Although on its surface, One Piece feels like a goofy adventure about young and optimistic pirates, beneath the surface, the series can be an incredibly dark experience. More often than not, while the usual adventures of One Piece are a more standard fantasy experience, the backstories of One Piece tend to lean heavily into far darker subject matter. This leads many to consider moments like Robin’s, Law’s, or Nami’s backstory as being some of the darkest moments in all of One Piece.