I! the Royal Mate of the Whitebeard Pirates!

My name is William, I traveled to the world of pirates, and activated the Xuye Palace system when I was five years old. When I was twenty-three years old, with my own efforts, I not only possessed the power of Ulquiorra, but also captured a kingdom and became prosperous in the pirate world. However, when I was twenty-three years old, the Beast Pirates attacked me, and all the wealth I had accumulated for many years was lost in a bloody battle. Just when I was desperate, Whitebeard came. Whitebeard attacked Kaido and invited me to become his deputy. Then, I was wanted by the Warring States Period in the name of the 'Emperor' with a bounty of 3 billion on my head. "In my name, William, I grant you equal destruction!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.