Caesar Clown

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Template:Char box Caesar Clown (シーザー・クラウン, Shīzā Kuraun^?), also referred to as "Master" (M（マスター）, Masutā^?) by his underlings, is a former colleague of Vegapunk and the primary antagonist of the Punk Hazard Arc. Caesar is the leading expert on chemical weapons of mass destruction and is a demented scientist with a bounty of 300,000,000 on his head.

Appearance

Caesar has a very gaseous look due to his Devil Fruit power. He has very long, spiky, dark hair, brown eyes, and two curly horns growing from the back of his head. He appears to be tall, and wears purple lipstick and dark makeup on his eyes. He has a small flat nose and long thin eyebrows. His arms are very thin in comparison with to rest of his body.

Caesar wears a big light blue colored coat with "GAS" printed in pink on each side (in his first appearances this was not present). Under his coat, he wears a pair of diagonally striped yellow overalls which are striped cross with orange lines. The overall is cut off right under his knees, exposing his hairy legs. He also wears dark purple gloves with the initials "CC" in white on them. Due his constant gaseous form, he seems to not use shoes, remaining barefoot, though only when his powers were disabled, his feets solidified with the rest of his body.

Four years before his debut, Caesar had shorter hair that was more rounded, and wore a polka dot patterned shirt beneath his coat.

During his third fight with Luffy, Luffy greatly damaged Caesar's face, which knocked some of his teeth out and bent his facial structure inwards, and seemingly breaking his nose. As result, his pronunciation became a bit hard to understand.

After absorbing the Shinokuni, Caesar's entire body structure changed to a darker gas color matching that of the gas, becoming comparably large to a giant, with his hair going completely wild and overly long, and grows behind his horns a coral-shaped crown. The word in kanji "Land of Death" (死国^?) is written on the front of his chest. Upon his defeat, he returns to normal.

Gallery

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Caesar's color scheme in the manga.

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Caesar as he appeared four years before the Punk Hazard Arc.

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Caesar's face after being broken by Luffy.

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Caesar after merging with Shinokuni.

Caesar's human form, with his gas form disabled.

Personality

Caesar is, in Smoker's words, "one very crazy bastard", and his actions on Punk Hazard more or less validate the Marine vice-admiral's claim. A very cruel, arrogant, scheming, sinister, and overall a very evil person, Caesar takes great delight in causing harm and destruction to anything and anybody around him. His psychopathic nature is displayed many times, such as when he set off a chemical weapon on Punk Hazard, killing millions of its inhabitants and destroying its environment, selling or creating weapons of mass destruction for similarly unscrupulous individuals such as Doflamingo, performing sick experiments on children and drugging them with a lethal, addictive drug to ensure that they don't run away, and trying to murder everyone on Punk Hazard (Trafalgar Law, the Straw Hats, Smoker's Marines, the children, and his own (blindly loyal) minions) so he could test out his new poisonous gas weapon-pet, Smiley – all of which he does without a shred of remorse or empathy for his potential victims.

He appears to have a grudge against Vegapunk, as well as a cautious disposition, as shown when he hid from the Marines instead of trying to engage them immediately, as well as trusting Monet's deduction that the Straw Hats might be more powerful than their bounties claim, and waiting for Joker's approval to make his actions look like accidents, before starting attacks. Caesar is also a rather economizing person, as he did not want to waste the poison, by clearing it off but rather collected, saved and compressed it into Smiley.

He also appears unable to act or lie at times, often being seen overacting fake emotions when lying to his subordinates or the children, a trait that was quickly noted by Monet when he attempted to show false concern for his subordinates facing Smiley. However, with the blind trust of his subordinates and some crocodile tears, he was able to deceive them easily. Caesar also is very ill-tempered and quick to anger when things do not go his way, such as yelling at his subordinates to let the gas come in to kill the intruders and his own men and again when Monet pointed out that Vergo would die and Caesar just yelled unconcerned about his potential disloyalty. Upon losing to Luffy, Caesar lost his composure and front for his subordinates, and ordered them to let in the Shinokuni gas while shouting out that they can easily be replaced, and then going as far as to personally kill the ones present simply to test out his newly acquired power.

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After Chopper praises his creation of SAD, Caesar blushes.

He is a very prideful person, going as far to say that his work four years ago on the weapon that caused the Punk Hazard incident was not a failure, but instead was a great success, implying at a superiority complex. Due to his pride in his own work, he tends to blush when his work is praised, even by the enemy, but turned to indignity when that praise turned towards Vegapunk. He was also shocked to see Smiley not listening to him and eat the candy despite Caesar saying to wait and Caesar said it was alright while Monet noted he was not listening to him. He also does not take kindly to insults, as when Law called him stupid, Caesar lashes out by punching Law's heart. Unlike most Logia users, Caesar keeps his Devil Fruit ability activated all the time and is either completely or partly turned into gas.

