Mayuri Kurotsuchi

"Researcher with killing intent." - Tite Kubo

is Captain of the 12th Division in the Gotei 13 and 2nd president of the Shinigami Research Institute. His lieutenant is Nemu Kurotsuchi, his artificially-created "daughter".

Appearance
Mayuri's appearance has a very skeletal look to it with a skull-like visage. His fingernails are blue and, with the exception of the fingernail on his right middle finger, are all short. The one long fingernail is as long as the finger itself. Mayuri is revealed to have blue hair and golden brown eyes when without make-up. He also wears a white hat with two ends that point to his right and a large purple scarf around his neck. His whole body, even his face and hands, has been painted black and white. He repaints his make-up every morning, as he always removes it before going to bed.

Mayuri has performed various experiments on himself, some of which include upgrading certain body parts to function as weapons or giving him otherwise useful abilities. To escape situations in which he risks defeat, Mayuri uses a technique in which he stabs himself with his Zanpakutō, transforming his body into a liquid blob-like entity, which is incapable of fighting but impervious to harm. He is later able to reconstitute himself, at which point his wounds are healed. His physical modifications also appear to be undone each time he reconstitutes himself, although he is heavily scarred and his ears appear to be permanently removed. Reconstituting himself from a liquid also requires him to repaint his make-up.

Mayuri's looks have changed since his last appearance: his ear attachments have become shorter and rounder, his chin has a longer attachment (much like the beard of an Egyptian Pharaoh), and he no longer wears a hat. His hair is also styled into "horns," which when viewed from the front looks much like a Pharaoh's crown, and his face paint has been patterned differently.

Personality
Mayuri Kurotsuchi is a researcher and personifies the stereotype of the mad scientist. By his early actions during the Ryoka Invasion, he is displayed as one of the most sadistic and cruel Shinigami. He sees everyone and everything not as a living being, but as an object to be researched—including himself. He has little respect or regard for most others, and was even willing to turn his own men (who were not aware of his plans) into living bombs in an attempt to capture Uryū Ishida and Orihime Inoue for experimentation. He also withheld vital information about the Bounts from the other Shinigami in order to capture one as a research subject for himself.

It is known that Mayuri's favorite food is pike fish, while he does not like onion. One of his free-time activities is reading every character published in Seiretei Communication. He himself publishes a serialization in the journal, titled "Effective Medication for the Brain", which apparently contains detailed instructions on preparation of medicine and their application. Surprisingly it is highly popular among the readers.

In battle, Mayuri likes to play with his opponent, torturing them little by little until they can hardly stand. This was shown with both Uryū and his Espada counterpart Szayel. Every time he fights he uses it as an experiment testing himself and his opponent little by little. He also uses it to transplant microbes or other things in case they get away. Before engaging, though, he will make extensive research on his possible opponents to tilt the chance of winning to his side. It is seen that, before the Winter War, he is busy reading in the library with a note on the door saying, "Enter and Die." He's been doing this every time he fights, against the Bounts and Espada.

History
Little is known about the early history of Mayuri, except that 110 years ago he was the only prisoner in the Maggot's Nest who was considered dangerous enough to necessitate confinement in a small prison cell, chained to the wall by his ankle. He would however one day be visited by Kisuke Urahara who was seeking his genius to become vice-president in the newly thought-of Shinigami Research and Development Institute, something that would automatically get him out of there. At first Mayuri refused, until Kisuke began teasing him with the fact that he had nothing to tinker with down there and that as vice-president he would inherit everything should something happen to Urahara.

9 years later Mayuri is seen with Kisuke Urahara and Hiyori Sarugaki walking through the Seireitei when they are greeted by 5th Division captain Shinji Hirako and his lieutenant Sōsuke Aizen. Mayuri shows a distaste for Shinji as as he refuses to call Mayuri by his full name and only calls him by his first, which is too familiar for Mayuri's liking. He seemingly is uninterested in the conversation between Urahara and Aizen who explaining that the 9th Division has been sent on a special investigation to find out what is happening with the disappearances in the Rukongai.

