"Massacre Soldier" Killer is a pirate from the South Blue and a member of the Kid Pirates. He is one of twelve pirates who are referred to as the "Worst Generation" After the timeskip, his bounty has been raised from Beli162,000,000 to Beli200,000,000. Following the confrontation with Kaido, unknown events occurred, leading to Killer eating a defective SMILE and taking on the alias of Kamazo the Manslayer, a street murderer in Wano Country who secretly acted as an assassin working for the shogun, Kurozumi Orochi, until the shogun discarded him after he failed his mission to kill Toko. Killer is a tall, muscular man. He has long wild blonde hair that reaches down to his thighs. He wears a plain, white and light-blue striped full-head helmet with many rows of holes in it, and what look like modern headphones on both sides. He also wears a black shirt with white polka-dots and an open collar that shows his chest, with blue riding chaps over his pants. Additionally, Killer has a red sash around his waist. He carries a pair of handguards which have very long detachable scythes connected to them. When not fighting, these scythes are placed in a large sheath tied to his right hip.
In an SBS Volume 64, Oda drew the Supernovas as children. Killer is shown as a kid with a wavy hair that covered his eyes with a plain t-shirt, pants and shoes, eating a plate of noodles. This makes a reference to SBS Volume 62, that Oda stated that Killer, as an adult, prefers to consume food that can pass through the holes of his mask, such as stick-shaped ones and ramen. After the timeskip, Killer is shown as more muscular and with a thicker neck. He has grown a goatee and is shown to have a prominent scar on his left arm. His hair is shorter, now only reaching down to his back. He has changed his attire after the two year timeskip to a blue t-shirt with his customized Jolly Roger on. Under the guise as Kamazo the Manslayer, Killer lost his mask and has bandages covering most of his face. His hair is kept bound, and he wears a dark kimono with sickle-shaped patterns placed on it irregularly, as well as an obi around his waist and a cape that both have target patterns on them. By the time of the Fire Festival, Killer regained his mask.
Like the rest of Kid's crew, Killer comes across as both mildly arrogant and level-headed; in the latter case, probably more so than their captain. Of course, this does not mean he is not as enticed toward violence as anybody else on the crew. He also remains fairly silent during combat, save for the slicing of his blades, and tends to focus on the elimination of his enemies. Killer is more knowledgeable than his captain in terms of historical facts, as shown when he informed Kid the meaning of the Ox Bell. After the timeskip, Killer has been shown to be much calmer than his captain, advising him to be polite when meeting with his fellow Supernovas, and was then able to prevent a fight between him and Scratchmen Apoo from escalating while reminding them of the purpose of their meeting. He also seems to be more reasonable than his captain, which is in contrast to his name, as he tried to reason things out rather than immediately trying to start a fight. After eating a faulty SMILE fruit, Killer lost the ability to express negative emotions and is now only able to smile and laugh. After taking on the alias Kamazo, he displays the traits of a violent man who takes pleasure in killing. If he encounters someone whom he has not been ordered to kill, he will give them the chance to get out of his way, but will kill anyone who stands between him and his target without issue. He is very confident in his abilities, constantly taunting his opponents and being sure that they will lose to him. As someone who worked for Orochi, "Kamazo" held the shogun in high regard and would get mad if anyone referred to the shogun in an impolite manner. Like many other people, he has a unique laughter style: "Faffaffaffa". According to Kid, Killer hates his own laugh to the point of stopping himself from doing so ever since. Moreover, he also hates people laughing at his laugh and is willing to kill them for it.
Killer is a fearsome pirate and combatant. His skills have earned him a bounty of Beli200,000,000 which is considered to be very impressive for a rookie, even within the Grand Line. Like his captain, he was able to resist Rayleigh's burst of Haki. Killer's style of fighting seems to rely mainly on agility and speed, which he uses to overpower his opponent before they can strike him, or to dodge attacks. He was capable of fighting head on with Urouge at Sabaody Archipelago and with Roronoa Zoro at Wano Country. After eating a failed SMILE, Killer lost his ability to swim. Killer is seen using a pair of scythe-bladed weapons attached to his armbands that are capable of spinning around or being used as hand scythes. These weapons can also be used to block other weapons, leaving the foe open for Killer to kick the enemy's flank or other exposed areas. This, combined with the agility he has so far displayed in combat and the notion that he is not afraid to kill, makes him a formidable foe. As Kamazo, Killer used two regular scythes but lost them after he was defeated by Zoro. Killer knew Eustass Kid since they were children. One day, they ate curry udon with their first love, Shiruton Doruyanaika. They laughed when she spilled curry broth all over herself while eating it, causing her to beat them up. This caused curry udon to become their least favorite food. According to Kid, Killer hated his own laugh so much that he beat up anyone who made fun of it. He eventually stopped laughing at all and started to wear a mask to hide his face. After a long voyage following one of the Log Pose routes of the Grand Line, Kid and his crew came to the Sabaody Archipelago to prepare themselves for the New World. Killer fight with Urouge was broken up by X Drake. He later rejoined with his captain at the Human Auctioning House, to observe the auction taking place. After interruptions caused by Monkey D. Luffy, Killer found himself fighting to escape alongside Trafalgar Law's and Luffy's crews, in the face of a daunting Marine attack. During the battle, Luffy remarked how he will be the one to find the great treasure One Piece, Kid responded to this statement by ceasing current fighting, and facing Luffy. After a brief recollection between the captains, on how their journey was met with laughter and dismissal at their crews' dreams, on their route along the Grand Line, the crew escaped together.
