Kaidou of the Beasts, renowned as the world's "Strongest Creature", is the Governor-General of the Beasts Pirates and was formerly one of the Four Emperors that ruled over the New World. He is also the father of Yamato. Once a promising child soldier at the service of the Vodka Kingdom decades ago, Kaidou was drafted against his will by the Marines but managed to escape and start a career in piracy. He was invited by Edward Newgate to join the legendary Rocks Pirates as an apprentice.