During her brief time as a member of the institute, Hiyori served as a lab manager, which clashing with Mayuri who was then 3rd Seat & Vice-President of the Shinigami Research and Development Institute, over who has more authority under the Captain. The two constantly got into a ongoing argument about whose in charge prompting Hiyori to call in Urahara. He explains to her that with the disappearances occurring he has created a new type of gigai. Before Hiyori can respond they are interrupted by the arrival of Todo the 6th Seat of the 9th Division. Urahara agrees to send a researcher over to the investigation site as per the request of captain Kensei Muguruma of the 9th Division. Urahara elects Hiyori to go to the site, to which she become irate and asks why cant he send someone less important, referring to lab assistant Akon. He questions if she should continue being a lieutenant prompting Hiyori to attack him though he simply dodges her. Though reluctant Hiyori gives in once Urahara explains that she is the only one that he can trust with the task.

After an incident that got Urahara and Tessai Tsukabishi banished and several captains and seated officers Hollowfied, he later succeeded Urahara in leading the Research and Development Institute as well as somehow becoming captain of the 12th Division of the Gotei 13.

He also experimented on Quincy, including Sōken Ishida, Uryū's master and grandfather, in his studies. He believed that upon Sōken Ishida's death the Quincy had been entirely wiped out, and was disappointed to learn that Uryū was a Quincy because he considered his study of the Quincy complete and did not want any further Quincy specimens.

Soul Society arc
At a meeting of the thirteen division captains is called for so that Gin Ichimaru can explain his suspicious actions. Gin, being one of the thirteen captains, should have had no trouble destroying them. Gin merely chalks it up to a mistake on his part. Though Mayuri and Kenpachi Zaraki argue over the possibility of him purposefully letting them go, which grows into a argument between the two until they are silenced by Captain-Commander Yamamoto.

During the Ryoka Invasion of Soul Society, Mayuri attempts to search for the Ryoka and use them as test subjects. During the search, Mayuri tries to give a unsanctioned interrogation to Ikkaku Madarame while he is healing in the 4th Division headquarters. When Ikkaku refuses to tell him the details of his fight. Disturbed that Ikkaku has nothing to offer as far as information he states that he will need to be punished for his behavior. Though Mayuri is promptly stopped by Zaraki who asks him since when does he have authority over the members of other divisions. Mayuri quickly leaves.

He eventually meets up with Uryū Ishida and Orihime Inoue, whom he tries to capture using his own squad members as bombs. After Mayuri blows up the last of his men he sees Orihime's Santen Kesshun technique has protected her and Ishida from the blast. Ishida turn his sights on Mayuri, who is now interested in studying Orihime because of her shield, asking if she would like to be his research subject. Mayuri undeterred by Ishida continues to add incentives to Orihime to become his subject by issuing offers he normally wouldn't. Mayuri then notices Ishida standing next pointing a bow at him, and tells him that he is pretty fast for a Quincy. Mayuri then states that they are a rare breed and he hasn't seen one alive for many years, but he notes that he has no interest in the Quincy as he finished studying their kind some time ago. This causes Ishida to question who he is, Mayuri is taken aback at the idea that Ishida and his friends would invade Soul Society without doing their homework and at the very least they should know who the Gotei 13 captains where. Mayuri then gives his name, rank and position, realizing what they are up against Ishida to tell Orihime to run for it as he takes on Mayuri. Not about to loose a test subject Mayuri extends his arm to catch Orihime but it is shot off by one of Ishida's spiritual arrows.

Mayuri is disappointed at the state of his extension arm and detaches it from his body much to Ishida's surprise. He then takes out and uses his Hojiku-Zai which instantly regenerates his arm further surprising Ishida. He then goes on to say that it really doesn't matter if Orihime got away he can always track her down and the sooner he does the sooner he can begin testing. Ishida fires his spiritual arrows at him though Mayuri dodges the first couple of shots and then uses Shunpo to maneuver to a nearby roof. Mayuri makes note that Ishida has been using Hirenkyaku a advanced Quincy technique. Mayuri states that though he can use Shunpo to counter the technique it is tiresome to use and he can't have Ishida moving all over the place thus he resolves to kill him. Mayuri then releases his Shikai and before Ishida can counter with a spirit arrow he is stopped by Mayuri's lieutenant Nemu who blocks him causing them both to be injured by Mayuri's attack. Mayrui is livid that Nemu had let go of Ishida after the attack in his way and hits her as she begs for forgiveness. Mayuri then turns his attention back to Ishida so that he can finish him off.

