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 with "GAS" printed on each side 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, as well as trust Monet's deduction that the Straw Hats might be more powerful than their bounties claim. 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.

He has a distinct laugh of "Shurororororo".

Subordinates
Brownbeard and the other centaurs think of him as a kindhearted god and trust him blindly. Brownbeard is extremely grateful to Caesar for taking him in after he lost the use of his legs. He compares Vegapunk to the Devil and Clown to God and believes that Caesar continues his research for the good of mankind. However, Caesar doesn't seem to care about his underlings, as he exploited their blind trust to test a new gas on some of his subordinates. When he deems Brownbeard useless, he decides to have him killed along with the Straw Hats. Monet seems to be very close to Caesar and unlike the centaurs, she is aware of Caesar's true nature.

Trafalgar Law
Even though they are partners, the two of them do not 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.

Weapons
He was seen using a flintlock to threaten Law when he learned of his association with Monkey D. Luffy.

Chemical Weapon Incident on Punk Hazard
Punk Hazard was once full of lush green vegetation, teeming with life, when it still remained Vegapunk's experiment facility where he tested weapons and drugs along with Caesar Clown. Some convicts were brought to the island instead of prison, to be used as guinea pigs for their human experiments. Then, four years ago, one of the chemical weapons experiments failed and demolished 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 prisoners and sealed off the island before making their escape, while, left with no other choice, the prisoners flocked to the only research building still standing. If they didn't die, their lower bodies became useless due to the effects of a powerful nerve agent. All seemed lost. But then Caesar Clown appeared before them to 'help', appearing to be a benevolent benefactor- as they were unaware he was the one truly responsible for the incident on the island..which he deemed a resounding success.

The truth was Clown had made the weapon and was responsible for letting it go off 'accidentally'. He and Vegapunk were always bitter rivals, and though he saw it as a successful experiment to put him ahead, developing a weapon for mass murder that spreads poison gas is illegal and Clown had been caught and arrested. However, he escaped the prison ship to return to Punk Hazard and was never seen or heard from again.

Caesar's Return to Punk Hazard
A year later, Caesar Clown returned to the island and used his ability to purify the gas. He also made artificial legs for those who couldn't walk and took them in as his subordinates. Brownbeard arrived on the island a year after Caesar did. There was still poisonous gas, which made him incredibly sick. Just before giving up on life, Caesar and his subordinates appeared and saved him. When Trafalgar Law came to the island, Caesar 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 as he purged the chamber along with the loyal centaur inside, 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. He adds that he had even followed up & done surveillance on all the victims of that experiment, documenting the affects, as proof of his scientific mastery. 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 look in his eyes and a frown. Caesar is in good spirits thanks to the capture of Smoker's heart (likely planning experiments with it) and says that he already sent soldiers to deal with the Marines and that he knows what the outcome 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 them: the Hitmen of the Snowy Mountain, the Yeti Cool Brothers. When Caesar finds out that Law has associated with the Straw Hats, he pulls a pistol on him and questions him about his relationship to the notable pirate.

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.

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Caesar Clown