Marduk, because is a mofuggin' BEAST. Gator Slamming fools so hard that they would go crying to their moms, except they CAN'T because Marduk just broke all of their bones.
I've liked Nina Williams right since the first game - she's just a cool and powerful woman and an awesome fighter. Who says blondes are dumb?! Her relationship with her sister Anna also reminds me of my sister and myself (though we are perhaps slightly less violent with each other..!).