One Piece Specials is an ongoing anime series that started in 1999. So far 21 episodes of One Piece Specials have been aired. With a total of 8 reported filler episodes, One Piece Specials has a moderate filler percentage of 38%. Monkey. D. Luffy refuses to let anyone or anything stand in the way of his quest to become the king of all pirates. With a course charted for the treacherous waters of the Grand Line and beyond, this is one captain who'll never give up until he's claimed the greatest treasure on Earth: the Legendary One Piece!