When Nemu begins to beg for medical help from Mayuri he becomes enraged and goes over to her and begins to stomp on her for her insolence. When Ishida protests at Mayuri's treatment of his own subordinate, though Mayuri claims she wont die from her injuries as he created her body himself and tells Ishida that she is a construct entirely of his making and therefore his "daughter". He then tells Ishida to not dare try to tell him how to treat her, but Ishida still screams out in protest only to realize that his arm is paralyzed. When Mayuri tells him what the special ability of his Zanpakutō is, before he stabs Ishida in his arm cause him to scream out in pain. Mayuri then tells Nemu to kill him but then realizes that she is paralyzed because of the attack as well and stomps on her again. Ishida screams that he should stop prompting Mayuri to question whether his philosophy has to do with the Quincy pride that his people where always talking about before they died. Ishida questions him on what he is talking about and Mayuri details how once he studied the Quincy (though his studies seemingly only included every horrible and cruel way possible, more akin to torture) and had ended his study years ago, he detailed that before dying they would always swear on the pride of the Quincy. Ishida listens on in absolute shock as he hears of the butchering of his people. Mayuri then offhandedly reveals that he was the one who orchestrated the death of Uryū's grandfather, Sōken Ishida and even shows him a image of his grandfather.

Ishida is enraged by the truth of his grandfather's death and swears to kill Mayuri on the pride of the Quincy. He then uses an advanced and rare Quincy technique called Ransōtengai, to control his paralyzed body like a puppet. Mayuri notes that he had never actually seen the technique in any of the 2661 Quincy he studied and is surprised that someone so young can use it. Mayuri then takes out his hidden Kusarigama and resolves that since he is starting to find Ishida interesting, he will keep him alive to study as well. But much to Mayuri's surprise, Ishida removes his Sanrei Glove to gain the power to defeat Mayuri.

Mayuri is utterly surprised as he has never seen this technique before and is unsure of what even happened. He then notices that Ishida is absorbing the surrounding structures, then deduces that since everything in Soul Society is made of Spiritons that he is absorbing them and turning them into strength. Mayrui then tells Ishida that he has gone far beyond the limits of humans, but Ishida's only response is the creation of a complex bow construct with which he fires a spiritual arrow, which Mayuri dodges. To his surprise, Ishida appears from above and shoots him, causing a large explosion. Ishida offers to spare Mayuri if he apologizes to everyone and never appears in front of him again. He threatens to shoot him with a spiritual arrow three times stronger than the last shot if he does not. The previous arrow grievously injured Mayuri, having destroyed his left arm. Now enraged, he chastises Ishida for his cockiness and declares that he could match his power, and releases his Bankai. Mayuri explains that the poison his Bankai releases would surely kill him, though Ishida states that his arrow will reach Mayuri long before his Bankai's fatal poison can be released. Mayuri sends his creature charging at Ishida, who fires his arrow, splitting it in half and shooting a hole through Mayuri's abdomen. Despite the fatal injuries, Mayuri still lives and much to Ishida's surprise, stabs himself in the throat with his Zanpakutō, allowing him to use its ability to turn himself into liquid so that he could escape, seeping into the cracks of the area.

Later, he hears of Isane Kotetsu's announcement of Aizen's treachery after reforming, but upon being asked by Nemu he refuses to get involved, saying that he is not interested.

Bount arc (anime only)
Note: Events occurring in this arc are only in the anime and do not constitute canon material.

Mayuri appears again during the Bount invasion of Karakura Town, in his office when he is approached by 8th Division Captain Kyōraku in reference to having any information on the Bounts. Mayuri flat out refuses to share any information with the inquisitive captain. Not long after Kyoraku leaves Mayuri finds that all his files on the subject have been erased. Mayuri later calls a meeting of the Captains and informs them that there is a traitor amongst them who has erased information from his database, not realizing it was former 11th Division member Maki Ichinose. Mayuri explains to the captains the history of the Bounts. Telling a story about a war between the Quincy and the Bounts, which ended in a Bount defeat. The biggest incident to come out of this defeat is the Bounts consuming living souls to increase their power. Mayuri then deduces that the number of people will increase as the Bounts become more active.

