One PieceEdit
In One Piece, there are many jolly roger flags. Jolly rogers generally help pirates determine who belongs to whose crew, or even who is a pirate in the first place. Many choose to bear their crew's flag somewhere on their personal being (such as Portgas D. Ace). Certain nations who understand the ideals of the jolly roger, or have turned against ideas of the World Government, also raise the flag, such as the emancipated Drum Kingdom after the fall of Wapol.
However, raising the jolly roger is considered a huge crime by the Marines, and anyone seen doing so (may it be fun or for real) will be considered criminals. The designs of the jolly roger usually reflect the interest of the captain of the crew. Other times it may be physical resemblance (Whitebeard's mustache or Shanks's three scars on one eye), a personal item they wear (Luffy's straw hat), or the symbols behind them.[1]