One Piece: From the Start, I Ate the Mythical Zoan Godzilla Fruit

Arthur transmigrates into the world of pirates as a prince of a fallen kingdom, about to be sold into slavery by the World Government. Just then, he binds to a System and eats the Godzilla Fruit from the start. As long as he completes missions, he can evolve without limit. Godzilla is the King of the Monsters. He is also a king born to maintain the balance of nature! In Arthur's eyes, the Marines, the World Government, and the pirates are all forces disrupting the balance of these seas. So he swears to restore the natural balance of the ocean. And so, a King of the Monsters feared by all is born! Burning Godzilla, Godzilla Ultima, Godzilla Earth... [Fan fiction + Godzilla + monsters + pirates]