Akaza x koyuki

muzan: demon king, kokushibo: upper-rank 1, douma: upper-rank 2, hantengu, sekido, karaku, aizetsu, urogi and zohakuten: upper-rank 4, gyokko: upper-rank 5, gyutaro and daki: upper-rank 6, rui: lower rank 5

The Infinity Castle is a pocket dimension consisting of lamplit wooden rooms, long halls, and moving corridors. It possesses a warped direction of gravity, allowing demons to stand upright, upside down, or perpendicularly on the walls, or move in physically impossible directions. Its unusual structure and layout as Nakime's Blood Demon Art allows any structure within to shift at her will, though the castle additionally also seems to move on its own. Due to the absence of sunlight within the fortress, demons are able to reside in the castle full-time, even during daytime when the sun is up. The walls of the fortress prevent any penetration of light and ensures that there is no risk of demon inhabitants being burned by sunlight, providing them with a secure haven, it's also where meetings are held

Rui was a boy of short stature and small physical build. His skin was solid white, with red dots appearing at several spots on his face, located above his eyes where his eyebrows are supposed to be, below his left eyelid, ending above his nose, and finally a vertical one running the length of his right cheek. His hair was white and bore resemblance to spider legs. The sclera of his eyes was dark red, while his irises were white, having teal colored eyelashes. Due to holding the position of Lower Rank Five, Rui had the kanji of Lower (下か, Ka?) and daiji for Five (伍ご, Go?) engraved into his left eye, signifying his ranking. His right eye on the other hand had three pupils, with one large one in the center, and two smaller ones to the right and left of the center pupil.

He wore a white, oversized kimono that had spider webs etched on the sleeves and the expanse of the hem, which also possessed a loose collar, decorated with the same dot-like markings as his face, and a dark red obi belt around his waist. He also wore a plain, white juban underneath, and was barefoot. His nails bore the same color of his eyelashes. Rui was a quasi-calm, aloof, and somewhat polite individual, rarely raising his voice, and talking to anyone, demon or Demon Slayer, with a reasonable tone and vocabulary, though his low and guttural way of speaking seems to imply repressed anger and annoyance. Every time he spoke with Tanjiro Kamado during their initial duel, he remained somewhat civil in speech.

Despite this stark difference in demeanor when compared to most demons, Rui still had the cruelty that most demons possessed, and was actually a disturbed individual who desired the close bonds that a family had and expected family members to perform their own roles. In spite of his yearn to experience this bond, his vision of attaining one was incredibly twisted and founded on nothing but fear of him, instilled through repeated abuse on his fellow kin, which he did with unrepentant sadism

Gyutaro was cruel, ruthless, petty, and envious of anyone blessed with a better life than him, owing to a life of near-constant poverty and the harsh tragedies he experienced whilst human. He developed a habit of sarcastically complimenting a person's best traits before vindictively killing them afterwards. Despite his negative traits, Gyutaro possessed a genuine, strong love for his younger sister, Ume. Having raised her himself due to his mother's mental instability and later death, this familial love was so strong that, even after becoming a demon and nearly forgetting his life as a human, he still retained a considerable attachment to her. Due to this, he occasionally spoilt and allowed her to do whatever she pleases, even if her actions went against his best interests.

Gyutaro was a tall man of fairly muscular build, with a pale gray complexion speckled with black blotches. His anatomy was quite strange in that his upper torso, arms, and legs were all defined with musculature, whereas his waist was incredibly skinny to the point of looking skeletal, with his pelvis jutting out at an unnatural angle. His spine was prominently visible through his back, and he was usually shown being hunched over. Gyutaro possessed thin eyes that were slanted drastically downwards at the sides, giving him a permanently haggard gaze. His miotic irises were green with a dark orange center, and his sclera was a bright yellow-orange with visible veins. The kanji for "Upper Rank" (上じょう弦げん, Jogen?) is carved across his right eye, and the daiji for "Six" (陸ろく, Roku?) carved on his left. During his fight with the Demon Slayers, he lends his left eye to Daki and spends the rest of his battle with said eye shut, giving him a permanent wink. He had unruly black hair that transitioned to a brighter lime green around the crown of his head, worn messily in uneven bangs and several locks. His body and limbs had noticeable ink-like markings in the form of black spots on his body and a flowing water-like pattern on his face. His fingernails and toenails were black. He also had a full set of sharp, interlocking teeth. Gyutaro was described to look very ugly. Gyutaro wore little, only sporting a pair of baggy blue pants and seven pieces of pattern red cloth to decorate his body, one large one around his neck and three smaller ones around each arm. After Tengen's failed attempt to decapitate Gyutaro by holding on to the tip of his dual Nichirin cleavers, the cloth around his neck was cut and he spent the remainder of his fight bare-necked, implying that Gyutaro was one of the few demons who wore clothing not made from their flesh.

