時雨

Like Rekka, Shigure is another enemy shinobi who opposes the protagonist. Stoic and aloof, he conducts himself in a manner true to his profession and believes death is the only punishment for failure. Since he is one of Rekka's childhood friends, he can read his friend's emotional state better than others. 

-Koei wiki http://koei.wikia.com/wiki/Geten_no_Hana