Shimotsuki Ryuma, One Piece Wiki

Shimotsuki Ryuma was a legendary, world-famous samurai hailing from the Shimotsuki Family of Wano Country, who lived during Wano's "Country of Gold" era centuries ago. He was revered for his mastery of swordsmanship that earned him the title Sword God, as well as his feat of slaying a dragon. He is also the direct ancestor of Shimotsuki Ushimaru and Roronoa Zoro. 23 years before the current storyline, Ryuma's consecrated grave in Ringo was ransacked and his corpse and sword stolen by Gecko Moria

I drew Zoro and Ryuma(from Monsters) : r/OnePiece

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Shimotsuki Ryuma Legendary Samurai of Wano by bodskih on DeviantArt

Explaining Shimotsuki Ryuma Haki, Power and Abilities

Shimotsuki Ryuma by efrain0793 on DeviantArt

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