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One of Caesar's many face faults.

Caesar has an odd habit of being easily shocked by things that leave him dumbfounded such as when Luffy survived his second Gastanet attack and appeared behind him unharmed, Caesar gave a comical face fault. He did so again when Luffy was about to attack him from behind in their second fight together, which seems to be a running gag on his part. Upon Luffy declaring that he does not want to see Caesar's face anymore out of anger, the scientist seemed hurt by the comment.

He also demonstrates tendencies of egomania when Luffy mentioned his Gasu Gasu no Mi had no effect on his immune system due to Magellan's Doku Doku no Mi, both being poisonous Devil Fruits of differentiating class, causing Caesar to become rapidly aggravated from the fact that Luffy compared his Logia powers to that of a "mere" Paramecia user. He was very surprised that his poisons did not affect Luffy due to the latter's immunity to poison given to him from his near-death poisoning by Magellan.

He has shown to have maniacal tendencies due to his sedulous research on weapons of mass destruction and his absence of emotion at the time of murdering people or provoking any type of suffering such as giving drugs to the children so they would suffer severe withdrawal and return to his research facility for more "candies" filled with the stimulant, and showing no regret or sorrow for his actions.

He also is very sadistic, as he exploited the blind trust of his wounded subordinates to test a newly developed gas and ordered the Yeti Cool Brothers to assassinate Brownbeard when he thought he was no use to him anymore: he further provoked a partially-paralyzed Brownbeard by revealing the truth about the gas explosion four years ago, in order to create an opportunity to have his subordinates to shoot him down. He also used the restricted drug NHC10 to maintain his control of the children he kidnapped, knowing that they will be unable to escape due to the agonizing withdrawal symptoms, and that by his own calculations, they will die in five years after he started his experiments with them, which he deems a necessary sacrifice for his science. Law found this aspect of Caesar disgusting. Caesar also seems to enjoy cocktails, as he is often seen holding a cocktail glass.

He has a distinct laugh of "Shurororororo".

Relationships

Former Subordinates

Brownbeard and the other centaurs once thought of him as a kindhearted savior and trusted him blindly. Brownbeard was extremely grateful to Caesar for taking him in after he lost the use of his legs. He compared Vegapunk to the Devil and Caesar to God and believed that Caesar continues his research for the good of humankind.

However, Caesar does not care about his underlings, as he exploited their blind trust to test a new gas on some of his subordinates. After Brownbeard was captured by the Straw Hats, Caesar deemed him a useless idiot and ordered him to be killed. After Scotch played a recording of Caesar's orders, Brownbeard was crushed when he learned that the man he believed in so much had betrayed him. Before Scotch shot him, Brownbeard's last thought was when Caesar once called him a good leader, and upon reawakening, Brownbeard attempted revenge against Caesar in order to rescue his crew; Caesar, in turn, sadistically insulted Brownbeard, and secretly revealed to him the truth of the chemical weapon incident four years ago, which led Brownbeard to see Caesar as the devil. Even when his subordinates offered to help him during his battle against Luffy, Caesar refused while calling them small-fries.

His cruelty goes as far as to telling his subordinates to take off their protective suits under the lie that it would not protect them from the H2S gas released by Smiley and that it would only weigh them down, in order to fully expose them to the lethal poison as a worldwide demonstration, while secretly sabotaging their escape sled. Upon losing to Luffy and getting desperate, Caesar forgoes all lies and manipulation, and outright ordered his underlings to release the Shinokuni gas into the building while expressing that they are trash that are easily replaceable; though shocked at first, the subordinates swiftly deluded themselves into thinking that Caesar was putting up a ruse to get at Luffy, and did as ordered, only to see, to their horror, Caesar would turn his gas weapon on them as a testament of his new powers.

Caesar seems to recognize the Yeti Cool Brothers’ strength as he ordered them to eliminate the Straw Hats. The Yeti Cool Brothers were loyal to Caesar, as they followed his orders without question. Despite their value, Caesar wasn't too upset about their defeat and even excused their failure by saying that fighting against Law and Luffy was too much.

Kidnapped Children

Caesar has several kidnapped children he had sent to Punk Hazard via Vergo and manipulates them all into thinking he's experimenting on them to save the world and how he "lost" a son of his to convince them. The children all have a high respect for Caesar and decided to stay for his work.

However, in truth, Caesar is using them as guinea pigs and has no remorse in them going to die within five years, stating it is a necessary sacrifice for humankind. Mocha was distraught from when Chopper told her of his betrayal and how he was never planning to let her or the others go home and Momonosuke (who was too proud to accept Caesar's feigned hospitality to begin with) became enraged at the scientist for using the children's feelings against them.

Allies

Monet

Since Monet and Caesar work under the same leader, she is very close to Caesar and is not ignorant of Caesar's true nature.