Mayuri finds the information on the Bounts and wanting a Bount test subject, he sends Nemu to give Uryū an artifact that will temporarily restore his Quincy powers in exchange for helping the Bount to reach Soul Society (which he assumes will occur). Meanwhile General Yamamoto begins suspect Mayuri of treason and send Byakuya to search in his families archives for information on the Bounts.

When the Bounts attack Soul Society, Mayuri decides to prove his loyalty by defeating one of the Bount, Sawatari. Sawatari attacks Mayuri with his doll, Baura, and manages to rip Mayuri's left arm off. Mayuri regenerates his arm with his medicine, and uses his Zanpakutō to paralyze Sawatari's doll, Baura. Mayuri then stabs Sawatari in the right arm, and Baura manages to overcome the paralysis to retreat with Sawatari into another dimension. Sawatari surfaces in another location in Seireitei, and Mayuri appears, revealing that he made a scanner to track the Bount. Sawatari attacks Mayuri with the power of other Shinigami that Baura absorbed in previous battles. Mayuri is forced to use his Bankai, and kills Sawatari. The confrontation leaves him severely injured afterwards, largely due to his persistence in trying to capture the Bount alive at first.

Hueco Mundo arc
Mayuri later appears in Hueco Mundo to assist Renji Abarai and Uryū Ishida in dealing with Szayel Aporro Granz alongside his lieutenant Nemu.

Szayel attempts to use his Resurrección's voodoo ability & at first seemed to have easily beaten Mayuri. Suddenly Mayuri stands up & taunts Szayel, so he continues to destroy organs, but this time it had no effect. As it turns out, Mayuri had taken precautions against this ability by implanting himself with fake organs, having studied the technique beforehand using data from bacteria he implanted within Uryū during their last battle (much to Uryū's annoyance). Szayel takes Nemu captive, but Mayuri releases his Bankai and devours Szayel with it. Szayel uses the rebirth power of his Resurrección to recreate himself inside Nemu, but in doing so is affected by chemicals contained in Nemu's body. Mayuri is highly intrigued by this new power, but wonders if there is more than that. To give him what he asked for, Szayel uses his possession ability to control Mayuri's Bankai, but Mayuri already had countermeasures set in place for just that possibility; his Bankai self destructs, reverting back to its sealed state.

Mayuri, disappointed at Szayel's lack of any further abilities, explains that by recreating himself inside Nemu, Szayel is now dosed with a sense-enhancing chemical that he instantly names a 'superhuman drug', as it were. The drug increases Szayel's senses to the point that his body falls grossly behind and cannot move, paralyzing him as minutes become centuries. Mayuri then berates Szayel for his statement as a scientist that he was the perfect being. He then proceeds to pierce Szayel hand and stabs Szayel's heart with his Zanpakutō, wishing him a pleasant eternity, before breaking off the blade as the ultimate torture for Szayel and also as punishment for his Zanpakutō striking at its master.

After searching for Szayel's laboratory throughout the rubble, he realizes that he cannot ask Nemu for help. Musing that she is such a "pain in the ass", he revives Nemu with rather odd and possibly very explicit means and has her dig out Szayel's laboratory, within which are a pair of bodies suspended from the ceiling. After this he continues to to heal Uryū and Renji, the latter being healed first so he could go and help the fight. After he is finished healing Uryu he gives him an anti-Arrancar mine that he invented.

Fake Karakura Town arc
When Byakuya Kuchiki tells Ichigo Kurosaki to go back to Karakura Town, Ichigo complains that he could not get back that easily on his own and that Kisuke Urahara was not there to open the Garganta. Mayuri then suddenly appears behind the group with Nemu pushing a loaded wagon behind him and complains about the fact that Ichigo is constantly fixated on Urahara. He then notes how Ichigo used no honorifics to address him, but muses about the fact that he was better than Byakuya and Kenpachi, who would address him using only his given name.

Byakuya takes notice of his unusually lenient mood and asks if it has something to do with the wagon behind him. Mayuri confirms this and tells that he is in a good mood because not only has he found some "spoils of war" but at the same place he was also able to analyze the structure of the Garganta. When Ichigo questions his statement, Mayuri begins to rant about what he had learned and orders Nemu to make preparations to send the substitute Shinigami to the Human world. When Ichigo further complains, Mayuri explains to Ichigo that this process was an experiment, that Ichigo is "Test Subject Number 1" and therefore, he has no right to refuse or to accept.

