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Miyamoto Musashi, the legendary swordsman and ronin, is the character portrayed by Mifune in the final installment of the Samurai Trilogy, "Samurai III: Duel at Ganryu Island." This epic samurai drama follows Musashi as he faces his ultimate challenge, a fierce duel on the remote island of Ganryu, where he must confront his past and prove his mastery of the sword.