Stick Figures
I'm not much in the animation department. But I know when I tried I usually had more than stick figures kicking the shit out of eachother. For the love of all that is good and holy use a picture or something. If you want to do something violent and fucked up at the same time, take a picture of your grandmother, cut and paste arms to her, give her fangs, and make her eat Godzilla or something. There's hundreds of sites for fighting stick figures and I never thought they were too great.