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While many of the baddies from One Piece, like Don Krieg, Crocodile, Enel, and Blackbeard walk the range from insensitive jerks to all out line-crossing assholes, there are a few villains who believe that the above characters just weren't evil enough:

  • While the first couple of One Piece villains were simply obnoxious assholes whose most heinous deeds were committed when provoked, early villain Captain Kuro was the first of many true monsters in the franchise. While first appearing as the snooty but well meaning butler serving a kind-hearted woman named Kaya, Kuro was secretly a retired pirate captain who had grown sick of running from the law and was hatching a plan to raze the island he was hiding out on to the ground in order to obtain a large sum of money, most of it from Kaya's inheritance. He had his old crew of Black Cat pirates hiding in wait ready to invade the town and assault it while Kuro would attempt to hypnotize Kaya to leave him as the one to inherit her fortune before executing her. He didn't even NEED to kill Kaya, but he wanted to in order to have peace of mind, since he had always hated Kaya and thought catering to her whims to be degrading. Since he'd been acting as a father figure and friend to Kaya for years, this is truly despicable and heartless, and incredibly hurtful to Kaya when she gets told it by the man himself. He also attempted to wipe out his own crew in order to keep up the charade of Kuro dying a long time ago, showing that he was enough of a scumbag to view his own allies as disposable pawns, a view which seriously pissed off Monkey D. Luffy who holds camaraderie and friendship in high regard. It's hilariously fitting that Kuro's fate after the subsequent beat-down by Luffy was to end up forced back into the role of a pirate captain, on the run for the rest of his life with Marines and Bounty Hunters in hot pursuit.
    • The method Kuro used in order to fake his death before taking on the Klahadore persona already showed how little he valued his crew member's lives: he had his first mate Jango hypnotize a crewmate of theirs in order to brainwash him into believing that he was Captain Kuro and left him to be executed so Kuro could save his own skin. While Alvida, Morgan, and to an extent Buggy were quite dickish to their henchmen (Morgan executing a marine who wouldn't kill a small child being the worst of the bunch), Kuro is the kind of guy who will happily slaughter you even if you are a loyal pirate as long as it would benefit him.
  • The disgustingly sadistic and arrogant Spandam is living proof that even a complete and utter weakling is more than capable of being absolutely vile. While he at first seems like a clumsy, comedic villain in the vein of characters such as Buggy the Clown, it doesn't take long for his true, nasty self to rear its ugly head. While he follows the doctrine of Absolute Justice, he's more interested in acquiring weapons and stroking his ego as opposed to altruistic reasons and isn't afraid to backstab, exploit loopholes, or use others to get what he wants. In the past, he destroyed a judiciary ship in a false flag attack and blamed the warships Franky's mentor Tom created after Tom refused to hand him the blueprints of a powerful weapon, and carted him off to the hellish prison Impel Down. When Franky tried to stop him, Spandam caused his body to be nearly mangled beyond repair by running him down with a train, cackling like a madman while he ordered the engineers to keep going. If that wasn't bad enough, there's also his treatment of the captive Nico Robin: He spends most of his time ruthlessly beating her into a bloody pulp as well as psychologically tormenting her as a means to completely break her spirit while she has absolutely no means of fighting back. And on top of that, when his back is up against a wall, he blames his group of incredibly powerful assassins for his shortcomings, and attempts to have them all executed via an illegally aquired Buster Call. Needless to say, it's incredibly satisfying to watch Robin slap him silly in return and break his spine, leaving him as a cripple with said group of powerful assassins he betrayed hot on his trail.
  • Shiliew/Shiryu of the Rain, the bloodthirsty former Head Jailer of Impel Down counts. Completely Ax Crazy, he murdered dozens, if not hundreds of prisoners for fun, claiming them to be "just trash" and disgusted the current Head Jailer so badly that he had him arrested and locked in the prison's lowest level. When freed as a last resort to stop a mass-breakout, he cuts down his former workmates with no regard for them and sides with Blackbeard, but thinks of betraying him if he does not succeed in stealing Whitebeard's power. It's clear he has no empathy and loyalty for anyone but himself.
  • Admiral Akainu, a wonderful example of a Knight Templar who crosses the barrier between Well-Intentioned Extremist and Complete Monster. He debuts while crossing the Moral Event Horizon: he orders his subordinates to blow up a ship of evacuees that the Marines had promised to spare. His justification was that he thought that if there were any survivors from Ohara that the world would be in grave danger, although there's no proof that survivors of Ohara actually present any danger. Later in life, he brutally murders anyone who tries to flee from the battle at Marineford with his horrifying magma powers despite the fact that they'd make absolutely no difference in that fight other than serve as cannon-fodder for Whitebeard and his allies. Then there's what he does to Coby: The kid is pretty much the Only Sane Man and calls out everyone for wasting tons of marines' lives for the sake of killing a handful of pirates. Akainu immediately tries to kill him - and they're theoretically on the same side! If not for Shanks... He moves the series into Darker and Edgier territory by causing the first major present-day story death. When Sengoku stepped down and Aokiji had to fight Akainu for the position, which Aokiji ultimately lost, he left the Marines rather than serve under him. The guy is that bad.
  • While all the Celestial Dragons are horrible elitists that believe they can do whatever they wish to people, Saint Charloss of the Roswald Family is easily one of the worst. He takes a liking to a pretty nurse and decides to make her the latest in his harem of unwilling wives. When her fiancé protests, Charloss shoots him. Charloss attempts to shoot anyone who irritates him with full legal immunity for himself, and treats anyone lower on the social ladder as less than dirt, even beating a wounded man for not kneeling to him. He and his family also attend a slave house where they purchase slaves for any purpose they want, and when the reformed villain Hacchan encounters Charloss, Charloss shows himself as a murderous racist towards the Fishmen and nearly kills Hacchan by gunning him down. If that wasn't enough, he tried to buy a mermaid named Kamie for the sole purpose of feeding her to his pet piranhas.
