XD. I have no idea who that guy is. :P But I think he's from star wars, all I can tell. (Not really :P) I more thought of sev as a loose bit of code when I first saw his profile picture. :P
If you read the Republic Commando books by Karen Traviss (GREAT author, did Halo & Gears Of War books) you'll get to know more about him
Basically, this is from memory, he was one of the finest clones ever made. Sniper, part of Alpha squad. K/MIA on Kashyyyk
I still have a bare idea. XD And I'm less interested in game/movie based books, I'm more likely reading books that are books, no more and no less.
I hate movies adapted to books.