How Could I, a Mighty Celestial Dragon, Be a Pirate?

Many years later, facing the naval encirclement and suppression, Ian will recall the night he ate the Devil Fruit and the title he gave himself on a whim that day. When Akainu Sakaski stood on the naval warship, he yelled at him: "Ptolemy, the 'astrologer' with a bounty of two billion! Your fleet has been surrounded! Let's capture him without mercy!" Ian sneered, and then asked: "What are you talking about? How can I, the mighty Celestial Dragon, Don Quixote Ian Saint, be a pirate?"