Gol D. Roger is one of the most important characters in One Piece that fans have seen over the years. This character essentially kickstarted the beginning of the series by finding the great treasure of the One Piece and becoming the Pirate King. Roger was executed at the very beginning of the series, but his legacy is unparalleled. One of the greatest things about Roger is that he reached the pinnacle of strength, such that even the strongest of characters could not defeat him in battle.