Kaku

Kaku is a member of CP0. Prior to being instated into CP0, he was a member of CP9, operating undercover in order to obtain the Pluton blueprints from Iceburg. While undercover, he acted as one of the five foremen of Galley-La Company's Dock One, specializing in mechanics, diagnostics, and housecalls. After CP9's defeat at the hands of the Straw Hat Pirates, he and the rest of CP9 were dismissed by Spandam. For unexplained reasons, he was later reinstated and promoted to CP0. At some point after Kaidou's defeat, Kaku, Lucci and Stussy continued to Egghead by mission of the World Government to eliminate Vegapunk and his six satellites.

 

When they reached Egghead, Kaku pointed out that they, in addition to kill Vegapunk, could also eliminate Jewelry Bonney for the trouble she caused. However, they were denied access to the island, simply being told to drop their Seraphim and then leave. Kaku tried to reason with Pythagoras for still getting access to the island, but after being repeatedly denied access, Lucci decided to abandon the ship and have the whole CP0-group being teleported onto Egghead by their Seraphim unit, S-Bear. After arriving on Egghead, Kaku got enthusiastic about exploring Egghead, stating he never fought things which could be seen on Egghead. However, his enthusiasm got himself harmed, as he was not aware of Punk Records' protective measures against enemies and got blown up in an explosion by its shield, though he remained mostly unharmed and scoffed at Stussy for withholding important information from them about Egghead's unique features. Later, when Luffy's group were about to make their way to the Laboratory, the CP0-group and Luffy's group met. Later, Kaku was with Rob Lucci and Stussy after they had gained control of the Seraphim from Sentomaru. When discussing the dome, Kaku remarked how its defense systems were not to be trifled with. Once the dome opened up, Kaku and the others made their way up to it using Geppo. When Stussy pointed out the Thousand Sunny and Lucci proposed they destroy it, Kaku eagerly agreed and tried to attack with his Rankyaku: Amane Dachi. However, he failed to account for Zoro, who was asleep on the deck and blocked the attack. The two then engaged in battle. During the fight, Kaku revealed that he had awakened his Devil Fruit, but was still unable to gain the upper hand on Zoro. Suddenly, Stussy bit Kaku's neck, causing him to fall unconscious.