Ryu Hayabusa, the guy is a freaking badass. He's got incredible fighting abilities, amazing ninja skills, seems to be familiar with variety of melee weapons. I want to say he has enhanced senses as well. I mean, anything and everything I know are mainly from playing Dead or Alive and Ninja Gaiden. But if I was to choose my favorite ninja, hands down, it would be Gray Fox. I like his back story so much more and I feel there's more to him. Plus, who doesn't like Cybernetic Ninjas? lol