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->''"I told you the time limit was an hour...but that's just when the cage closes completely. There are injured people out there, and elderly folk who can't stand. Suckling little infants as well! Who will be the first to die? Within 30 minutes people will be sure to start dying somewhere! And within 40...we will be able to hear their screams from here! Within 50...this country will be stained red as a crushed tomato with their blood! And in an hour...no voices will be left to cry out!"''
-->--'''Donquixote Doflamingo''', planning to kill everyone in [[Recap/OnePieceDressrosaArc Dressrosa]]

While many of the baddies from ''Manga/OnePiece'' range from mere insensitive jerks to all-out line-crossing assholes, there are a [[CompleteMonster few villains]] who put all others to shame. Characters are listed by the arcs where they have the most impact; they may have appeared earlier or appear later.

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* [[Recap/OnePieceKuroArc Kuro Arc]]: The titular Captain Kuro, one of the earliest villains, was once a feared pirate known as [[TheChessmaster Kuro of the Thousand Plans.]] Wearied from an existence on the run from bounty hunters and the Marines, Kuro hatched a scheme: he slaughtered every marine on a ship, save one, and had his right hand man [[TheDragon Jango the Hypnotist]] hypnotize a crewmember and the surviving marine to make them think they were Captain Kuro and his captor, leading to the execution of the fake Kuro. Kuro traveled to Sugar Island where he became the butler of [[IllGirl a kind, sickly girl named Kaya]] under the name "Klahadore", looking after her after her parents died. Kuro plotted to have his former crew arrive and slaughter the island while he'd have Kaya hypnotized to write him as the beneficiary of her will before [[WouldHurtAChild he murdered her]]. After Kaya bought him a gift of [[FourEyesZeroSoul new glasses]], Kuro [[UngratefulBastard heartlessly crushed them]] and attempted to kill her other servant Merry. When Kaya said she'd have just given him the money, he admitted he just wanted her dead [[ForTheEvulz for the sake of his ego]]. Kuro was also planning on [[BadBoss killing his crew]] to complete his disappearance and when fighting Luffy, used an attack that led to them being nearly massacred by him. Though an early villain, Kuro was easily one of the most vile.
* [[Recap/OnePieceMarinefordArc Marineford Arc]]: [[KnightTemplar Admiral Akainu]], real name Sakazuki, [[EstablishingCharacterMoment makes his debut]] by ordering his subordinates to blow up a ship of evacuees that the Marines had promised to spare. Later on, he brutally murders anyone who tries to flee from the battle at Marineford. He also tried to murder Coby when the latter calls out everyone for their violence, despite the two supposedly being on the same side. [[KnightOfCerebus He darkens the tone of the series]] by causing the first major present-day story death, that of [[spoiler:Portgas D. Ace, who sacrifices himself to safe Luffy]]. To give an idea how bad he is, when Sengoku stepped down and Aokiji had to fight Akainu for the position, when Aokiji ultimately lost, he left the Marines rather than serve under him.
* [[Recap/OnePieceFishmanIslandArc Fishman Island Arc]]: [[KnightTemplar Hody Jones]] is a [[FishPeople fishman]] with all of Arlong's [[FantasticRacism hatred of humans]] but none of his care for his fellow people. Disgusted by the benevolent Queen Otohime's petition that intended to improve relations between humans and fishmen, Hody Jones hired a human to burn the signature box. Hody then assassinated Otohime and [[FrameUp framed the human]] for it, proudly bragging about his crimes when they're discovered. When he takes over Fishman Island, he declares that all of the fishmen who had signed Queen Otohime's petition will be executed. When his ally Vander Decken uses his Devil Fruit power to send the giant ship Noah after Princess Shirahoshi, Hody mortally wounds Vander Decken to cause the latter's powers to deactivate in an attempt to [[ColonyDrop have Noah crash down on Fishman Island]].
* [[Recap/OnePiecePunkHazardArc Punk Hazard Arc]]: [[MadScientist Caesar Clown]] has [[VillainWithGoodPublicity convinced people]] he's a kind master and scientist who just wants to help people. The truth is that Caesar is [[GreenEyedMonster violently jealous]] of his former associate Dr. Vegapun and once took that frustration out by blowing up an island. In the present, Caesar [[WouldHurtAChild keeps multiple children in his lab]] with promises to cure them of their sickness, and gives them candy to help them. The "candy" is in truth an addictive drug to keep them enslaved to him, and his experiments will cause their deaths in five years. He shows no remorse, laughing that he can always get more children. Caesar also saved pirates and sailors from death, but uses them as test subjects as well and turns them against their captain who was just trying to save them from Caesar. When his back is against the wall, Caesar has no compunction killing these men with a poison gas he unleashes in an attempt to kill Luffy. Caesar has [[LackOfEmpathy no loyalty]] to anyone but himself and his [[ItsAllAboutMe psychotic ego]] combines [[ForScience scientific drive]] with a {{sadist}}'s streak a mile long.
* [[Recap/OnePieceDressrosaArc Dressrosa Arc]]: [[AgentPeacock Donquixote Doflamingo]] (the boss of the aforementioned Caesar Clown, incidentally) is steadily revealed as the [[ItsAllAboutMe epitome of selfish egomania]] whose own brother describes as having been born an evil madman, despite his servants' UndyingLoyalty towards him. In the guise of "Joker," Doflamingo is a mover and shaker in the criminal underworld where he participated in a slave trade for the pleasure of the corrupt Celestial Dragons. When conquering his old kingdom of Dressrosa, Doflamingo enslaved the people by turning many into toys and making their loved ones forget them, and [[FrameUp framing]] the good-hearted King Riku Dold by forcing him to attack the people he loved so much to make Doflamingo a "hero" for removing him. It is also revealed he planned to brainwash Trafalgar Law into being his loyal slave who would gladly trade his life to bring Doflamingo immortality, executing his own brother Rosinante when Rosinante tried to save Law. In his crowning moment of evil, Doflamingo attempted to [[RazorFloss massacre everything in Dressrosa]], [[BadBoss his own men included]], gleefully proclaiming he would just find a new country and "family." Even upon his defeat, all Doflamingo cares about is seeing the news so he can appreciate the chaos the world is thrown into by recent events.

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