The “D” in Monkey D Luffy stands for “Dawson”, which is the family name of the main character of the popular manga and anime series, “One Piece”. Luffy is a spirited, ambitious, and resilient pirate captain who dreams of finding the world’s ultimate treasure, known as the One Piece. He is the leader of the Straw Hat Pirates, and is well known for his rubber-like physique, as well as his ability to stretch and manipulate his body in unusual ways.