Retsu Unohana then arrives and says she'll accompany Ichigo back. Mayuri is surprised that she'd offer to be a test subject too, but she smiles and says that she has faith in him and that she believes the experiment will be a success. Besides that, if Mayuri failed to make a Garganta, even after analyzing information found in Hueco Mundo, then Urahara would laugh at him. Mayuri reminds her that he could close the Garganta during the transfer, which she merely acknowledges as being true. Unohana only says that she expect no less. He then opens the Garganta to let Ichigo and Unohana through.

Before Ichigo leaves with Unohana, Ichigo tells Mayuri how he is similar to Kisuke, which infuriates him. After Ichigo leaves, Mayuri comments to himself how fascinating Ichigo is and how he will formulate a plan to torment Ichigo. Byakuya then asks Mayuri why he didn't go to the Human World as well. Mayuri merely replies that there are multiple more interesting specimens in Hueco Mundo and will simply use the Garganta after the war to study the living world more. Byakuya then suggests that Mayuri has faith in Ichigo's abilities to end the war.

Zanpakutō Unknown Tales arc (anime only)
Note: Events occurring in this arc are only in the anime and do not constitute canon material.

Captain Kurotsuchi was in attendance on Sōkyoku Hill when an emergency meeting of many ranking Shinigami was called. However, he openly complained about the Captain-Commander ordering the meeting at such a late hour. When Muramasa finally made himself known to the Shinigami, he announced that Captain Yamamoto was no longer there. Captain Komamura was disturbed by this news and attacked Muramasa, only to see his own Bankai go rogue and attack him instead. Witnessing this disturbing turn of events, many captains and lieutenants attempted to release their own Zanpakutō, but failed. Upon inspecting his own katana, Kurotsuchi noted that he could no longer feel its reiatsu. As President of the Shinigami Research and Development Institute, he was joyfully intrigued by the arch-villain's powers and eagerly asked what he had done to accomplish such a feat. Muramasa flatly explained that he had cast a spell which "freed" the Zanpakutō spirits from their "prisons." Shortly thereafter, Ashisogi Jizō seemingly materialized out of thin air in front of a dumbfounded Mayuri. But after a brief inspection of the Bankai-like critter, the captain apparently relaxed, wearing a contented smile, a feeling not shared by any of the others present.

Later, he is seen experimenting on himself, discovering that the Zanpakutō have become completely different entities from the Shinigami. After experimenting on the captured Zanpakutō spirit, Gegetsuburi, he discovers that if a Shinigami defeats/kills their respective Zanpakutō, the Zanpakutō will return to them, but if it is defeated by somebody else, it will not. If it's killed by someone else, it will revert to Shikai form, break in half, and be gone forever.

Later after the Zanpakutō spirits and Byakuya attack the Sixth Division's headquarters, Kurotsuchi arrives and detonates Ashisogi Jizō as it is restrained by Kenpachi, effectively subduing his Zanpakutō. As Kurotsuchi attempts to "treat" Ichigo of Ashisogi Jizō's poison, Unohana appears to take over for the fellow captain. He explains that he will use the broken Zanpakutō to learn about how Muramasa's brain-washing technique works.

Research and Inventions
Unlike the inventions of Kisuke, those of Mayuri are not as well known yet.

Gigai Specialization: However, one major invention is present, which is Mayuri's lieutenant and so-called "daughter," Nemu Kurotsuchi, who is the ultimate result of his Gigai and Modified Soul research. The fact that Nemu can survive toxic poisons, a pierced lung, and having all of her nutrients robbed from her, is a testament to Mayuri's own skill in Gigai creation and modification.

Bount Sensor: He also creates a simple Bount sensor in the Bount arc of the anime. Though not as powerful as Kisuke's equivalent mod soul versions, it is far more effective once properly calibrated.

Zanpakutō Reassignment: In an Arrancar arc Shinigami Cup Golden, Kurotsuchi is shown as having the ability to change a Zanpakutō's race and gender, and presents a catalogue to Hisagi and Renji, resulting in Renji's immediate desire to have Zabimaru's form altered to that of a busty red-haired woman.

