Okada Nizou (岡田 似蔵), also known as Nizou the Butcher, or Manslayer Nizou (Hito Kiri Nizou) was a blind assassin and a master of Iai jutsu, which are techniques for drawing a sword. He was a member of the Kiheitai, an extremist Joui faction bent on causing world destruction, and would become fused with the Benizakura bio-mechanical sword, which would ultimately take over his body completely and lead to his defeat. He is the main antagonist of the Infant Strife Arc and Benizakura Arc