Shimotsuki Kozaburo is a member of the Shimotsuki Family and a swordsmith who crafted the Great Grade Meito Wado Ichimonji and Enma. He was born in Wano Country, but illegally departed from there 55 years ago and eventually settled down in what became Shimotsuki Village in the East Blue. There he fathered a son named Koushirou making him the grandfather of Koushirou's deceased daughter Kuina.
All that has been seen of Kozaburo is a silhouetted profile of his head. He appears to have wild, spiky hair with a topknot, as well as a large nose. He wore a high-collared piece of clothing around his shoulders.
Abilities and Powers
According to Hitetsu, Kozaburo is a legendary master swordsmith whose craftmanship was known far and wide. His known masterpieces being two of the 21 Great Grade swords Wado Ichimonji and Enma, the latter which has the supernatural ability to absorb the wielder's Busoshoku Haki.
As a samurai of Wano, Kozaburo is a highly skilled in swordsmanship, having protected a village from bandits and trained them in swordsmanship.
Kozaburo forged the swords Wado Ichimonji and Enma, which were classified as Great Grade Meito. Fifty-five years ago, he illegally set out to sea. He eventually ended up in a village in the East Blue and helped save it from bandits. He fell in love with a woman while training the villagers in swordsmanship, and decided to stay in the village. Four years later, he fathered a son named Koushirou.
- Kozaburo's name has the same structure as his son Koushirou's, as both names begin with Kou and end with rou, and contain a number in the middle: zabu meaning three and shi meaning four.