Data Gatherer: He also implants opponents that escape from battle with data-gathering bacteria so as to monitor them afterwards, as was the case with Uryū during their fight. This was how he was able to counter Szayel's Voodoo Doll technique -- Using the information gleaned from the bacteria he had implanted within Uryū, Mayuri was able to quickly conceive and carry out an operation to safeguard himself and his Lieutenant beforehand.

Fake Karakura Town: One of his greatest achievements is the creation of an exact replica of Karakura town, as he and his division are the ones responsible for its creation.

Anti-Arrancar Mine: After rescuing Uryū from Szayel, he gives Uryū a landmine he designed which is meant to be effective against Arrancar. Once its sensors pick up an Arrancar's reiatsu, it detonates violently. Uryū had recently used it on the Espada Yammy Riyalgo, with the effect of critically injuring the Arrancar in his sealed state; the explosion was very powerful.

Garganta: The technique used by Hollows to move to and from Hueco Mundo. It literally tears open the dimensional fabric separating the worlds, revealing a tunnel of whirling, torrential energy that must be focused and solidified to create a discernible pathway. Mayuri recently learned how to use this ability after researching within Las Noches.

Powers & Abilities
Master Scientist/Inventor: As the head of the Shinigami Research Institute, Mayuri is a talented inventor and scientist, having created a number of devices or techniques to aid him in battle or otherwise. As Mayuri is the mad scientist archetype embodied, he has no morals or empathy in everyday life and apparently his work is devoid of it as well. He is willing to go to any lengths he feels are necessary to achieve his goals, and apparently cares very little for morals or the value of human life. He often takes no interest in the issues of Soul Society and prefers to engage in his research when such issues arise, unless personally ordered to do otherwise by General Yamamoto.

Master Strategist: Mayuri has a talent for being well prepared. He takes various precautions before engaging in personal combat with an adversary, usually studying them through his various methods in order to gain a clear advantage. He seems to always have a contingency plan if something doesn't work out the way he expects.

Body Modification Expert: It is implied that Mayuri has done extensive research on modifying bodies, and he has upgraded a variety of his own body parts to function as weapons or otherwise provide him with useful abilities.


 * Extension Arm: His left arm can extend out like a grappling hook. When the arm is attacked it explodes on impact, but with his regenerative serum, this is not a problem (though it does cause him serious pain.)


 * Hidden Kusarigama: He is able to pull part of his ear out to form a scythe attached to a rope-like ligament for use as a kusarigama. It is easily as sharp as a standard Zanpakutō, and he is quite skilled in its use.


 * Environment Melding Technique: Another one of Mayuri's abilities likely achieved scientifically is his ability to meld with the color and texture of the environment. It was shown when he was attempting to track the Ryoka in Soul Society. When he reveals himself, the topical camouflage flakes away.


 * Organ Replacement Surgery: Most impressively, he has demonstrated the ability to replace functional internal organs with false ones, a feat he performs on himself and his lieutenant to safeguard them from injury. This particular operation is conceived of and carried out in the span of less than an hour.

Master Chemist: Being the current head of the Research an Development Institute, Mayuri has otherwise been shown to be an adept chemist; the results of which are listed here:


 * Superhuman Drug: Mayuri has manufactured a "superhuman drug" that can slow down a person's perception of time. The drug is kept in a bottle by him, but also inside Nemu's body, which is blue in appearance. It is able to make one second seem like 100 years for the unfortunate victim to whom it is administered. An undiluted dose of the drug causes the senses to speed up trillions of times while the relatively "slow" body fails to keep up, resulting in paralysis; on the other hand, it is implied that a diluted dose of the drug can greatly enhance the user's reaction speed. He even stated that a single droplet would have to be diluted 250,000 times to be suitable for use.
 * Hojiku-Zai (Regenerative Serum): Mayuri has also developed a "regenerative serum," which can regrow limbs upon injection, and looks like some sort of green chemical. Of course, it can be used to restore less major injuries as well, as seen with Uryū and Renji.