Porcelain Vase Spells: Gyokko's Blood Demon Art revolved around his porcelain vases. He was able to spawn them anywhere within his vicinity and create multiple pots of varying sizes at once. Gyokko first displayed the ability to freely teleport from one pot to another instantaneously, offsetting his lack of legs and allowing him to travel far distances with minimal effort as well as to evade attacks easily. Gyokko could also trap objects (such as people) inside his pots. If the object he wishes to seal is too big, the pots can simply compress them to fit inside. The pots also seem to give Gyokko liberty of whatever was inside, which he uses to merge the swordsmiths together in impossible ways and allows him to create whatever he pleases inside them.

Gyokko had a very bizarre and grotesque physiology, taking on the form of a pale white, abstracted, grotesque humanoid figure with a muscular upper torso that has no arms and resembles that of an armless statue growing from a porcelain vase, similar to a djinn. His midsection is a red-violet color while his lower-half, or his tail is black. He had multiple underdeveloped and infant-like hands with red fingernails; four on his head that replaced his ears and were always present, and several lining up his body and tail which he can retract at will. He also possessed thin fins on the top and back of his head that were akin to hair, which were of a blended hue of purple and a blue-violet color and shaped in the style of cornrows and a ponytail.

Gyokko's face was even more distorted, with large green-lipped mouths located where one would expect his eyes sockets to be located, which always displayed his hyperrealistic teeth and sometimes had one of or both of his tongues sticking out. His actual eyes were located vertically from one another on his face; one eye, with honey brown irises and bloodshot, appeared in the constantly open bottom mouth and the other, similarly honey brown with bloodshot, was seated at the center of his forehead. Three dots were on top of the latter eye. The kanji for Upper Rank (上じょう弦げん, Jōgen?) was engraved on his forehead's eye and the daiji for Five (伍ご, Go?) was engraved on his mouth's eye. In addition, his twin green mouths are generally expressionless and only move when speaking or eating, while the mouth that displays his lower eye is the one that contorts to display Gyokko's emotions. personality: Gyokko was shown to be an easily excitable demon, constantly fawning over new inspirations for what he deems his "art". Gyokko was also short-tempered, shallow, and arrogant, especially when it comes to things regarding his "art", as seen when he was easily enraged by Muichiro when the latter began to insult and make fun of the quality

As a holder of the fourth highest title in the Twelve Kizuki, Urogi was an extremely powerful demon. Through his Blood Demon Art, he was able to create extremely powerful sound waves from his mouth, enough to cause tinnitus and even temporary deafness. He had one of the most impressive physical abilities of Hantengu’s primal emotions, as his avian biology gives him the ability to fly, making combat with a sword against him extremely difficult, as Urogi could easily dodge any attacks while using his flight and speed to sink his talons into his opponents. In addition, as one of Hantengu's many emotional manifestations, Urogi was effectively immune to decapitation from a Nichirin Sword, meaning his only weaknesses were sunlight and the possibility that Hantengu's main body should die, and the demon took extreme measures to make sure the latter did not happen

species: demon rank: upper-rank four clone: the joy clone looks: Urogi (空うろ喜ぎ, Urogi?) was a tall young man with a lean muscular build, dark long spiky hair that goes past his shoulders with a yellowish tinge, and narrow gold eyes with the kanji of Upper Rank (上じょう弦げん, Jōgen?) engraved on his left eye, and the daiji for Four (肆し, Shi?) engraved on his right. He had brown skin, two prominent curved horns on his noticeably shrivelled and discolored reddish-purple forehead and cracked markings under his eyes. Urogi also had the kanji for "joy" (喜, Ki?), etched into his tongue. Urogi had pointed ears and sharp nails on each finger. He was usually seen wearing an sadistically overjoyed expression on his face, similar to Karaku. Unlike the rest of Hantengu's humanoid manifestations, Urogi possesses an avian physiology, possessing two large wings on his back and raptor-like feet armed with sharp talons that take the place of his hands and legs; additionally, Urogi had a thick coat of brown feathers around his legs, reaching down to his knees, and he only wore a chain of gold colored pearls around his waist along with purple tassel ornaments hanging from four pearls. personality: As the manifestation of Hantengu's joy, Urogi was the most jovial and giddy of Hantengu's clones. Similar to Karaku, he seemed to view the entire battle against the Demon Slayers as nothing more than a game or as a source of entertainment, as seen when he happily complimented Tanjiro on his intelligence for correctly guessing that neither one of the four clones was the "real" body and constantly exclaimed that the entire fight against Tanjiro was delightful. He was also shown to very boastful of his avian abilties, as he brags to Tanjiro about the speed and strength of his talons. Despite this, he could lose his patience should his opponent prove too challenging to finish off, shown when he was angered when Tanjiro sliced off the top part of his head.

