For me? Seto; Nanaki's (Red XIII) father.
Why? A few reasons, really. The scene that Nanaki learned the truth was...actually one of the most heart wrenching moments in the game (The only one, probably...). Selflessly giving his life in an attempt to save his tribe and family, lying to his son so that said son wouldn't throw himself at the enemy in an attempt at revenge...
That is a true show of bravery.
Why? A few reasons, really. The scene that Nanaki learned the truth was...actually one of the most heart wrenching moments in the game (The only one, probably...). Selflessly giving his life in an attempt to save his tribe and family, lying to his son so that said son wouldn't throw himself at the enemy in an attempt at revenge...
That is a true show of bravery.