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Description
Caesar Clown, who was referred to as "Master" by his subordinates, is a scientist, and a former colleague of Vegapunk; both on the research team MADS and with the World Government. He is the primary antagonist of the Punk Hazard Arc and the first main antagonist the Straw Hats face in the New World. He is the leading expert on chemical weapons of mass destruction and has a bounty of 300,000,000 on his head. During the Dressrosa Arc, Donquixote Doflamingo declared Caesar to be his direct subordinate, and thus protected from the law. Upon Doflamingo's defeat and arrest, this protection was lost, and Caesar's criminal status was once again operational in full. After a period as a hostage of the Straw Hat-Heart Pirate Alliance, he fell into the custody of Big Mom after Capone Bege retrieved and escorted both him and Sanji to Whole Cake Island. He was later liberated by the Fire Tank Pirates and took part in the assassination attempt against Big Mom. Following the plan's failure and disbandment of the alliance, he was finally given back his heart and parts ways with his former captors. However, he failed to escape Whole Cake Island on his own and later assisted Vinsmoke Reiju and Ichiji in freeing Niji and Yonji, escaping with them to the Germa Kingdom before the Vile Familia retrieved him from the Vinsmokes in order to have him work for them.

A very cruel, arrogant, scheming, sinister, and overall 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 or crippling most of its inhabitants and destroying its environment, having sold or created 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 do not run away, and trying to murder everyone on Punk Hazard (Trafalgar Law, the Straw Hats, Smoker's Marines, the children, and his own blindly following 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 also demonstrates tendencies of egomania when Luffy mentioned his Gas-Gas Fruit had no effect on his immune system due to Magellan's Poison-Poison Fruit, 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. Caesar takes utmost pride in the biological weapons he created. Proud of the unexpected power of his Koro gas weapon, he was rather unhappy when the Straw Hat Pirates forced him to counter it to save the poisoned Mink Tribe. He was extremely excited when the Fire Tank Pirates used his KX Launchers in their attempt to assassinate Big Mom and was frustrated when the Emperor easily destroyed his weapons simply by screaming. 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 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 also 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 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 five years time 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 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 to be able to act or lie on several occasions, often being seen feigning emotions when lying to his subordinates and to 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, leading them to believe that Vegapunk was responsible for the Punk Hazard explosion four years ago. 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 the upper hand against Luffy during their last fight, Caesar lost his composure and ordered his subordinates to let in the Shinokuni gas, while outwardly exclaiming that they can easily be replaced. He then goes as far as personally killing the ones present simply to test out his newly acquired power, revealing his true colors in the process. 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 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 eating the candy despite Caesar saying to wait Caesar said it was alright while Monet noted he was not listening to him. Despite his pride, Caesar is capable of knowing when a task is beyond his capabilities, as when Big Mom commissioned him to turn her family into giants, Caesar knew that the task was impossible despite his own view of himself. He also does not take kindly to insults, when Law called him stupid, Caesar lashes out by punching Law's heart. Similarly, when Bege called him an idiot, Caesar angrily corrected Bege by saying he is a genius. 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, often doing a comical face fault, such as when Luffy survived his second Gastanet attack and appeared behind him unharmed. 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 cried in fear right before he was sent flying by Luffy's Gear 3 attack. Caesar is also very cowardly when his life is threatened in any way. When he was about to lose to Luffy he attempted to beg the Straw Hat captain to spare him and even make him his subordinate. He also repeatedly begged Doflamingo to save him and even later begged the Straw Hats to protect him from Big Mom on more than one occasion. While Caesar does at least attempt to fulfill commissions made by other people, he is not averse to giving up on them and will abuse his money and privileges on a hedonistic lifestyle of women and alcohol instead, especially if the projects given to him are proven to be too difficult, if not impossible, to accomplish (i.e. gigantification). He would even continue to lie to his investor in order to embezzle more money for such purposes. When he was under Doflamingo's protection, Caesar did not care about what he did to other people because he viewed himself as safe from them, even from that of an Emperor. Upon losing Doflamingo to the Marines, however, Caesar came to fear the consequences, especially since one of his clientele is none other than Charlotte Linlin, one of the Four Emperors, and he became desperate with lies and thoughts of escaping, even admitting (to himself) that the given project was outright beyond his own limits (which he normally was so arrogant about). However, Caesar's prideful and arrogant attitude can at the very least be scratched, as he started crying in anger when Nami and Chopper referred to him as "human scum" and "the worst" during the operation to ruin Big Mom's Tea Party. He has a distinct laugh of "Shurororororo". He does have standards as he finds Ruth to be revoluting even by his standards and did admire Cutty Vegapunk before he died.

