Kazu set out to sea, gathered Carlmand and Makino as crewmates, and gained a reputation through clashes with Shanks, the Marines, and Dragon. After sharing revolutionary plans with Dragon, Kazu’s crew stopped at Airmus Island, where Kazu began forming a plan to help Carlmand avoid recognition.
Kazu recruited Behrens and Robin while clashing with Smoker and Aokiji in Loguetown, then openly defied the World Government by destroying a Celestial Dragon’s ship. After laying low and growing stronger, the crew reached Alabasta, where Crocodile confronted Kazu.
Kazu secured Whitebeard’s agreement to meet him, earned Alabasta’s trust, and led his crew to Sky Island, where Behrens gained the Rumble-Rumble Fruit and Robin found a Poneglyph. In Water 7, Kazu commissioned a grand new ship from Iceburg and settled the crew in for a year of training while it was built.
Kazu and the Blond Hair Pirates took their new ship from Water 7, toppled Saierde’s rulers, and gained Drew and Hancock as allies. At Sabaody, the crew split up while Kazu began a sword fight with Maidel Oulait that remained unresolved.
After killing Saint Charlos and crossing the Red Line, Kazu led the Blond Hair Pirates into Whitebeard's territory and challenged Whitebeard over Her Navia's last wish. The arc left Kazu and Whitebeard battling while their crews began fighting around them.
Kazu defeated Whitebeard, became his son, and helped cure his illness before leading the Blond Hair Pirates through Alchemi and Cocoyasi Village. News of his strength spread, drawing the attention of the Marines, Big Mom’s crew, Doflamingo, and Law as the Divine Dragon sailed toward new destinations.
Kazu welcomed Law into the Blond Hair Pirates and brought him to Dressrosa to help bring down Doflamingo. Law killed Doflamingo for Corazon, and the arc ended with Viola warning Kazu about Sugar’s ability and the surviving officers’ revenge.
After restoring Dressrosa, Kazu led the Blond Hair Pirates to Totto Land, where a tea party erupted into battle with Big Mom’s crew. He defeated Big Mom, brought Galette aboard, and took a Road Poneglyph as the crew sailed on under new wanted posters.
Kazu awakened the Spacetime Divine Dragon’s powers, defeated Garp, and helped Tesoro join the Revolutionary Army. After leaving Kentron, the Blond Hair Pirates reached Zou and began making contact with its inhabitants.
Kazu secured Zou’s and Fish-Man Island’s Road Poneglyphs, then brought the Blond Hair Pirates to Wano. After killing Orochi and crushing his revenge against Hiyori, Kazu faced Queen and let Carlmand claim the fight.
Kazu defeated Kaido, recruited Yamato, and led the Blond Hair Pirates to Laugh Tale, where they learned the hidden history and announced their success to the world. The Five Elders plotted to destroy them, while Kazu joined Whitebeard for New Year and evolved his Conqueror’s Haki into Emperor’s Haki.
Kazu recruited Reiju, then joined Whitebeard in a battle that destroyed the World Government’s expedition and killed the Five Elders, the Holy Knights, and Saint Garling. The Marines began considering an alliance with the Revolutionary Army, while Kazu’s crew reached Swallow Island to reunite with Law’s friends.
Kazu joined Dragon and Shanks in attacking Mary Geoise, defeated Imu, and helped bring down the World Government. He then took control of the Goa Kingdom, transformed it into the Huaxia Empire, and used his evolved powers to intervene in wartime China before returning to his companions.