Arc 5Clash with Whitebeard
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 killed Saint Charlos at the auction house, then fought Kizaru and escaped with the Blond Hair Pirates.
- Kazu recruited the injured Oulait, carved a passage through the Red Line, and became known as the fourth Emperor of the Sea.
- The Blond Hair Pirates visited Mukelong, where Kazu revealed that Whitebeard was his father and planned to settle the debt owed to Her Navia.
- Kazu gave the Chilly-Chilly Fruit to Carlmand and the Medicine-Medicine Fruit to Makino, then challenged Whitebeard to meet him at Broken Stone Island.
- Whitebeard attacked Kazu, who countered with Haki and spatial power and injured him before the two clashed again.
- Kazu and Whitebeard learned that their Devil Fruit powers interfered with one another as their duel continued.
- Oulait fought Vista, Behrens fought Marco, and Carlmand created an ice battlefield that Whitebeard's tremors repeatedly shattered.