Aizetsu, alongside the other primal emotion clones, were able to hold off and overwhelm the combined efforts of Tanjiro, Nezuko and Genya, all of whom were powerful and seasoned Demon Slayers. He notably was able to impale Genya through the abdomen almost immediately after being split off, and later left several puncture holes in him using his Blood Demon Art after he stepped in front of Tanjiro to protect him. If it hadn't been for Genya's regenerative capabilities from eating demons, the young Demon Slayer would've certaintly been killed. However, like almost all of Hantengu's manifestations, Aizetsu was outclassed by Zohakuten.

looks: Aizetsu (哀あい絶ぜつ, Aizetsu?) was a tall young man with a lean muscular build, dark long spiky hair that goes past his shoulders with a blueish tinge, and narrow, deep blue eyes with the kanji of Upper Rank (上じょう弦げん, Jōgen?) engraved on his right eye, and the daiji for Four (肆し, Shi?) engraved on his left. He had brown skin, two prominent curved horns on his noticeably shrivelled and discolored reddish-purple forehead and cracked markings under his eyes. Aizetsu also had the kanji for "sorrow" (哀, Ai?) etched into his tongue. As a demon, Aizetsu had pointed ears and sharp nails on each finger. He was usually seen wearing a dejected expression on his face. Aizetsu wore a navy-blue kimono with periwinkle bows, and long, tracksuit-like white lines running through his thin sleeves. He had matching navy-blue baggy tikka pants with long, tracksuit-like white lines running through his legs, and a nio dasuki (仁王におう襷たすき, nio dasuki?) made of blue Shimenawa (注連縄しめなわ, Shimenawa?) rope tied around his shoulders. Aizetsu wore a pair of black Jika-tabi on his feet. Aizetsu was always seen carrying around a Jūmonji Yari (十じゅう文もん字じ鑓やり, Jūmonji Yari?). personality: As the manifestation of Hantengu's sorrow, Aizetsu was portrayed to be completely dejected, sour, and negative, constantly describing everything as depressing. Out of all the manifestations, Aizetsu was shown to be the calmest and most collected out of all five of them, as seen when instead of frivolously wasting time on entertainment as Urogi and Karaku or immediately getting agitated and enraged by anything like Sekido, Aizetsu was shown to calmly analyze his opponents to think out a strategy and figure out his opponents' abilities and weaknesses before attacking. Unlike the usually vicious and bloodthirsty attitude most demons possess when killing humans, or even compared to the rest of Hantengu's clones, Aizetsu chooses to kill quickly by striking vital areas, and he feels sadness should his opponent fail to die

As a holder of the fourth highest title in the Twelve Kizuki, Sekido was an extremely powerful demon. His Blood Demon Art enables him to create bolts of lightning to incapacitate his opponents, making close combat against him extremely dangerous. In addition, as one of Hantengu's emotional manifestations, Sekido was effectively immune to decapitation from a Nichirin Sword, meaning his only weaknesses were sunlight and the possibility that Hantengu's main body should die, and the demon took extreme measures to make sure the latter did not happen

