Kaidou Kaidou, also known simply as Kaidou, is one of the Four Emperors in the anime and manga series One Piece. He is the captain of the Beasts Pirates and is renowned as the 'Strongest Creature in the World'. Kaidou is a major antagonist during the Wano Country Arc, playing a pivotal role in the conflict with the Straw Hat Pirates and their allies. His immense strength, resilience, and ability to transform into a dragon make him one of the most formidable foes in the series.