Saizo Hattori is a ninja who is a sociopath, and makes attempts to try and become a more socially acceptable person through the series. He often has a habit of wearing his helmet and mask to avoid contact with people, and speaks in a code language called "popapepa" so they won't know what he's saying.
His cousin is Takumi Hattori, who debuted in the latest game in the series, Gouketsuji Ichizoku Matsuri Senzo Kuyou.