However, it is revealed that Vergo assigned Monet to infiltrate Caesar Clown's organization on Punk Hazard, due to a mistrust for the deranged scientist. Despite this, Monet unanimously agreed to give her heart to Law when Caesar ordered her to in exchange for Law's heart. Monet does take her assignment in protecting Caesar and his test subjects very seriously as she kept Luffy from capturing Caesar and hindered the Straw Hats and the G-5 Marines from taking the kidnapped children away.

Unknowingly, Caesar is responsible for killing Monet due to him stabbing her heart where he believed he stabbed Smoker's.

Vergo

Caesar also has an association with Vergo due to the latter being a subordinate of Joker. Vergo and Joker's distrust towards Caesar led them to hire Monet and place her in Caesar’s organization to monitor his actions.

In return, Caesar seems to place some trust in Vergo as demonstrated by him giving the Marine Law's heart, who was later able to use it to incapacitate Law when the Shichibukai had begun to move against them, showing that despite any animosity between them, the two men are willing to cooperate to further their agendas. Caesar values him as a strong shield, as Vergo is responsible for providing him with test subjects and kidnapping the children for Caesar to experiment on.

However, Caesar has no regard about Vergo, as when Caesar is about to eradicate the G-5 Marines together with Vergo, he said he does not care about Vergo, while calling him an idiot when Caesar was warned by Monet.

Donquixote Doflamingo

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Caesar speaking highly of Doflamingo.

Caesar is an associate of Donquixote Doflamingo, who operates under the alias, "Joker". Caesar had to ask him for permission to exterminate the Straw Hat Pirates and G-5 Marines.

In turn, Doflamingo does not trust Caesar and orders Vergo to place Monet as a deep cover agent to observe his activities. Despite this, Doflamingo still valued Caesar for being the only scientist able to produce SAD, which would allow the Shichibukai to create the Smile in collaboration with the Yonko, Kaido. For this, Doflamingo threatened Monet with death if she let anything happen to Caesar, and made it priority to retrieve Caesar upon his defeat.

Though Caesar is unaware of Doflamingo's distrust of him, he knows his own value for the Shichibukai, which makes him delude himself into thinking that the protection granted to him makes him untouchable. To this end, Caesar spoke highly about Doflamingo, using his name and infamy in an attempt to scare Luffy from hurting him, all of which ended in failure as the young pirate brutally defeated the scientist. Because Doflamingo does consider Caesar as a valuable asset, he accepted Law's demands and resigned from the Shichibukai to ensure no harm comes to Caesar. In turn, Caesar was extremely grateful and even apologized to Doflamingo for being forced to resign from the Shichibukai.

Baby 5 and Buffalo

Caesar knows Baby 5 and Buffalo, and seems to have enough faith in them, believing himself to be saved the moment he saw them battling in the air. Baby 5 seems to know a few things about Ceasar's research, as she knows that Caesar is not interested in human weapons. Despite his confidence in them he decides to abandon them to return to Dressrosa alone after they are defeated, while deriding Buffalo for being unable to protect him.

Kaido

Caesar is responsible for the business Doflamingo has with Yonko Kaido. It is due to Caesar's ability to create SMILES that Kaido is able to make a Devil Fruit army of over 500 Zoan users. Caesar is aware of his importance in Kaido's Zoan army, knowing he is the only one to use the SAD substance and that Kaido will be very angry should anything happen to his SMILE production being halted. It is this very reason that Doflamingo places Caesar to the highest value.

Smiley

Smiley is Caesar's pet. Caesar treats Smiley like a pet and seems to be emotionally attached to it. Caesar told Smiley that he missed it and even started to tear up while talking to him and wanted to tell him many things, even though it does not appear to be capable of understanding it. He apparently does not consider the Smilies to be the real Smiley as he showed little reaction when they appeared during his battle with Luffy. It also seems like he only considers the sentience of the Sara Sara no Mi, Model: Axolotl to be his pet, as he had no problem to destroy Smiley's "body" and told him that he will meet again.

While around other people, he talks about Smiley rather professionally, referring to him as a weapon.

Enemies

Vegapunk

Vegapunk tells Caesar that he is dismissed.

It is stated by Smoker that Caesar was Vegapunk's former colleague and used to have a rivalry with him but Caesar was always considered second best, which might be the main reason for his holding a grudge against him. As all of Caesar's research and inventions include inhumane motives and illegal procedures, Vegapunk eventually dismissed him, which led Caesar to hate Vegapunk even more. Despite this, he showed interest in acquiring Vegapunk's laser system, to the point of wanting to capture Franky for that sole purpose. His production of SAD is also a practical application on the "lineage factor" Vegapunk devised. He also didn't enjoy it when Chopper turn his praise of him to Vegapunk.