While he is a skilled scientist, he pales in comparison to either Vegapunk. He has Advanced Observation/Armament Haki, Gas/Wind Nature Haki, and Injustice Haki. He ate the Gas-Gas Fruit, which allows him to turn into any kind of chemical gas which can be used in various ways- being very poisonous and/or highly combustible, taking away oxygen from the immediate area to weaken fire users/cause the enemies to asphyxiate. He can absorb other gases, causing him to greatly grow in size, as well as take on the properties of said gas. When he is in his gaseous form, he is able to fly and enter places that no normal solid being can. He can generate a destructive gas beam that can incinerate metal. His Awakening- Devil-Devil: Miasma, increases the effectiveness of his powers, allowing him to evaporate liquids into gases for him to use, cause greater combustible explosions, condense gases into a liquid form to attack targets to potentially nullify the powers of other Devil Fruit users, generate helium in targets to make them float, cause oxygen poisoning, generate miasma, generate tear gas, generate chlorine, generate carbon dioxide to potentially freeze targets, generate hydrogen, etc.

With this power, he can utilize pneumatics, the science involving the application of gas pressure to enable mechanical processes. When gas is put through intense pressure, it can generate kinetic energy. The higher the pressure, the greater the amount of energy that is produced. Through specialized processes, one can harness that kind of energy to perform various forms of work. While it can be utilized in sciences like engineering and chemistry, it is often found in different types of technology. Pneumatic tools can include jackhammers, nail guns and even paint sprayers.

He uses a variety of weapons- 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 red and blue 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.

It's implied he has Oni lineage, hence his capacity to recover and being slightly tougher than normal humans.

Description
Caesar Clown, who was referred to as "Master" by his subordinates, is a scientist, and a former colleague of Vegapunk; both on the research team MADS and with the World Government. He is the primary antagonist of the Punk Hazard Arc and the first main antagonist the Straw Hats face in the New World. He is the leading expert on chemical weapons of mass destruction and has a bounty of 300,000,000 on his head. During the Dressrosa Arc, Donquixote Doflamingo declared Caesar to be his direct subordinate, and thus protected from the law. Upon Doflamingo's defeat and arrest, this protection was lost, and Caesar's criminal status was once again operational in full. After a period as a hostage of the Straw Hat-Heart Pirate Alliance, he fell into the custody of Big Mom after Capone Bege retrieved and escorted both him and Sanji to Whole Cake Island. He was later liberated by the Fire Tank Pirates and took part in the assassination attempt against Big Mom. Following the plan's failure and disbandment of the alliance, he was finally given back his heart and parts ways with his former captors. However, he failed to escape Whole Cake Island on his own and later assisted Vinsmoke Reiju and Ichiji in freeing Niji and Yonji, escaping with them to the Germa Kingdom before the Vile Familia retrieved him from the Vinsmokes in order to have him work for them.

