Pure Evil Wiki

Shuorororo...! What good honest kids we have this time as well! And the rest are undergoing their gigantism so mindfully! Of course, there are limitations to the drugs in this experiment, their bodies won't hold. Five years from now, not even one of them will be alive! Shurororo, we'll have to search for the next fresh bunch when that time comes! You learn from failed experiments and move forward, improving upon them, it's an unavoidable sacrifice!
~ Caesar talking to Monet.
Just watch... I'll teach you who's the world's number one scientist!
~ Caesar Clown

Caesar Clown is a mad scientist who was allied with the Donquixote Pirates. He is a cruel and sadistic scientist who only cares for himself. He is the main antagonist of the Punk Hazard Arc in One Piece.

Caesar is voiced by Ryūsei Nakao who also does the voice for Frieza.


Caesar once worked with the World Government and worked alongside Vegapunk. However, Caesar was envious of Vegapunk and his skills. One day, Caesar was angry he destroyed Punk Hazard by setting off a bomb. The bomb ended up killing hundreds and reducing the island to wasteland. Caesar was arrested but managed to escape. He soon became an ally to Doflamingo and would work alongside him to mass produce SMILE fruits for Kaido and the Beasts Pirates on Punk Hazard. Caesar would help rescue pirates who landed on Punk Hazard. However, he would experiment on them and kill many of them while experimenting on them. Caesar would also order some of his men to abduct children from nearby islands and feed them a drug to make them giants. Caesar intended to make them giants but know that they will die within five years.

Trafalgar Law wanted to join an alliance with Caesar but Caesar takes Law’s heart to make sure his intentions were honest. Soon afterwards the Straw Hats appeared on Punk Hazard where they put up a challenge to Caesar. Caesar wanted to capture Franky since he was interested in his cybernetic body. During the Straw Hats time on the island, the marines also appeared. Caesat also fought and captured Luffy. When he found out that Law betrayed him, he tortured him. Caesar also met with the drugged children who were furious as a result of the drugs they were given and manages to retrieve them. Caesar also mocked Brownbeard after the latter found out the truth about Caesar and his experiments. Later on, the Straw Hats broke out of their confinement and fought against Caesar. Luffy managed to fight Caesar a second time. Caesar contacted Doflamingo for help. Luffy encounters Caesar a third time, where Caesar drops his fake interests with the Pirates and began using the Shinokuni gas to petrify them while he fights Luffy. Luffy defeats him and Caesar tries to escape the island but was captured by Franky.

Caesar was used by the Straw Hats and Law to bargain against Doflamingo so the latter could resign as one of the Seven Warlords. Caesar and the others landed on Dressrosa to confront Doflamingo but the plan failed. Law and the some members of the Straw Hat crews arranged to go to Zou to escape from Doflamingo. While on Zou, Caesar was excited about the power of his weapon the Koro gas that Jack used against the Minks when he invaded the country. Caesar was interested in looking at the dying Minks. Caesar refused to help them until the Straw Hats threatened him to do it grudgingly. After saving the Minks, Caesar and Sanji were taken by Capone Bege and sent to Whole Cake Island. While on the island, Big Mom expects Caesar to make the chemical that would make her family bigger and gave him a week to accomplish this. However, he was saved by Bege and entered into an alliance to try and assassinate Big Mom. Caesar assisted Bege and the Straw Hats against the Big Mom Pirates. When they were escaping from them, Caesar was given his heart back by Bege.

What Makes him Pure Evil?

  • Caesar sets off a bomb on Punk Hazard killing hundreds of people on the island. The bomb also laid waste to the entire island killing the vegetation and turning it into a wasteland. His reasons for bombing the island was because of his envy, anger, and hatred of Dr. Vegapunk.
  • Caesar would help save pirates who landed on Punk Hazard, but he would experiment on them. He would also kill them during his experiments. Caesar would manipulate the pirates to work for him although he does not care about them.
  • Caesar had his men abduct children and feed them drugs in the form of candy. The drug would make them grow in size to become giants. However, the drugs would cause pain to the children by turning them into homicidal and raving lunatics. Caesar fully knows that the drug would cause their deaths in five years and does not care. He intended to get more children for his experiments.
  • While unleashing the Shinokuni gas, Caesar was willing to let one of his partners, Vergo, die since he was in the wrong place at the wrong time. Caesar called him an idiot and did not care.
  • Caesar attempted to kill Smoker out of spite for his failed plan by stabbing his heart. However, Law swapped out Smoker's heart for Monet's causing him to kill her instead and leaving him confused about why Smoker is still alive.
  • Caesar unleashed the Shinokuni gas on the pirates he saved. He attempted to kill all of them in his fight against Luffy. He mocked them saying they mean nothing to him before attempting to kill them.
  • Caesar refused the save the Minks from the chemical weapon that Jack used against them. He was only interested in watching Jack's victims die in front of him and seeing how the chemicals destroy their bodies. However, he did help create an antidote to save them, but only because he was threatened by the Straw Hats who threatened to kill him by squeezing his heart.
  • Although Caesar was a business partner of Big Mom, he lied to her about the incident on Punk Hazard to put the blame on Law and Luffy for why his gigantification experiments did not go anywhere. However, he embezzled the funds Big Mom used to pleasure and entertain himself. He betrayed Big Mom by allying with Capone Bege in his plan to assassinate her. He used the opportunity to help retrieve his missing heart and save himself.
  • Caesar threatened to kill Capone Bege's baby son, Capone Pez, if Bege could not return his heart to him.


  • Since the Punk Hazard Arc, Caesar has been portrayed as more of a comic relief and no longer a real threat to the protagonists. Despite this portrayal, Caesar still has not expressed anything redeeming to his character and, on many instances, was against helping others and threatened others.

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Captain Kuro | Akainu | Hody Jones | Caesar Clown | Donquixote Doflamingo