Can be a man or a woman. Try to post a pic and list why you like them, or what they've done that secures them a place in the Halls of Bad-Assery. Yes, the Halls of Bad-Assery are a real thing, or at least they should be. Here's one of my favorite: Ellen Ripley from the Alien films.
To me, Ripley is one of the strongest female characters ever created. She's not just physically tough; her mind and will are like steel. See Ripley isn't some unrealistic flawless character who goes in and blasts the shit out of everything without a second thought, she's scared out of her mind to be surrounded by the most dangerous, violent creatures in space. When the orphan she's chosen to take care of is kidnapped by Xenomorphs to be turned into another biological factory for their kind, she duct tapes a flame thrower to a machine gun and marches right into the Queens lair to retrieve the child. At no point does the fear leave her; horrifyingly painful death awaits her around every corner, and yet she still finds the courage to press forward. Courage is not a lack of fear, it's choosing to do what you must
in spite of fear.
After the Xenomorph queen finds it's way onto her ship and traps the child beneath some metal grating, she jumps into a fucking robotic suit of armor and engages the 20 foot tall menace in melee combat. Looking terror incarnate directly in the face as it struggles to rip her to pieces, she finally vanquishes the queen by sending it out the airlock. This chick is hardcore.
I think Ripley personifies both strength and courage, and for that I propose that she be allowed to enter the Halls of Bad-Assery.
Who do you think is a total bad ass?
Edit: Ah, yeah it can be evil bad asses too. Anyone that qualifies as someone you don't want to mess with. In fact, you can use any definition of bad ass that you want :P