There are so many fantastic words out there that describe this character. Pick just a few and write them here! (Prizes for the one who can make the longest sentence about Six, with good words)
Six is... a genetically engineered, humour-less, powerful, strong, fast, fantastic, unpredictable deck agent superhuman with the power to blow Chaosonic's mind, Evil's brain, and all the shadows off planet Earth.
Well, I may be exaggerating a little there, but hey-this is a fansite, I can say what I want! (As long as it's positive. :D )