why does he wanna fight me so bad?
no seriously it's cool.
The pose is so energetic and quick, he looks like he's on some form of drugs / over-energetic / hyper. If this is the intent, GOOD! If not, I'd suggest slowing him down a bit. Like the smoke coming out of his back.
Pose is a bit akward. People tend to stand with one leg locked. Rarely with both knees bent.
Stop pixel shifting stuff. Actually redraw the frames. It results in fuller and smoother animation.
Also, I don't get why people always move the foot like you did. It just looks strange. Your feet don't move like that in real life when you're standing in place. Why would they here?