To simply state, every theme that is desired from a Shounen Manga is included in One Piece. I would say the overall perspective of One Piece can be mirrored to that of The Lion King. It's impossible to dislike the Lion King, because it addressed so many themes that relate to ourselves and society. The same goes for One Piece. One Piece addresses the importance of Friends, Family, Trust, Goal Orientation, Belief, Happiness, Sadness, and all the common themes that make us go through the day and want to read page from page. Each journey and island that is included in the making of the One Piece story tackles a different theme, and with it different obstacles and challenges. Just like The Lion King is a story which we always remember of a lion who lost his father in return to fight for his throne, I will always remember One Piece as the journey a pirate named Luffy ventured to be the King of Pirates and find the hidden treasure, One Piece.