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He was impatient in his youth which made susceptible to Muramasa's evil. As the generations had passed, he was wise enough to be thankful upon being freed from the evil within the sword.
During Ancient Japan, he went to Masamune, a great swordsmith, for a great sword. But this would take time, so he was tricked into getting one made by Muramasa, who's evil went into the Sword of Doom, which then possessed him. His spirit was then defeated and imprisoned within the sword and hidden away by the Green Dragon who had the Sword of Fate.
Scooby-Doo! and the Samurai Sword
Miss Mirimoto and Sojo freed the Black Samurai, which spelled the end of the world, but Scooby-Doo & Shaggy Rogers used the Green Dragon's sword to defeat him again. Scooby-Doo then destroyed the Sword of Doom, which freed the now rapidly aged ronin. He thanked everyone for saving him and the world, naming Scooby a legendary samurai before dying in peace and fading away.
- As he only speaks as an old man, he's credited as "Old Man Samurai."
- A ronin is a samurai without a master.