Sekiro

Sekiro, also known as Wolf, or Okami, is the eponymous protagonist of Sekiro: Shadows Die Twice. He is a Shinobi serving the Divine Heir, Kuro. Bound by honour, he is composed and reticent, but also has the ruthlessness to complete his mission by any means necessary.

Bio
Sekiro is an older ninja bound to protect The Divine Heir, the last scion of an ancient bloodline. Ambushed while escorting his charge through a war-torn province, Wolf is attacked by a young samurai commander, costing him his left arm, his master's safety, and his honor. Waking up, and having found his arm replaced by a "ninja prosthetic", Wolf is told his master still lives, and that he still has the chance to redeem himself by preventing the samurai from sacrificing his liege to obtain immortality.

Personality
Sekiro is not only hellbent on getting revenge, but he has no qualms with murdering defenseless old women to remain undetected, and as expected of a ninja, using pragmatic tactics that would be considered very dishonorable. That being said, he's quite noble and pleasant otherwise, being respectful to everyone he meets and, in turn, being treated nicely by his comrades.