Sabato Kuroi

Skilled pupil of Anotsu Saburō (Anotsu Kagehisa's grandfather) and master Ittō-ryū swordsman. Along with his skills with a sword, Kuroi has several quirks, which includes poetry referencing Black Sabbath appearing whenever he does. In addition, Kuroi is so obsessed with ageless beauty that he used taxidermy to preserve the heads of his former wife and Rin's mother, and mounted them on his shoulders. Along with his sword skills, Kuroi uses two shuriken referred to as Karasu, or "The Crow." He first appears in Conquest part 1 and is later killed by Manji in Conquest part 3. Kuroi Sabato's is inspired by the band Black Sabbath; Kuroi Sabato roughly translates into Black Sabbath from Japanese.

Kuroi is a direct translation to the color black. Sabato when romanized, can be taken as "Sabbath." Black Sabbath is one of Hiroaki Samura's favorite bands. (Source: Wikipedia)