Sengo Muramasa

Sengo Muramasa is an alternate protagonist in Kingdom Hearts: Arcana. He is probably older than Nathaniel Koroshiya, though it isn't certain, since he only began keeping track around 950 years ago. Unlike Nathaniel, Muramasa cannot wield the Keyblade, but he does posess quite fearsome Hollow powers. The reason he has not been exiled from Soul Society is because he acquired them before his arrival. He recently found and adopted Naomi Reed.

Personality
Unlike his daughter, Sengo Muramasa is utterly ruthless, with no mercy in battle. His Zanapkuto, the name of which translates to "One Thousand Cold Nights", has the power to absorb heat and to induce fear throughout a certain area, which certainly fits, given how cold and terrifying Muramasa usually is. The Vizard generally only shows any degree of warmth around those who have earned his respect, such as Nathaniel Koroshiya, Kisuke Urahara, and Yoruichi Shihoin. The only exception thus far is Naomi Reed, whom he found bleeding in a back alley on Earth, and whom he then nursed back to health and adopted for reasons known only to himself.