Marines

Caesar has a deep grudge against the Marines. Even though he was arrested and imprisoned, he managed to escape. He also carries a bounty. When Caesar is informed about the G-5 Marines’ arrival, he appears to be quite angered and he smiles out of joy when Law gives him Smoker’s heart. Later, he also mentions that he has a machination which involves Smoker and his G-5 subordinates. During his tenure in the organization's employment, Caesar's inhumane experiments already aroused much resentment from his colleagues, while Caesar claimed Sengoku was too soft for fearing his weapons of mass destruction, but believed Sakazuki would desire them.

Straw Hat Pirates

After the Straw Hat Pirates stumbled upon Punk Hazard, Caesar wants them eliminated at all costs as evident when he sent the Yeti Cool Brothers after them; Franky alone struck Caesar's interest, as he wanted the laser system installed in the cyborg's body. Once the Straw Hats learn of the sinister experiments that Caesar has been doing, they aim to capture him with Law's assistance. Luffy and Chopper have gained a deep hatred towards Caesar's cruel treatment towards the children and his men and Chopper dismisses him as a scientist. Despite this, Chopper did heal Caesar's wounds and prohibited Sanji from hurting him further (though Chopper stated he was free to kick him after he was done healing him).

Trafalgar Law

While they were partners, the two of them do not appear to be very open with each other. Caesar has always been cautious towards Law. When Law asked Caesar to allow him to stay on Punk Hazard, Caesar only agreed if Law weakened himself by giving him his heart. After learning about his association with Luffy, Caesar quickly thought Law betrayed him by calling the Straw Hats. He wanted to shoot Law at first, but then decided that Law probably was not responsible for the Straw Hats appearing on the island. He also seems to be unnerved by Law as he was trembling when he pointed a gun at him.

Law, on the other hand, finds some of Caesar's methods to be disgusting, especially his deeds to the children that he kidnapped. Law later betrays Caesar by plotting to capture him with the Straw Hats. Caesar seems to be partially aware of this as he mentions that the Yeti Cool Brothers failed due to Luffy's and Law's strength.

After Law's capture by Vergo, Caesar expressed his disappointment, stating that he was hoping that he and Law would become great friends, before he found out about his betrayal. After his capture, Caesar then mocked Law over his plan to take out the Smile production factory at Dressrosa, calling him and the Straw Hats idiots for defying Doflamingo.

Abilities and Powers

Caesar has authority over all the former test subjects on the island as he saved them from the gas, and he uses their blind-trust to manipulate them. However, after Caesar revealed that he doesn't care about his subordinates, he lost their faith.

Caesar is also shown to be a rather cunning individual, easily facilitating an escape from a Marine battleship escort after he was arrested and then returning to Punk Hazard, as well as ensuring that his affiliate Trafalgar Law would not renege on their partnership by having him use his own "Ope Ope no Mi" to remove his heart and place it in Caesar's safekeeping in exchange for allowing him to stay on Punk Hazard (while also demonstrating an act of goodwill by allowing Law to take the heart of Caesar's secretary Monet himself): this reveals the level of caution Caesar has around other individuals of comparable or greater power than himself. He also quickly aware of the consequences of murdering Vice-Admiral Smoker and his G-5 Marines on site, rather than attempt the process recklessly. He is also was able to escape when he was capture and kept himself hidden for a long while. He also on purposely enraged a partially paralyzed Brownbeard in order to prevent the subordinates present from suspecting him, and have them shoot down Brownbeard without being the wiser.

In direct combat, Caesar has also proven to be a very powerful fighter, using his Devil Fruit abilities to quickly maneuver out of dangerous situations and being durable enough to take several Haki-imbued Gear Second strikes from Luffy, only to emerge relatively unharmed. His durability extends to being seemingly largely unfazed by either the boiling hot or the sub-zero temperatures which compose the "Burning Lands" and the "Ice Lands" zones on Punk Hazard respectively. He withstood a blow from Luffy that left a big dent in his face and still retain consciousness. He is also very stealthy, being able to administer a muscle relaxant to Brownbeard without the latter noticing. Caesar also has the power to combine with Shinokuni and become stronger, after combining if Caesar touches anyone they become petrified.

Scientific Expertise

Caesar is a scientist with immense 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 was able to turn normal humans into giants, a feat that even Vegapunk could not accomplish, though Caesar has resorted to illegal and inhumane methods that Vegapunk considers unacceptable, and the fact that the children used would expire within five years from the continuous experiments, which led the Marines to refuse to acknowledge him to be superior to the head scientist. He also uses the highly restricted drug NHC10, though his authorization on its usage is unknown. He is also in the possession of another unnamed drug, that relaxes muscles and makes it unable for the person, who the drug has been injected into, to talk or stand. All this earned him recognition as the world's leading expert on weapons of mass destruction. 

Derived from his scientific expertise, he holds massively destructive weapons, the most prominent one being a pet slime named Smiley, a mountain-sized lump monster that constantly emits some kind of smoke or vapor and has been "fed" the Sara Sara no Mi, Model: Axolotl (which gave the once inanimate lump life and form), which Caesar would unleash when trespassers become too much of a threat. He can control Slime by using verbal commands.

