear series, who has appeared since the original Metal Gear, until his death in Metal Gear Solid. In Metal Gear Solid, he is voiced by Greg Eagles. However, Rob Paulsen voiced Gray Fox in Metal Gear Solid: The Twin Snakes, the Gamecube remake of Metal Gear Solid, as well as for Super Smash Bros. Brawl.
You can download this SSBB paper model from here: Super Smash Bros. Brawl (SSBB) - Gray Fox Free Papercraft Download