Despite the overall upbeat nature of the Straw Hat Pirates’ adventures, which are more often than not accompanied by carefree laughter and humorous shenanigans, One Piece's tone isn't always jovial. On top of the high-spirited journey in search of treasure and absolute freedom, One Piece also features some of the darkest depictions of human cruelty, devastation, and terror ever shown in shonen anime.
Source：https://www.cbr.com/dark-one-piece-moments/
