Sigmas dog was annoying. Sigma was astoundingly easy as he had such a simple pattern. Sigma's head/ robot wall was a night made before I learned the pattern.
To me its the opposite. I absolutley hate it when I wall jump away from him and he jumps to exactly where I am. Then i jump away to a wall again and boom he jumps with me as well. I can never beat the game by myself. I make my friend do the hadoken for me since i can't do it.