 * Tracking Expert: He expresses the fact that he merely needs a strand of a person's hair to find them. By using a simple chemical process he can discern the location of the person in question using their DNA is a reference.

Expert Swordsmanship Specialist: While not masterful in swordsmanship as some other Captains, Mayuri is skilled enough to hold his own in a fight. His expertise with his Zanpakutō lies in his effective use of its abilities while its in either its Shikai or Bankai release states, rather than his swordsmanship skill. As he relies on those abilities or his pre-planned strategies rather than actually engaging in melee combat with his opponent. Mayuri seems to be ambidextrous, as he wields his Zanpakutō in his right hand and his scythe-ear in his left (often simultaneously). In the anime-exclusive Bount arc, he briefly wields his Zanpakutō left-handed as well.

Kidō Master: As the Captain of the Twelfth Division, Mayuri is known for his mastery of Kidō. During the Bount arc, Shunsui commented that Mayuri was the most proficient Kidō user in the Soul Society.

Flash Steps Expert: Mayuri was shown easily outrunning Uryū's Flying Screen Step technique after the latter stated it to be faster than flash steps. He could not, however, keep up with the Quincy when he entered the Final Form, making him at least an expert in the technique.

Great Spiritual Power: As the Captain of the 12th Division, Mayuri boasts a great amount of spiritual energy. He is noted to having amazing spiritual pressure that comes in waves.

Enhanced Durability: Mayuri has shown himself to have a high tolerance to pain as shown when battling Uryū Ishida, having almost half of his body blown off but continued fighting.

Zanpakutō
Ashisogi Jizō redirects here. For the manifested spirit that appears in the Zanpakutō Unknown Tales arc see Ashisogi Jizō (spirit).


 * Ksitigarbha is a bodhisattva that watches over children and the underworld. In Japan, where he is known as Jizō, he looks rather like a baby dressed as a Buddhist monk. Mayuri's Zanpakutō's guard is wrapped in a cloth, and has several spiky protrusions sticking out right below the blade, which appear to resemble leaves. The hilt is pink. Unlike most Shinigami, his Zanpakutō's sheath hangs directly in front of him, instead of to his side as they are commonly worn, through a visibly modified hook on the end of the hilt of Ashisogi Jizō.


 * Liquid Form: When Mayuri's stabs himself with his Zanpakutō while in its sealed state, it has the ability to transform Mayuri into a liquid form. Doing so doesn't kill him, as it is a last resort technique, but instead simply leaves him unable to attack or be attacked, making it an effective escape tool. He commonly can move around in this form and speak as well. He reforms after a few days but without any of his previous body modifications. It's uncertain whether this ability is entirely the product of Ashisogi Jizō, since he specifically relates the ability to himself, not opponents. His various physical modifications may have something to do with the effect or it could be an effect of Zanpakutō modification.


 * Shikai: Ashisogi Jizō's Shikai command is . Ashisogi Jizō's blade glows and transforms into a deformed trident with curved, serpentine blades, the middle blade is straighter and longer then the side blades and appear to ascend from the guard which is shaped like a baby's head with hands clasped in prayer (as Ksitigarbha is depicted), all mounted on his sword's normal hilt which has more ornate spiky protrusions on either side, which resemble golden leaves right below the guard. The baby's mouth secretes a poisonous vapor in this form at various intervals.


 * Shikai Special Ability: The weapon works like the venom of a spider bite; when an opponent is stabbed by Ashisogi Jizō, it severs the brain signals controlling the neural impulses for movement in the limb's of the victim, regardless of where they were struck. But unlike regular paralysis, the pain receptors and nerve endings are unaffected by the weapon, so the victim can still feel pain, even in a paralyzed limb. During the Bount arc, it is shown that healing the stab wound does not immediately remove the inflicted paralysis.


 * Bankai: : The Baby's head on the guard opens its mouth as it produces a giant creature with the body of a caterpillar in a red cape with a grotesque golden baby's head and arms with a silver halo hovering around its head. It emits its own individual, red reiatsu upon release. When in this form his Zanpakutō returns to its sealed state. In this state the creature seems to follows Mayuri's verbal commands.


