A major theme in One Piece is dreams. It's the motivating factor of all the Straw Hat Pirates, bar none. Many minor characters have an arc regarding dreams they have or used to have. Nearly all the villians have at least implied that their dreams have been broken in some way. It could be said that, along with The Power of Friendship, One Piece runs on dreams. Let's go more in-depth, shall we? Dreams in One Piece serve a motivations and obstacles for many characters. Some have already clearly given up. Some never will. But the importance they play in the series is undeniable.