I honestly don't know. There are so many awesome ones. The Grey Wardens, the Spectres, the Jedi Council, the Grey Knights, Uplink Corp., Task Force, the Psychonauts, the Brotherhood of Steel, the Assassins, the Argent Crusade, the Lanterns, the League of Evil (one of them HAS to be awesome), the State Alchemists, the Circle/Council of Magi (which one does not matter. They are fucking magic), the Autobots, the Men in Black, Power Rangers, X-Men.. (an hour later)..The Holy Orders of the Emperor's Inquisition, the Agency, SPEHSS MAHREENS other than the Grey Knights, the Blood Knights, the family Aratholl and last but certainly not least, the fucking Guys
Woah. Not all of those are incredibly badass, but quite a few are.
I'd have to pick to be a Guy. There can only be one, but every single one is the most badass ************ of a generation.
(On that note, I'm ALMOST done beating the Guy. He's hard as hell ._.)