Caesar Clown

Caesar Clown, also referred to as "Master" (マスター) by his underlings, is a former colleague of Vegapunk and the main antagonist of the Punk Hazard Arc. Caesar is the leading expert on mass-murder weapons and is a mad scientist with a bounty of 300,000,000 on his head.

Appearance
He has a very gaseous look, probably due to his Devil Fruit power. He has very long, spiky dark hair and two horns growing from the back of his head. He appears to be tall, and apparently wears dark makeup on his eyes and lips. He also wears gloves with the initials "CC" on them. It seems like he is wearing a big coat and a pair of diagonally striped overalls underneath.

Personality
He appears to have a grudge against Vegapunk, as well as a somewhat rational personality, as shown when he hid from the Marines instead of trying to fight them immediately. It was stated by Smoker that he was one "crazy bastard".

He is a very prideful person, going as far to say that his work four years ago on the mass murdering weapon that caused the Punk Hazard incident was not a failure, but instead was a great success, hinting at a superiority complex.

He is also very ruthless, as he used the blind trust of his injured subordinates to test a newly developed gas. Caesar also seems to like cocktails, as he is often seen holding a cocktail glass. He also used the restricted drug NHC10 to maintain his hold on the children he kidnapped.

Subordinates
They think of him as a kindhearted god and trust him blindly. Caesar on the other hand, doesn't seem to care about them, as he exploited their blind trust to test a new gas on some of his subordinates. Monet seems to be very close to Caesar and unlike the centaurs, she is aware of Caesar's true nature. Brownbeard is extremely grateful to Caesar for taking him in after he lost the use of his legs. Brownbeard compares Vegapunk to the Devil and Clown to God. Clown still continues his research for the good of mankind even today, and the Straw Hats will have to submit their bodies to his experiments every now and then.

Trafalgar Law
Even though they are partners, the two of them don't appear to be very open with each other. The extent of their partnership is currently unknown.

Joker
Joker seems to be an associate of Caesar's and he is assisting the scientist in keeping his activities on Punk Hazard a secret. Caesar needs Joker to approve of his actions before committing them, to avoid drawing attention to Punk Hazard.

Vegapunk
It is stated by Smoker that Caesar was Vegapunk's former colleague and used to have a rivalry with him but Caesar always ended up as number 2, which might be the main reason for his holding a grudge against him.

Abilities and Powers
Caesar seems to have authority over the satyrs, as they called him "Master."

He also has considerable scientific and chemical expertise, as he was Vegapunk's second-in-command and caused a chemical weapon explosion that rendered Punk Hazard a barren wasteland. He also uses the highly restricted drug NHC10, though his authorization on its usage is unknown.

Devil Fruit
Caesar has eaten the Gasu Gasu no Mi, a Logia-class Devil Fruit that grants him the ability to change into a vapor-like form, allows him to float and go inside places that no normal being can, as he was seen hiding inside some flasks when he was informed that the Marines were nearby. However, even in his intangible gaseous form, he can become dense enough to hold objects, like his cocktail glass.

Chemical Weapon Incident on Punk Hazard
Punk Hazard used to be full of lush green vegetation, teeming with life. It used to be Vegapunk's experiment facility where he tested weapons and drugs. Some convicts were brought to the island, instead of prison, to be used as guinea pigs for his human experiments. Then, four years ago, one of Vegapunk's chemical weapons experiments failed, demolishing two of the three laboratories. The explosion brought about extreme heat and sent poisonous particles into the air, killing everything. The government workers abandoned the prisoner and sealed off the island before making their escape. The prisoners flocked to the only research building still standing. If they didn't die, their lower bodies became useless due to a powerful nerve gas. All seemed lost. The one responsible for the incident on the island was in fact Caesar Clown. Clown made the weapon and was responsible for letting it go off accidentally. He and Vegapunk were always rivaling each other. However, developing a weapon for mass murder that spreads poison gas is illegal. Clown was caught and arrested. However, he escaped the prison ship and was never seen or heard from again.

Clown's arrival at Punk Hazard
A year later, Caesar Clown came to the island. He used his ability to purify the gas, and made artificial legs for those who couldn't walk, whom he also made his subordinates. Brownbeard arrived on the island a year after Clown did. There was still poisonous gas, which made him incredibly sick. Just before giving up on life, Clown and his subordinates appeared and saved him. When Trafalgar Law came to the island, Clown formed an alliance with him.

Punk Hazard Arc
Caesar was first seen after Franky and his group broke out of their cell. As he examined the hole that Franky made, he commented that only Vegapunk's laser was capable of such a feat. When he heard Trafalgar Law was fighting the Marines from G-5, Caesar was displeased since the plan was to chase them away. He was then shocked to be informed that the Marines saw the kidnapped children and feared that his secret activities would be exposed. Monet then arrives and informs him that Vegapunk's dragon and Brownbeard's centaur patrol unit were defeated. He then learns of the Straw Hat Pirates' presence on the island.

After Law deals with the G-5 Marines and returns to the facility, Caesar berates the Shichibukai and demands an explanation for his actions. Law replies that he is the one who should be complaining.

He soon contacts a person named Joker who gives him permission to kill the Straw Hats, the G-5 Marines, and Kinemon while Joker will make it look like an accident at sea. One of the centaurs defeated by Luffy's group then come to Caesar, telling him that Brownbeard has been captured and begs him to help. Caesar tells him that he has a medicine ready and that he will heal him and the other centaurs. However, instead, he locks the centaur in a chamber and exposes him to a seemingly new gas he developed. Caesar asks him for certain symptoms, like nausea and hallucination, and the centaur appears to have them. Caesar is next seen pressing on a button, and a explosion-like sound is heard, and in the next panel, smoke coming out from a shaking exhaust pipe is seen.

When Monet asks whether his experiment failed, he claims none of his experiments ever fail, even during the "failed" experiment four years ago where his weapon of mass destruction killed a massive amount of people. In this moment, he says that he has even done surveillance on the victims of that experiment. He euphorically asks the World Government (though not directly) where the failure is and tells them that he will show them who the number one scientist is.

Law later gives Smoker's heart to Caesar. Caesar holds Smoker's heart in his hand, while Law looks on silently, with a displeased in his eyes and a frown. Caesar is in good spirits thanks to the capture of Smoker's heart, and says he's already sent soldiers to the Marines and that he knows what the outcome of that will be. Law asks what happened to Straw Hat, and Caesar reveals that having taken Monet's warning about the Straw Hats' possible increase in strength seriously, he sent two powerful people after him: The Hit-men of the Snowy Mountain, "Yeti Cool Brothers".

Trivia

 * Caesar was the title for the Roman emperors, derived from the cognomen of Julius Caesar.
 * Like Magellan, Caesar's sinister face, wild hair and horns make him resemble a stereotypical image of a demon; particularly Baphomet, a pagan deity-turned-devil most commonly depicted as a humanoid goat.
 * He has a distinct laugh. "Shulololololo or Shurororororo".

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