In an SBS Volume 64, Oda drew the Supernovas as children. Killer is shown as a kid with a wavy hair that covered his eyes with a plain t-shirt, pants and shoes, eating a plate of noodles. This makes a reference to SBS Volume 62, that Oda stated that Killer, as an adult, prefers to consume food that can pass through the holes of his mask, such as stick-shaped ones and ramen. After the timeskip, Killer is shown as more muscular and with a thicker neck. He has grown a goatee and is shown to have a prominent scar on his left arm. His hair is shorter, now only reaching down to his back. He has changed his attire after the two year timeskip to a blue t-shirt with his customized Jolly Roger on. Under the guise as Kamazo the Manslayer, Killer lost his mask and has bandages covering most of his face. His hair is kept bound, and he wears a dark kimono with sickle-shaped patterns placed on it irregularly, as well as an obi around his waist and a cape that both have target patterns on them. By the time of the Fire Festival, Killer regained his mask.
Like the rest of Kid's crew, Killer comes across as both mildly arrogant and level-headed; in the latter case, probably more so than their captain. Of course, this does not mean he is not as enticed toward violence as anybody else on the crew. He also remains fairly silent during combat, save for the slicing of his blades, and tends to focus on the elimination of his enemies. Killer is more knowledgeable than his captain in terms of historical facts, as shown when he informed Kid the meaning of the Ox Bell. After the timeskip, Killer has been shown to be much calmer than his captain, advising him to be polite when meeting with his fellow Supernovas, and was then able to prevent a fight between him and Scratchmen Apoo from escalating while reminding them of the purpose of their meeting. He also seems to be more reasonable than his captain, which is in contrast to his name, as he tried to reason things out rather than immediately trying to start a fight. After eating a faulty SMILE fruit, Killer lost the ability to express negative emotions and is now only able to smile and laugh. After taking on the alias Kamazo, he displays the traits of a violent man who takes pleasure in killing. If he encounters someone whom he has not been ordered to kill, he will give them the chance to get out of his way, but will kill anyone who stands between him and his target without issue. He is very confident in his abilities, constantly taunting his opponents and being sure that they will lose to him. As someone who worked for Orochi, "Kamazo" held the shogun in high regard and would get mad if anyone referred to the shogun in an impolite manner. Like many other people, he has a unique laughter style: "Faffaffaffa". According to Kid, Killer hates his own laugh to the point of stopping himself from doing so ever since. Moreover, he also hates people laughing at his laugh and is willing to kill them for it.
Killer is a fearsome pirate and combatant. His skills have earned him a bounty of Beli200,000,000 which is considered to be very impressive for a rookie, even within the Grand Line. Like his captain, he was able to resist Rayleigh's burst of Haki. Killer's style of fighting seems to rely mainly on agility and speed, which he uses to overpower his opponent before they can strike him, or to dodge attacks. He was capable of fighting head on with Urouge at Sabaody Archipelago and with Roronoa Zoro at Wano Country. After eating a failed SMILE, Killer lost his ability to swim. Killer is seen using a pair of scythe-bladed weapons attached to his armbands that are capable of spinning around or being used as hand scythes. These weapons can also be used to block other weapons, leaving the foe open for Killer to kick the enemy's flank or other exposed areas. This, combined with the agility he has so far displayed in combat and the notion that he is not afraid to kill, makes him a formidable foe. As Kamazo, Killer used two regular scythes but lost them after he was defeated by Zoro. Killer knew Eustass Kid since they were children. One day, they ate curry udon with their first love, Shiruton Doruyanaika. They laughed when she spilled curry broth all over herself while eating it, causing her to beat them up. This caused curry udon to become their least favorite food. According to Kid, Killer hated his own laugh so much that he beat up anyone who made fun of it. He eventually stopped laughing at all and started to wear a mask to hide his face. After a long voyage following one of the Log Pose routes of the Grand Line, Kid and his crew came to the Sabaody Archipelago to prepare themselves for the New World. Killer fight with Urouge was broken up by X Drake. He later rejoined with his captain at the Human Auctioning House, to observe the auction taking place. After interruptions caused by Monkey D. Luffy, Killer found himself fighting to escape alongside Trafalgar Law's and Luffy's crews, in the face of a daunting Marine attack. During the battle, Luffy remarked how he will be the one to find the great treasure One Piece, Kid responded to this statement by ceasing current fighting, and facing Luffy. After a brief recollection between the captains, on how their journey was met with laughter and dismissal at their crews' dreams, on their route along the Grand Line, the crew escaped together.