Caesar is also the only person who knows how to produce a substance called SAD, a rare and valuable substance that is an essential ingredient for the creation of Artificial Zoan Devil Fruits called SMILE, another feat that Vegapunk has failed in. Because of this, Doflamingo values Caesar's work greatly, as he apparently employs the scientist's expertise to cater the military expansion demands of one of the Yonko.

Devil Fruit

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Caesar's gas form.

Caesar has eaten the Gasu Gasu no Mi, a Logia-class Devil Fruit that grants him the ability to change into a vaporous form, allowing him to float and go inside places that no normal solid being can. He was seen demonstrating this ability when hiding inside some beakers when he was informed that the Marines were nearby. Even in his intangible gaseous form, he can become dense enough to hold objects, like his cocktail glass. It is unknown if this is because he can control the density of his gaseous form. He seems to prefer keeping his Devil Fruit ability active, as he is either completely or partly gaseous and has yet to be seen completely solid. Caesar can absorb other gases, and he merged completely with the Shinokuni gas to greatly enhance his size and powers.

Caesar stated that he has done numerous experiments on his power, thus granting his gases poisonous and explosive qualities. He can also remove oxygen in a certain area around himself to nullify fire-based attacks or asphyxiate his opponents.

Weapons

He was seen using a dual-barreled flintlock to threaten Law when he learned of his past associations with Luffy. He was also shown using various weapons in conjunction with his Devil Fruit abilities; like explosive castanets filled with volatile gas called "Gastanets" which he claps together to create a massive explosion, using matches to ignite a gas he calls "Miok Gas" to cause an explosion in the immediate area, and a sword hilt, bearing some similarity to a Bunsen burner, that he concentrates oxygen in to use a technique called "Blue Sword". He also used a syringe to inject a muscle relaxant into Brownbeard stealthily to prevent his underlings' trust from being compromised.

Caesar's flintlock.

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Caesar's "gastanets".

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Caesar's "Blue Sword".

History

Past

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 did not 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 humanitarian.

The truth was Caesar had made the weapon and was responsible for letting it go off 'accidentally' in retaliation for being fired for his reckless behavior and caused the destruction of the environment. 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 destruction that spreads poison gas is illegal and Caesar had been caught and arrested. However, he escaped the prison ship and was never seen or heard from again.

Caesar's Return to Punk Hazard

Caesar Clown's return.

A year after the incident, Caesar Clown returned to the island and used his Devil Fruit ability to purify the gas (though unbeknownst to most, he compressed the gas into a sentient weapon). He also created rudimentary artificial prostheses for those who could not walk and accepted them as his underlings. All of the prisoners that Caesar 'rescued' were unaware that he was the one truly responsible for the incident on the island, which he deemed a resounding success, and came to follow him blindly. 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.

While working on Punk Hazard, Caesar experimented on kidnapped children with plans on turning them into giant soldiers. He told the children that they are ill and that their disease can infect their parents if they do not let Caesar treat it. Afterwards he also told the children, while in tears, that he had a son once, who died from the same disease, which is the reason why he wants to cure it to successfully earn their trust. He also collaborated with the Donquixote Pirates and Kaido of the Yonko to produce SAD, a substance used to create specialized artificial Devil Fruits, which the mighty pirates used to create an army of artificial Zoan-class Devil Fruit users.

Law tells Caesar he wants to stay at Punk Hazard.

When Trafalgar Law came to the island, Caesar formed an alliance with him. He and Caesar had a conversation within the facility with Law stating that he wanted to stay on the island. All he asked for was free roam of the island, and that neither of them ask the other too many personal questions. Law also made it a point that no one was to know that he is staying on the island. Caesar said that he saw no harm in trusting Law, and asked Monet if she agreed. She follows by asking Law if he could heal the prisoners on the island who were paralyzed by the poisonous gas.

Caesar finally agreed to let Law stay on the condition he forms a contract with him to exchange his heart for Monet's heart in order to make it hard for both of them to betray each other should one of them attempt a duplicitous action. He also stated he is the boss of the island and Law should be weaker than him if he wished to stay on the island.

Punk Hazard Arc

The G-5 Marines and the Straw Hat Pirates

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 exterminate the Straw Hats, the G-5 Marines, and Kin'emon while Joker will make it look like an accident at sea. One of the centaurs defeated by Luffy's group then comes 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 hallucinations, and the centaur appears to have them. Caesar is next seen pressing on a button, and an explosion-like sound is heard as he purged the chamber along with the loyal centaur inside, and in the next instant, smoke comes out from a shaking exhaust pipe.

