I know its going a lil oldschool, But I think Gutz from Sword of the Berserk was pretty Shweet! First off he has a HUGE friggin sword that cleaves all things in two. It's a great hack and slash character that left bloody halfs of enemies on the ground. Second is that when he is constantly hacking...his beserk meter rises until He goe beserk and turns the screen red....then He cant be harmed while he hacks and slashes making the character more awesome cuz he crazy and invincible. Fourth, He was cursed by the gods, so he's in constant pain ALL THE TIME. And yet he surmounts the strength to wipe his world clean of all the evil that is ruining it. Thirdly, He's the Hero, so he is gonna win against any kind of evil no matter what. Villains always lose to the hero making all heroes more badass than any villain. Lastly, the end boss that he faces is a giant minotaur looking thing with wings, that is insanely hard to beat. How bada** do you have to be to have an enemy that is insanely huge and as bad as the main character. anyway...thats my submission.
Not to mention he meets all the criteria of a badass.....scar, weapons, eyes, etc.