Musashi Miyamoto is a major character in the anime Yaiba: Samurai Legend, portrayed as the legendary historical samurai from the early Edo period who, contrary to historical records, is still alive and over four hundred years old. In his youth, Musashi was a tall and handsome swordsman who won more than sixty duels, but in his present age he appears as a diminutive old man with long, antenna-like eyebrows, a hunched frame, and a comically fragile physique prone to back spasms and a weak hip. He has been guarding the sacred Raijin-ken for centuries, and when the young protagonist Yaiba Kurogane manages to pull the sword from its stone, Musashi takes on the role of his master. His personality is marked by a sharp contrast: he is a more responsible and less lenient teacher than Yaiba’s own father, yet he shares the same gluttonous, lecherous, and mischievous tendencies that define the boy. His signature laugh is a high-pitched, wheezing Hyo~hyohyohyo. His combat ability remains extraordinary despite his age, and he is a master of the Niten Ichi-ryu style, also known as the Two Sword Style, a technique he developed in his legendary past. His appearance has changed so drastically over the centuries that his old rival Kojiro Sasaki and former pupil Jubei Yagyu fail to recognize him when they are revived. Musashi’s motivations center on his duty to guard the Raijin-ken and to train Yaiba into a worthy samurai capable of facing the demonic threat posed by Takeshi Onimaru. He maintains a teasing, sometimes exasperated relationship with Sayaka Mine’s grandmother, Fuji Mine, who calls him a perverted old man, and he often refers to those around him with nicknames such as calling Gerozaemon a stupid frog. Over the course of the story, Musashi provides both comic relief and moments of genuine wisdom, showing a softer side when his past is glimpsed in flashbacks, and he evolves from a cryptic hermit into a mentor who genuinely cares for his student’s growth. His notable abilities include his phenomenal reflexes, his two-sword fighting technique, and a lifetime of dueling experience, but his effectiveness is tempered by his aged body’s physical limitations.