Yagyu Sekishusai

Leader of the Tokugawa clan and master of the Shinkage-ryū fighting style.He Holds Musashi off with a backscratcher while bedridden and completely saps Musashi of his will to fight without even being fully conscious at the time, the encounter turns into a learning experience for Musashi, who is awed by the spiritual power of Munetoshi, and makes him aware of his shortcomings as a person.