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 and did surveillance on all the victims of that experiment, documenting the effects 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 a heart to Caesar, which supposedly belongs to Smoker. Caesar holds the 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. It was later revealed that he also told them to kill Brownbeard and capture Franky because he possessed the technology of Vegapunk's laser.

When Monet informs Caesar about Law's association with Luffy at Sabaody Archipelago and Marineford, Caesar pulls a pistol on Law and questions him about his relationship to the notable pirate. Law denies having anything to do with the Straw Hats' presence on the island. Caesar then realizes that Law would not betray him, as he would not make things more complicated for them, after becoming a Shichibukai and coming to Punk Hazard. As Caesar is about to leave, Law asks him why the kids would come back, even when left alone. Caesar then proudly presents a candy laced with NHC10 and tells Law that he gave them to the kids, much to Law's disgust. As Law is leaving, Caesar points out that people who think too much are hard to handle.

He then picks up Franky's wanted poster, desiring to capture him in order to acquire Vegapunk's laser system, to which Franky has installed into his own body. Caesar then responded to his subordinates when they asked about the G-5 Marines, allowing his subordinates to take refuge for now while Caesar himself makes preparations, and threatening his subordinates with death if they fail to leave Smoker's brigade alone.

During the fight between his men and the G-5 marines, his men tried to contact him. Caesar predicted that it was just a report that they opened the doors on the Fire Lands and that something came out, as well as pleas for help since the Marines defeat them, so he chose to ignore the call. Since so many people appeared on Punk Hazard, Caesar decided to stop gathering their bodies for his experiments and instead wanted to release his pet, while declaring that he will not let them leave this island. He is later seen telling Monet about the accident four years ago, and how the slime is the accident itself. He explains that he simply compressed the expelled gas into the creature known as Slime.

Confrontation with the Uninvited Guests

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Luffy grabs Caesar upon meeting him.

Caesar is later seen outside the research facility on top of a warship, apologizing for keeping Slime locked up for three years. Smoker then asks him if he is Caesar Clown and Luffy asks him if he is the master, so Caesar answers yes to both questions. He begins to explain that the Slime is throwing itself over the lake and what it is. Before he finishes, he is interrupted by Luffy suddenly grabbing him.

As Luffy is about to attack Caesar with his Gomu Gomu no Kane, Caesar manages to evade his attack by turning into gas. Caesar responds with his Gas Robe attack, daring Luffy to inhale it. Luffy really does inhale it and blows it out of his ears, which surprises Caesar. As Luffy states that poison attacks do not work on him since his encounter with Magellan, Caesar becomes enraged that Luffy compares him to a Paramecia. Luffy quickly strikes Caesar with Jet Mace.

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Caesar stands triumphantly over Smoker, Tashigi, and three of the Straw Hat Pirates.

As Caesar's men want to help Caesar, he tells them to back off and calls them trash. He then stops Luffy from using another attack by using his Gastanet attack, blowing Luffy up. Being delighted by the success of his attack, Caesar orders slime-chunks to attach themselves to Luffy to cause an even bigger explosion. Caesar is then visibly baffled when he sees that Luffy evaded his attack and standing behind him. Before he can react, Luffy slams Caesar onto the ground with a Jet Stamp. As Luffy mounts Caesar and grabs him, he suddenly faints. Caesar emerges victoriously from the battle, stating that Luffy underestimated him.

Caesar is later seen holding an unconscious Smoker. He also defeated Franky, Robin, and Tashigi through an unseen method. The G-5 Marines note that Caesar did not even touch them. Caesar orders his soldiers to restrain the prisoners and to be sure to use Seastone Chains for the Devil Fruit users. He also tells his men that he will provide shelter from the Slime. As he is leaving, Caesar laughs at the fact that Law and Luffy were too much for the Yeti Cool Brothers, thus revealing that he knows of Law's treachery.

Caesar later appears at the Straw Hat Pirates' hiding spot, where Usopp and Nami are having trouble keeping the children under control. Caesar lures the children to him by offering them candy. Usopp and Nami attempt to resist, but Caesar suffocates both of them. A wounded Brownbeard wakes up and tries to get revenge against Caesar for betraying him. Caesar quickly defeats Brownbeard and then returns to the facility with the children. On the way, he contacts all of the underworld dealers to inform them about an upcoming experiment for his chemical mass destruction weapon. Once he returns to the facility, he orders his subordinates to take the children to the biscuits room and make sure that they do not leave again.

Caesar then confronts Law about his treachery. He reminds Law that when he arrived, they made a promise that Caesar would let Law have Monet's heart if Law gave up his heart. So Caesar gave the heart to Vergo, and if Law tries to do anything against Caesar, he could just squeeze Law's heart. Vergo then gives his heart a tiny squeeze, and Law is seen in massive pain. While Caesar mocks Law about the deal he forced him to make when he came to the island, Law just mocks him stating he should have been more cautious of Monet rather than him and calls Caesar stupid which results in Caesar squeezing Law's heart and Law passes out from the agony.

