Silent, cold and deadly. Ryu has the traits of a ninja and then some. Visually his design is fairly simple, and yet it has a certain touch to it that brings it out. I love the fact that he does not really speak, it just adds to his awesomeness and really allows him to get the drop on his opponents.
Ryu lets his actions do the talking for him, when it comes time for fighting he's on his A game and rarely does anyone best him in battle. He's comes from the franchises known as Ninja Gaiden and Dead or Alive fighting video game franchise. Hopefully somewhere down the line he'll get anime movie or something cause he really deserves it.
He's not completely human though, which considering his outstanding abilities should come as no surprise. If you want to know more about Ryu check out his wiki page here http://en.wikipedia.org/wiki/Ryu_Hayabusa