Kaido (カイドウ, Kaidō?) is one of the Four Emperors. Not much is known about Kaido’s personality, but he appears to be a ruthless warrior, slaying Gecko Moria‘s entire crew ten years ago and was planning to attack Whitebeard during the latter’s attempt to save Ace from execution. As one of the Four Emperors, Kaido is one of the strongest pirates in the world. He attempted to take Whitebeard’s life, which is something that few would dare, and managed to clash with Shanks. He also once fought on equal grounds against the Warlord, Moria, until he somehow gained the upper hand and became victorious.