Shinokuni: Weapon of Mass Destruction

Caesar is then seen, still making the video Den Den Mushi broadcast to the brokers, telling his subordinates to set up a giant piece of candy for Smiley to eat. Caesar tells the brokers on the broadcast about the poisonous gas that appeared four years ago after his experiment. He then says he has made a new weapon out of it, and calls it "Shinokuni". When Smiley finally makes it to the food, Caesar is overjoyed on Smiley's arrival, and says he has so much to tell him. When Caesar orders Smiley to wait, Smiley ignores him and quickly eats the bait. Regardless, Caesar is pleased that Smiley is showing some reaction to the candy. Smiley then transforms into a giant cloud of poison. Caesar watches in glee as his fleeing subordinates succumb to the effects of the gas and explains to his captives the power of his weapon of mass destruction. When he sees Zoro's group keeping themselves away from the gas, Caesar comments that they are tough but will eventually get caught.

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Luffy attacks Caesar in their second confrontation.

He then proceeds to send Law, Smoker, Tashigi, and Luffy's group outside of the facility to die. Caesar later realizes his prisoners nor the G-5 Marines were caught in the gas and one of his subordinates reports their escape. Caesar discerns the group is heading for Gate #66 in Building R. He orders the passage between Buildings A and B be sealed off, then to blow hole in the sealed part to let the gas in though wishes for the Den Den Mushi to continue running to show the brokers his scientific work. He is angered when he observes that he did not petrify his intended targets and swears no one will escape. He orders Monet to let gas into the other chamber, saying he is willing to kill Vergo when Monet comments that the gas would petrify Vergo as well.

Suddenly, Luffy and Smoker enter the room Caesar is broadcasting from and Luffy immediately punches Caesar in the stomach, taking Caesar by surprise. Caesar reels from the punch and Luffy initiates the second round of their battle. Caesar demands to know why Luffy is trying to capture him and Luffy explains his role in Law's plan. Caesar admonishes him, warning Law cannot be trusted but Luffy retorts that is for him to decide. The two continue to clash with Luffy landing a few solid hits. Caesar tries to suck the oxygen out of him but Luffy manages to get out of range of the vacuum and attacks from a distance injuring him. Caesar reveals he has other methods of attack such as a flaming blue sword. Luffy manages to avoid the blade and prepares to finish him with a Jet Gatling. However Monet uses her Devil Fruit ability to construct a wall and protect Caesar. On her suggestion, Caesar abandons the battle and departs to try to locate Law, though promises he has a way to make guinea pigs out of Luffy and his allies.

An emergency broadcast is heard from the D Building that Law is in the SAD manufacture room much to Caesar's panic alleging that Law's actions will cause difficulty for the Shichibukai himself. He is later contacted by Donquixote Doflamingo and instructed to return to Dressrosa once Baby 5 and Buffalo arrive as support. Doflamingo also reveals that Caesar is the only person in the world that can create SAD.

Caesar is then seen in the secret room, monitoring the situation inside the facility. He surveys the gas is pouring into Building B due to an explosion caused by the fire created by Vegapunk's smaller dragon. He orders his subordinates to seal the gates to Building C and D to ensure that the intruders go to Building R. Caesar's subordinates ask him to give them permission to fight, but Caesar tells them that it is not necessary and informs them of his strategy to kill their enemies. Caesar goes on feeding lies to his subordinates, telling them that Vegapunk is the one fully responsible for the incident four years ago. While his subordinates cheer for him, he reminisces back to the time he triggered the explosion that caused the disaster.

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Luffy giving Caesar a devastating punch to the face.

Brownbeard later arrives to the first floor of Building R. As Caesar watches him on the monitor, Brownbeard is about to reveal to the soldiers of Punk Hazard about Caesar's true colors. Before he can speak any further, Caesar and his subordinates go down to the first floor to meet him. Upon seeing Caesar, Brownbeard demands him to tell him what happened to his men outside on the island before Shinokuni was released. Caesar merely shrugged and say he did not receive their distress call when in truth he did received it be left them to die outside. Angered by the callous disregard of the lives of his men, Brownbeard tried to reveal Caesar's true nature to the rest of the men protecting their 'generous' master, but Caesar managed to inject a muscle relaxant in Brownbeard making him spurt out gibberish and unable to stand. Now in control of the situation, Caesar whispered to Brownbeard that the poison gas incident was his doing. Brownbeard then furiously tried to attack Caesar, only to be shot down by the subordinates he swore to save. Feeling victorious, Caesar prepares to finish off Brownbeard when Luffy knocks him away with a giant Haki-infused fist.

