Caesar Clown

Caesar Clown, also referred to as "Master" (M（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 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 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) and a pair of diagonally striped overalls underneath. He also wears dark purple gloves with the initials "CC" in white on them. Under his coat, he wears a yellow shirt and pants which are striped cross with orange lines.

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

Personality
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. It was stated by Smoker that he was one "crazy bastard".

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.



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, implying at a superiority complex. 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.

Caesar has an odd habit of being easily shocked by things that leave him dumbfounded such as when Luffy survived his second gastonet 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.

He also demonstrates tendencies of a superiority complex 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 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 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".

Subordinates
Brownbeard and the other centaurs think of him as a kindhearted savior 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 Caesar to God and believes that Caesar continues his research for the good of mankind.

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. Even when his subordinates offered to help him during his fight 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.

Caesar seems to recognize the Yeti Cool Brothers’ strength as he ordered them to take care of the Straw Hats. The Yeti Cool Brothers are loyal to Caesar, as they follow his orders without question. Caesar also excused the Yeti Cool Brothers’ failure by saying that fighting against Law and Luffy was too much.

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 job 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.

Vergo
Caesar also has an association with Vergo due to the latter being a subordiante 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.

However, Caesar has no regard about Vergo, as when Caesar is about to eradicate 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
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. However, he seems to value Caesar enough to threaten Monet with death if she let anything happen to him.

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.

Vegapunk
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. He also used the method of "feeding" Zoan-class Devil Fruits to an inanimate object, devised by Vegapunk, to create his pet Smiley.

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.

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 connection to 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.

Abilities and Powers
Caesar has authority over all the former test subjects on the island as he saved them from the gas.

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 fellow inhabitant 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.

In direct combat, Caesar has also proven to be capable of handling himself, 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.

Scientific Expertise
Caesar is a scientist with 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 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.

Derived from his scientific expertise, he holds mass murder 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 valuable substance with unknown properties.

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, allowing him to float and go inside places that no normal solid being can. He was seen demonstrating this ability when hiding inside some flasks 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 has also insinuated that he can absorb other gases.

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 finally a sword hilt, bearing some similarity to a bunsen burner, that he concentrates oxygen in to use a technique called "Blue Sword".

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 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 Caesar had made the weapon and was responsible for letting it go off 'accidentally' in retaliation for being fired for his reckless behavior. 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 Caesar had been caught and arrested. However, he detonated the experiment that led to the destruction of the environment, and then escaped the prison ship 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 Devil Fruit ability to purify the gas. He also created artificial prostheses for those who could not walk and accepted them 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.

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 Caeser 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.



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.

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 Kinemon 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 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 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 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. 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


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.



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, Luffy 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 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.

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.



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 kill 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 kill 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 powers and attack from a distance. Caesar reveals he has other methods of attack such as a flaming blue sword. Luffy manages to avoid him and prepares to finish him with a Jet Gatling. However Monet uses some kind of power to make a wall and protect Caesar. On her suggestion, Caesar abandons the battle and leaves 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 dismay alleging that Law's actions will cause difficulty for the Shichibukai himself. He is later contacted by Donquixote Doflamingo and told to return to Dressrosa once Baby 5 and Buffalo arrive. 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.

Major Battles

 * Caesar Clown vs. Monkey D. Luffy (Outside the facility)
 * Caesar Clown vs. Smoker (in Tashigi's body), Tashigi (in Smoker's body), Nico Robin, and Franky
 * Caeser Clown vs. Nami (in Sanji's body), Usopp, and Brownbeard
 * Caesar Clown vs. Monkey D. Luffy (Inside Caesar's lab)

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 also, so far, the only Devil Fruit user who seems to keep his Logia Devil Fruit active all the time, giving him his gaseous appearance.

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