He is voiced by Yū Mizushima.
Kawamatsu has undying loyalty to the Kozuki Clan and fellow retainers as he will never submit himself into the likes of his enemies such as Kaido and Orochi even when Orochi force feed him a poison fish everyday. He is respectful for Luffy when he spat a bone from a poison fish that he eaten to one of the guards. He entrusted Luffy to protect Hyogoro as they need him.
He loves sumo wrestling.
Abilities and Powers
As a fishman, Kawamatsu is 10 times stronger than humans.
Kawamatsu is renowned to be known as Kappa-Ryu which he holds tremendous talents in his swordsmanship.
Kawamatsu has a strong will as he will never submit himself to the likes of his enemies such as Kaido and Orochi even when fed him a poison fish by Orochi everyday after captured him 13 years ago. He is determined to still be loyal to the Nine Red Scabbards after suffering a great loss to both Kaido and Orochi, getting separated from Kozuki Hiyori, and being kept in solitary confinement for 13 years. He is determined to stick by his allies and to trust that they can help him and Wano Country.
Kawamatsu has a good talent of marksmanship and great accuracy when he spat a bone from the poisoned fish he ate to one of the guards in Udon that attempted to attack Luffy.
Kawamatsu has mastery of Busoshoku Haki to bypass Devil Fruit users including Logia type users.
Devil Fruit Users