Musashi Miyamoto, a 400-year-old samurai from the early Edo Period, defies historical accounts of his 1645 demise, enduring into the modern age. His weathered frame—diminutive, fragile, with elongated, antenna-like eyebrows—belies the striking youth of his past, a tall and handsome warrior now unrecognizable to former adversaries like Kojiro Sasaki and protégé Jubei Yagyu. As the guardian of the Raijin-ken, the Thunder God sword enshrined in stone, he trains worthy successors such as Yaiba Kurogane, who claims the blade. A mentor demanding discipline, he balances stern lessons with a gluttonous appetite and roguish charm, clashing frequently with Yaiba’s recklessness. Centuries of combat honed his dual-sword Niten Ichi-ryū style, a testament to his relentless refinement. His storied past includes legendary duels, notably slaying Kojiro Sasaki, only to face the resurrected swordsman anew. Though he adopted sons like Miyamoto Mikinosuke and Miyamoto Kurotaro, their bonds remain shrouded, while his ties to Jubei Yagyu evolve from rivalry to uneasy alliance under his guidance. Beyond mentorship, Musashi confronts supernatural foes: the demon Takeshi Onimaru and the celestial beast Yamata no Orochi. His tactical brilliance, sharpened over lifetimes, turns battles, compensating for aging joints with strategic cunning. In crossover escapades like *Detective Conan*’s *Conan vs. Kid vs. Yaiba*, he drolly dubs Kaitou Kid “Jirokichi the Rat Boy,” dispatching Yaiba on kite-bound chases—a blend of eccentricity and command. Haunted by guilt over Kojiro’s death, he grapples with past sins while upholding samurai ideals in a modern world. His signature cackle, “Hyo~hyohyohyo,” and taunting wit mask undiminished reflexes and peerless skill, proving even a withered shell can wield thunderous might.