Not content with letting us play as Solid Snake on PictoChat levels, the developers of Super Smash Bros. Brawl have revealed that we can have Metal Gear Solid's Grey Fox as an Assist Trophy. (Or "Gray Fox" if you're American, which is fine now because we've had our diversity training.)
Assist Trophies aid the main characters (like MGS' Solid Snake, obviously) but aren't actually playable. Unless they're teasing us. You can see Grey Fox swinging and slicing around the screen in this week's bundle of screenshots.
Here's some peculiar text from the official website to sum up his role: "He approaches stealthily with lithe jumps, coming right in then slicing repeatedly. Awww! It makes you want to use him as a playable character." "By the way, he reflects projectiles." "Gray Fox, who engaged in a grand battle to the death with Metal Gear REX... To think that he would reappear on Wii, and alongside Mario and Sonic at that! You never know what might happen in this world."