 * Bankai Special Ability: The creature breathes a poisonous derivative of Mayuri's blood which is lethal to anyone who breathes it, aside from Mayuri and Nemu. The poison spreads through such a wide area, and it is almost impossible to avoid it. Konjiki Ashisogi Jizō's poison is very potent, as Szayel Aporro's body started to break down immediately after it was introduced. The poison has an antidote, which Nemu keeps behind her lieutenant's badge, and which Mayuri keeps on his person. Mayuri can change the composition of the poison as well, ensuring that no foolproof antidote can ever be manufactured to cure it, and no immunity is developed against it.


 * Retractable Blades: Konjiki Ashisogi Jizō can produce numerous blades which can also extend from its chest, allowing it to run through and skewer opponents. This, used simultaneously with its poison makes Konjiki Ashisogi Jizō particularly lethal to anyone that cannot keep a safe distance, which is also difficult due to its immense size. Instead of the blades, it can also apparently devour an opponent after it charges into them, killing them.


 * Self-Destruct Protocol: Mayuri has also physically modified Konjiki Ashisogi Jizō itself so that it will self-destruct and return to its sealed state if it were to attack him, implying that it is sentient as well as organic, reminiscent of Captain Retsu Unohana's Minazuki.

Nemu Kurotsuchi
Mayuri's "daughter" that he made himself from combing Gigai and Gikon technology. Since she is his daughter, they hold many similarities. He often abuses and mistreats her in many ways, such as using her as a human shield. Despite all this, Nemu seems to be very loyal to her father and has displayed this when she injured herself in order to give him an advantage in battle. In contrast to Mayuri's persona, Nemu is more kind and caring, shown when she thanked Uryū for not killing her father.

Retsu Unohana
He seems to have a rivalry with Unohana, regarding biomedical care as their divisions sometimes coincide. Though there is no true animosity or hostility, Kurotsuchi has been known to make threats or challenges towards Captain Unohana, who would wave it off with a pleasant comment.

Appearance in other media
Mayuri appears in most bleach games, such newer games like Bleach: Versus Crusade and Bleach: Heat the Soul 6 have him playable in his Hueco Mundo appearance. Some games also have him with Nemu as an assist character.

He is seen in Bleach: The Diamond Dust Rebellion and Bleach: Fade to Black, experimenting as usual. He also has a Bleach Beat Collection, "Not Perfect is Good".

Trivia

 * Kurotsuchi's last name is one of the few Shinigami names in Bleach which uses kanji based on the meaning of the name and not the sound. "Kurotsuchi" means "black soil" (kuro - black; tsuchi - soil), as does the kanji (涅). However, the kanji's reading (pronunciation) is "ne" or "so".


 * Interestingly enough, Mayuri's Zanpakutō refers to Jizō (being his Japanese name), in contradiction to Mayuri's behavior and Zanpakutō abilities, especially that Jizō, in the Japanese culture, watches over the children and those who suffered in the underworld.


 * Tite Kubo has stated in an interview that Mayuri is his favorite character to draw.

Quotes

 * (To Uryū Ishida) "It's unfortunate that I can't do research on an excellent specimen like you."


 * "I swear. Everyone here gets so worked up over the most minute details."


 * "Arrancar, Arrancar, Arrancar, Espada? How intriguing. Hueco Mundo is a treasure trove."


 * (To Szayel Aporro Granz) "Acquaintance? I don't know anybody from that primitive species. Despite the fact Quincy are an endangered species, I don't have the slightest interest in them."


 * (To Szayel Aporro Granz) "There is no such thing as perfect in this world. That may sound cliché, but it's the truth. The average person admires perfection and seeks to obtain it. But what's the point of achieving perfection? There is none. Nothing. Not a single thing. I loathe perfection! If something is perfect, then there is nothing left. There is no room for imagination. No place left for that person to gain additional knowledge or abilities. Do you know what that means? For scientists such as us, perfection only brings despair. It is our job to create things more wonderful than anything before them, but never to obtain perfection. A scientist must be a person who finds ecstasy while suffering from that antinomy. In short, the moment that foolishness left your mouth and reached my ears, you had already lost. Of course, that's assuming you are a scientist."


 * (To Byakuya Kuchiki and Kenpachi Zaraki) "If I may make a request it is of the utmost importance that the both of you dispose of him in a timely manner. If he grows any larger it will make the autopsy exponentially more difficult"

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