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Kawamatsu
Kawamatsu was a powerful samurai who served under the Kozuki Family. He was captured by Kaido and imprisoned in Udon Prison for 13 years. During his time in prison, he became friends with the other prisoners, including Hyogoro and Raizo.
When Luffy and the Straw Hat Pirates arrived at Udon Prison, Kawamatsu helped them escape. He then joined the Straw Hats in their fight against Kaido. In the battle, Kawamatsu fought bravely and helped to defeat Kaido's forces.
After the battle, Kawamatsu returned to Wano Country and reunited with his family. He is now a loyal retainer of the Kozuki Family and is helping to rebuild Wano Country.