Jukko. Not only is he a great fighter, but he's great without any physical powers. No added strength or speed or anything, just hard work, muscle, skill and intelligence. His only power is an uncontrollable ability to feel the pain of anyone and everyone within a mile of him, so he feels exactly what the people he kills feel. You'd think that would stop him from handing out beatdowns left and right, but it doesn't. He single-handedly took down Midnighter. He cheated, but it's still worth a mention.
Don't have time to scan a picture, so this is the best I can give you. He's the bald guy.
I'm going through Nextwave (looking for funny pictures of Aaron Stack) and I'm seeing a lot of Elsa Bloodstone. She's definitely a "cool lesser-known scapper". I think she has the majority of the ass kicking moments (and the most bizarre ones) in Nextwave.