Kaidou

Kaidou of the Beasts, renowned as the world's "Strongest Creature", is the Governor-General of the Beasts Pirates and one of the Four Emperors ruling over the New World. He is also the father of Yamato. Kaidou was born somewhere on the Grand Line 59 years ago. Over 40 years ago, Kaidou joined the Rocks Pirates as an apprentice. 38 years ago, the Rocks Pirates clashed with Gol D. Roger and Monkey D. Garp on God Valley and were defeated, resulting in the crew disbanding. On the day the Rocks Pirates fell, his crewmate Charlotte Linlin gave the Uo Uo no Mi, Model: Seiryu to Kaidou, putting him in her debt, which she considered to be a lifelong one. Since becoming a pirate, he had been defeated seven times and captured eighteen times by the Marines and the other members of the Four Emperors. In one of those occasions where he had been arrested, Dr. Vegapunk was able to extract a sample of Kaidou's Lineage Factor, allowing the scientist to replicate his Devil Fruit, although the results were noted to be unsatisfactory.

At least 33 years ago, Kaidou started recruiting his crew. During this time, Kaidou encountered a young boy named Alber, who was hold captive at and experimented on Punk Hazard by the World Government. After freeing him and demolishing the facility, Kaidou recruited Alber, noticing his extraordinary strength due to his background as a Lunarian, gave him his epithet "King" and made him his first-hand man. Kaidou was not recognized as one of the top pirates in the world until around the time when Roger was executed. He, along with Shanks, then joined Whitebeard and Big Mom among the ranks of the Four Emperors. Kaidou began to emphasize how useful Yamato will be to his future arsenal. After Yamato attacked him in her hybrid form, Kaidou revealed that he went through great troubles to obtain her devil fruit, but he never intended on her eating her eat it. The father and daughter pair then faced each other in both of their hybrid forms. He began to further stress how incredibly valuable her fruit - the Inu Inu no Mi, Model: Okuchi no Nakami - was, and that it was a shame to let a wannabe Oden eat it. While he exchanged more swings with Yamato, he claimed that the devil fruit was the guardian deity of Wano, so Yamato will have to protect Wano for Kaidou. As she rejected the idea, Kaidou indicated that even though Orochi was Wano's tyrant, he still transformed the country into a weapons factory, a favorable action for Kaidou. As Kaidou rejected the idea of Yamato helping the samurai and freeing Wano, he attacked his daughter with Bolo Breath, which clashed with her own icy breath, creating a swirl between them. Momonosuke bites Kaido after conquering his fear. After fighting for some time, Kaidou attacked his daughter with powerful flying strikes. Kaidou then confirmed that he was attacking Yamato with the intent to kill her. He said that because she bore the heavy burden of calling herself Oden, she must be prepared for an all-out war and not just a family squabble. After Yamato confronted him over why he stole Yamato's as well as Wano's freedom, he declared that there were no easy answers in this world. Then, they both attacked each other with Raimei Hakke, creating a clash of advanced Haoshoku. As soon as Yamato's Kagimiyama cracked, they both repeatedly struck at each other with their Kanabo's, with Kaidou expressing that Yamato's attempts at gaining friends and allies were all in vain, due to her origin as his child before gaining the upper hand and furiously striking at her with his Kanabo. When Luffy and Momnosuke appeared in the sky above Onigashima, Kaidou was struck by a simultaneous punch from both Luffy and Yamato, forcing him to turn into his dragon form, being amused by their attacks while also expressing his surprise at Momnosuke's adult dragon form and explaining that the world does not need two dragons. When his Boro Breath was dodged by Momonosuke, he was punched by Luffy with a Gomu Gomu: King Kong Gun, then followed by Momonosuke biting him in his torso, resulting in him expressing pain. Before he could counterattack, he was once again hit by Luffy and decided to transform into his Hybrid-Form. Both then infused their Haki and attacked each other, creating another clash of Advanced Haki, which even split the sky above Onigashima, revealing the full moon previously hidden. After the clash cooled off, Kaidou then turned his attention to Momonosuke, who was afraid of the height he was experiencing, attempting to finish him off for good this time, only to be blocked by Yamato again and soon afterwards by Luffy, who held him strain with his legs and asked Yamato to leave Kaidou to him. As the island was approaching the Capital, Kaidou's Flame Clouds were losing their power, leaving the island slowly crumbling, and both Kaidou and Luffy continued to clash with each other.