A very cruel, arrogant, scheming, sinister, and overall 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 or crippling most of its inhabitants and destroying its environment, having sold or created 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 do not run away, and trying to murder everyone on Punk Hazard (Trafalgar Law, the Straw Hats, Smoker's Marines, the children, and his own blindly following 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 also demonstrates tendencies of egomania when Luffy mentioned his Gas-Gas Fruit had no effect on his immune system due to Magellan's Poison-Poison Fruit, 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. Caesar takes utmost pride in the biological weapons he created. Proud of the unexpected power of his Koro gas weapon, he was rather unhappy when the Straw Hat Pirates forced him to counter it to save the poisoned Mink Tribe. He was extremely excited when the Fire Tank Pirates used his KX Launchers in their attempt to assassinate Big Mom and was frustrated when the Emperor easily destroyed his weapons simply by screaming. 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 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 also 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 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 five years time 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 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 to be able to act or lie on several occasions, often being seen feigning emotions when lying to his subordinates and to 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, leading them to believe that Vegapunk was responsible for the Punk Hazard explosion four years ago. 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 the upper hand against Luffy during their last fight, Caesar lost his composure and ordered his subordinates to let in the Shinokuni gas, while outwardly exclaiming that they can easily be replaced. He then goes as far as personally killing the ones present simply to test out his newly acquired power, revealing his true colors in the process. 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 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 eating the candy despite Caesar saying to wait Caesar said it was alright while Monet noted he was not listening to him. Despite his pride, Caesar is capable of knowing when a task is beyond his capabilities, as when Big Mom commissioned him to turn her family into giants, Caesar knew that the task was impossible despite his own view of himself. He also does not take kindly to insults, when Law called him stupid, Caesar lashes out by punching Law's heart. Similarly, when Bege called him an idiot, Caesar angrily corrected Bege by saying he is a genius. 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, often doing a comical face fault, such as when Luffy survived his second Gastanet attack and appeared behind him unharmed. 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 cried in fear right before he was sent flying by Luffy's Gear 3 attack. Caesar is also very cowardly when his life is threatened in any way. When he was about to lose to Luffy he attempted to beg the Straw Hat captain to spare him and even make him his subordinate. He also repeatedly begged Doflamingo to save him and even later begged the Straw Hats to protect him from Big Mom on more than one occasion. While Caesar does at least attempt to fulfill commissions made by other people, he is not averse to giving up on them and will abuse his money and privileges on a hedonistic lifestyle of women and alcohol instead, especially if the projects given to him are proven to be too difficult, if not impossible, to accomplish (i.e. gigantification). He would even continue to lie to his investor in order to embezzle more money for such purposes. When he was under Doflamingo's protection, Caesar did not care about what he did to other people because he viewed himself as safe from them, even from that of an Emperor. Upon losing Doflamingo to the Marines, however, Caesar came to fear the consequences, especially since one of his clientele is none other than Charlotte Linlin, one of the Four Emperors, and he became desperate with lies and thoughts of escaping, even admitting (to himself) that the given project was outright beyond his own limits (which he normally was so arrogant about). However, Caesar's prideful and arrogant attitude can at the very least be scratched, as he started crying in anger when Nami and Chopper referred to him as "human scum" and "the worst" during the operation to ruin Big Mom's Tea Party. He has a distinct laugh of "Shurororororo". He does have standards as he finds Ruth to be revoluting even by his standards and did admire Cutty Vegapunk before he died.

While he is a skilled scientist, he pales in comparison to either Vegapunk. He has Advanced Observation/Armament Haki, Gas/Wind Nature Haki, and Injustice Haki. He ate the Gas-Gas Fruit, which allows him to turn into any kind of chemical gas which can be used in various ways- being very poisonous and/or highly combustible, taking away oxygen from the immediate area to weaken fire users/cause the enemies to asphyxiate. He can absorb other gases, causing him to greatly grow in size, as well as take on the properties of said gas. When he is in his gaseous form, he is able to fly and enter places that no normal solid being can. He can generate a destructive gas beam that can incinerate metal. His Awakening- Devil-Devil: Miasma, increases the effectiveness of his powers, allowing him to evaporate liquids into gases for him to use, cause greater combustible explosions, condense gases into a liquid form to attack targets to potentially nullify the powers of other Devil Fruit users, generate helium in targets to make them float, cause oxygen poisoning, generate miasma, generate tear gas, generate chlorine, generate carbon dioxide to potentially freeze targets, generate hydrogen, etc.

With this power, he can utilize pneumatics, the science involving the application of gas pressure to enable mechanical processes. When gas is put through intense pressure, it can generate kinetic energy. The higher the pressure, the greater the amount of energy that is produced. Through specialized processes, one can harness that kind of energy to perform various forms of work. While it can be utilized in sciences like engineering and chemistry, it is often found in different types of technology. Pneumatic tools can include jackhammers, nail guns and even paint sprayers.

He uses a variety of weapons- 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 red and blue 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.

It's implied he has Oni lineage, hence his capacity to recover and being slightly tougher than normal humans.