  • Hody Jones, a Fishman who takes Arlong's Fantastic Racism and turns it Up to Eleven. He's more brutal, more racist, more treacherous, and more cruel, but the kicker? He pulls a reversal on Arlong's sole Pet the Dog moment; whereas Arlong was mortified when Luffy used a Fishman as a human shield, Hodi actually uses a Fishman as a human shield against an attack. One of Arlong's former crew, Hatchi, stated that, while Arlong was a bastard through and through, he'd never hurt a Fishman no matter what. Hody, on the other hand, is known for killing any who talk to or know them. In fact, when he tries to take over Fishman Island, part of his plan is to execute all who had signed Queen Otohime's petition. This means that he's planning to murder thousands of its residents. He already killed Otohime and framed the human he hired to burn the petitions in the first place as part of this plan... and got cocky enough to brag about it in front of all Fishman Island.
  • Arlong himself is this if you don't see his care for his Fishman crew's well being to be redeeming enough, as he seems to lack any personal relationships, valuing his crew mates for what they are instead. Everything else about him is just vile. To wit, Arlong is a sadistic Fishman pirate who invaded Nami's home island and began to extort money from the citizens of various surrounding villages, ordering them to pay a large sum of money or to forfeit their lives (And has destroyed at least one village entirely due to one person not being able to pay up). Unfortunately for Nami and her sister Nojiko, their mother (Adoptive in Nami's case) Bellemere didn't have enough money to pay for all three of them, and instead chose to pay for them while sacrificing herself in their place. After taking sadistic pleasure in snuffing out their mother's life in front of her children and using her as an example to humans who defied him, Arlong establishes himself as the island's dictator and keeps humans opressed beneath his abusive iron grip, then captured Nami and decided to use her as his personal map-maker, offering to let her go free if she put her life on the line to deliver his crew a total of 100,000,000 berries (Currency in the One Piece universe). However, Arlong had no such plans to let her go; he arranged with a corrupt Marine official to confiscate her money so she could serve Arlong forever as he found her map-making talents far too useful for her to be let free. What's worse is that he still considered Nami to be his shipmate, infuriating Luffy with how his actions show that he doesn't truly know the meaning of the term, enough for him to pummel the living hell out of him so badly that prior to a Retcon in later chapters, Arlong actually appeared to have been Killed Off for Real at the end of the fight.
    • And if all that wasn't bad enough, you have this guy to thank for Hody's brutality later in life since he was his childhood hero thanks to the rousing speeches Arlong delivered about Fishman superiority.
  • Punk Hazard gives us the truly detestable Mad Scientist Caesar Clown. A Villain with Good Publicity who's convinced people he's a kind master and scientist who just wants to help people. The truth is that Caesar is violently jealous of his former associate Dr. Vegapunk and once took that frustration out by blowing up an island. In the present, Caesar 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 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 him. 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. His psychotic ego is rivaled only by his mile long sadistic streak.
  • Clown's boss is even worse if that's possible. Enter Donquioxte Doflamingo, one of the Seven Warlords of the sea, a former Celestial Dragon, and a flamboyant, gleefully violent lunatic of a man who rules over Dressrosa as its tyrannical king. Before the Dressrosa Arc it was very apparent that Doflamingo was not a good guy: Under the alias of Joker he participates in the slave trade by selling innocent people to the Celestial Dragons who are famous for treating their slaves like dirt, and he also works on the side as an arms dealer to Kaido, one of the Four Pirate Emperors by having Clown perform horrifically inhumane experiments involving lethal artificial Devil Fruits on innocent people (even children) that would inevitably kill them in pursuit of creating an army for Kaido. He also built up a reputation of a man not to be crossed by annihilating entire villages for petty reasons such as someone looking at him funny. But during the Dressrosa Arc is when he's shown at his worst: before the arc even began he approached its former ruler King Riku and blackmailed him into turning over the island kingdom to him for a large sum of money. Despite Riku being desperate to get his people to pool enough money together to pay Doflamingo, the bastard took control over him as well as his soldiers with his Devil Fruit powers and forced them to slaughter their own people before jumping in and "saving" the day after causing enough chaos and claiming the throne for himself. Under his rule the people of Dressrosa are transformed into toy slaves by one of his executives and are forced into labor, with their transformation's effects causing their loved ones to forget about them. When Luffy and Trafalgar Law form an alliance to overthrow Doflamingo, he responds by entrapping the city inside of a huge cage of strings dubbed the Birdcage which in time would slowly close in until it slices everyone inside to pieces as punishment for their defiance. And he's hardly exclusively horrible to people who oppose him: everyone close to him can find themselves victims to his wrath as well. He was willing to set up his own brother to die in an attempt to use his powers to grant himself immortality, tortures a fanatically loyal flunky of his named Bellamy for failing a mission and allows him another chance to prove himself only to have him killed anyway for being an eyesore, kills another loyal follower named Vergo by blowing up an area he was in, played off his executive Baby 5's dependence on love and affection to instill loyalty in her, and knows full and well that his henchmen will fall victim to The Birdcage and doesn't care in the slightest. He seems to treat members of his inner circle nicely, but as Law points out: he runs his so-called family on a foundation of ego and control and despite appearing to treat them nicely in return for their loyalty, he will happily toss them aside when he feels that he will get some sort of benefit from doing so, seeing them as disposable and replaceable. Ultimately Doflamingo proved to be a thoroughly narcissistic sociopath who's incapable of ever placing anyone else above himself.