As Luffy prepares for a third confrontation, Caesar exhorts him that if he attacks him, Joker (i.e. Doflamingo) and a Yonko will hunt him down and gloats that Luffy will never defeat all of them. Luffy, remembering all the horrible things Caesar Clown has done, channeled all his rage into a single punch on the depraved scientist's face, shouting that he has already faced powerful enemies. Caesar warns Luffy again about just who he is dealing with before trying to attack Luffy again with Gastille, a gas burner attack. However, Luffy dodges the beam and punches Caesar in the face again.

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Caesar Clown is defeated by Luffy.

Caesar observes the damage to his base due to Law's attack and is quite upset over it. He orders his troops in the control room to flood the room so the Shinokuni will power him. When they protest that over 100 of his minions are still on the first floor, Caesar finally drops the façade, yelling how they are all his guinea pigs and he does not care how many of them have to perish. The men are aghast at this outburst while Usopp, who was hiding, watches from one of the monitors.

However a few of Caesar's men still remain in denial about Caesar's declaration, thinking it was part of his plan against Luffy and open the vents. When the gas floods in, Caesar absorbs it and grows, ranting manically how a success his experiment was since two "peaceful" countries want to procure his weapon and how he will become the king of the land of death. He then attacks his own men with the Shinokuni, angering Luffy further. Luffy then runs into a hallway, making Caesar think he is running away in cowardice. He chases after the Straw Hat captain and prepares for a final assault as Luffy charges at him with a Gear Third attack.

The attack not only sends Caesar through the gate to the escape passage but also sends him crashing into a tanker outside of the lab. Caesar has been knocked out and his unconscious body is soon found by Buffalo and Baby 5.

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Caesar stabs Monet's heart, believing it to be Smoker's.

During their battle with Franky, Caesar is awoken by Baby 5's explosion. Caesar believes himself to be close to death but remembers that Law gave him Smoker's heart and decides to take Smoker down with him. While he considers to kill Smoker, he sees Baby 5 and Buffalo fighting in the sky, which relieves him, knowing that they will rescue him. He then stabs the heart, but unknowingly kills Monet instead, as Law had covertly returned her heart to Caesar instead of Smoker's.

After Franky repels Buffalo and Baby 5 with General Cannon, the other Straw Hats, the G-5 Marines, and the children reach the outside via a rail car. When Usopp and Nami help finish off Buffalo and Baby 5, Caesar attempts to escape but Usopp catches him with seastone handcuffs.

Aftermath

While everyone was having a party and a feast, the G-5 Marines forced Caesar to explain how to neutralize the gas. As he was brought before Smoker, Caesar was surprised to see the vice admiral alive. The alliance of the Straw Hat Pirates and Heart Pirates then took him as a hostage. During Law's negotiation with Doflamingo via a Den Den Mushi, Caesar was heard begging Doflamingo to save him.

As the Straw Hats and Law discuss on their next plan, Caesar taunts them by saying that their actions will cause them to become targets for all of the big shots in the New World and exclaimed that he never met a large group of idiots in his life like them. Sanji interrupted him by beating him up. Chopper comically got angry at Sanji for beating Caesar up while he is still taking care of Caesar's injuries.

When the Straw Hats discovered that Caesar is the man responsible for the SMILE production, he blushed at Chopper's awe but then became angry when they realized Vegapunk originally discovered it, causing Caesar to lash out that they cannot manufacture SAD like he can. The next morning, when Caesar learned that Doflamingo acquiesced to Law's demands and resigned from the Shichibukai, he burst into tears, seeing how far Doflamingo would go for his sake.

Dressrosa Arc

Law contacted Doflamingo to discuss the next part of the negotiation. Law allowed Caesar to speak so Doflamingo can confirm his safety. Caesar deeply apologized to Doflamingo for getting captured and being used as leverage.

After arriving at Dressrosa, the crew splits into three teams. The group responsible for delivering Caesar to Green Bit consists of Law, Usopp, and Robin.

Major Battles

• Caesar vs. Monkey D. Luffy (Outside the research facility)
• Caesar vs. Smoker (in Tashigi's body), Tashigi (in Smoker's body), Nico Robin, and Franky
• Caesar vs. Nami (in Sanji's body), Usopp, and Brownbeard
• Caesar vs. Monkey D. Luffy (in Caesar's office)
• Caesar and Subordinates vs. Brownbeard
• Caesar vs. Monkey D. Luffy (R Block 1st Floor)

Translation and Dub Issues

In Chapter 663, his name is spelled as "Caesar Clown" which takes the place of the hiragana, as seen in Smoker's monologue. However, in Volume 68 and Volume 69's character introduction, it is spelled as "Caesar Crown".

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.
• In his first appearances his coat did not show "GAS" written twice on the front as it does in Chapter 666 and Chapter 671.
• He is, so far, the only Devil Fruit user who seems to keep his Logia Devil Fruit active all the time, giving him his gaseous appearance.
• He shares many traits with Indigo. They both possess the scientist profession (even if he's a pirate), the clown theme (Indigo in the appearance and attitude) and the Seiyu.

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