looks: Sekido (積せき怒ど, Sekido?) was a tall young man with a lean muscular build, dark long spiky hair that goes past his shoulders with a reddish tinge, and narrow, deep red eyes that have the kanji of Upper Rank (上じょう弦げん, Jōgen?) engraved on his right eye, and the daiji for Four (肆し, Shi?) engraved on his left. He had brown skin, two prominent curved horns on his noticeably shrivelled and discolored reddish-purple forehead and markings under his eyes that give his face a cracked appearance. He also had the kanji for "anger" (怒, Ika?) etched into his tongue. As a demon, Sekido had pointed ears and sharp nails on each finger. He was usually seen wearing an irritated or enraged expression on his face. Sekido wore the same asymmetrical kimono as Hantengu, as he was formed from Hantengu's headless body. He also wore a pair of zōri and a violet obi. and was always seen carrying around a Khakkhara (錫しゃく杖じょう, Shakujō?). When he was first formed, Sekido took the appearance of a slightly older man; he had unkempt wavy hair and a sharper nose, similar to Hantengu. It isn't until Aizetsu forms from his severed head that he is rejuvenated. personality: As the manifestation of Hantengu's anger, Sekido was in a constant state of vexation, irritation, and rage, even towards his fellow clones, which could be seen when he easily got angered when they failed to meet his expectations and were subdued by the Demon Slayers. Sekido was also seen to care very little about his brethren

looks: As the manifestation of Hantengu's pleasure, Karaku showcased himself to be the most relaxed and laid-back of Hantengu's clones. The entire time he was battling against Genya, Tanjiro and Nezuko, he was constantly either praising or mocking them, and instead of taking the battle seriously, he saw it as nothing more than a game, seemingly to only take interest in the new experiences he was obtaining in the battle. This was demonstrated during his battle with Nezuko, when, instead of finishing her off immediately, he decided to tease and play with her despite being able to easily overpower her anytime he wanted. Later when Genya shoots off Sekido's hand, Karaku immediately takes an interests and decides to entertain himself by fighting Genya instead. This behavior easily got on the nerves of his fellow clones, such as Sekido, who constantly berated him for not taking on a serious outlook in battle, and Aizetsu, who was confused at why he was taking so long to kill Nezuko. personality: As a holder of the fourth highest title in the Twelve Kizuki, Karaku was an extremely powerful demon. blood demon art: His Blood Demon Art allows him to create powerful gusts of wind, which if blown straight could throw enemies over a large distance, and if blown downward would crush them with immense pressure. In addition, as one of Hantengu's many emotional manifestations, Karaku was effectively immune to decapitation from a Nichirin Sword, meaning his only weaknesses were sunlight and the possibility that Hantengu's main body should die, and the demon took extreme measures to make sure the latter did not happen

As the holder of the fourth highest title in the Twelve Kizuki, Hantengu was an extremely powerful demon. Although he himself was far too nervous and jittery to actually directly fight his opponents, through his Blood Demon Art, he was able to create four clones that were manifestations of his emotions, each of them possessing an Upper Rank demon's level of strength and having their own unique power, allowing him to outnumber and overwhelm the Demon Slayers that tried to slay him and giving him a wide arsenal. Most notoriously about Hantengu's unique power was that he takes advantage of the traditional method of decapitation to kill a demon, as beheading Hantengu's primary form will cause Sekido and Karaku to emerge and engage the threat. Beheading the first two manifestations further will then result in the release of Aizetsu and Urogi, and any subsequent decapitations of the clones will prove futile if Hantengu remains alive, or in Urogi's case, severed body parts can even use his Blood Demon Art to attack an opponent. Flesh Puppet Similar to Enmu, Hantengu seems to have the ability to create a duplicate of himself able to utilize his Blood Demon Art, as shown when he encounters Muichiro and the Kamado siblings and splits into Sekido and Karaku after being beheaded by the former, despite his main body having already shrunken and hidden in a shrub before the showdown.

looks: Hantengu was a short, frail man with a very thin and skeletal body, covered with veins and wrinkles, and is usually seen crouching. His most noticeable feature is a large bump on the top of his head, accompanied by two curved horns and a prominent brow ridge that lacks eyebrows. His face was thin with a sharp chin and he constantly wore an expression of terror and fear with a rictus grimace. He had brown skin and his forehead was also noticeably shrivelled and discolored reddish-purple. His eyes are narrow and often appear to be squinting, obscuring his miotic pupils. He had red eyes with golden irises, with the kanji of Upper Rank (上じょう弦げん, Jōgen?) engraved on his right eye, and the daiji for Four (肆し, Shi?) engraved on his left. Hantengu also had the kanji for "fear" (怯, Obie?) etched into his tongue. He had dark, shoulder-length, disheveled and wavy hair with a low hairline, only growing out from the back of his head and ears, which themselves are sharper and longer than normal humans. His nails were long but not sharp like most other demons and retain their natural unkempt form. Hantengu wore an asymmetrical kimono that was split in the middle, the right half being black and covered in a diamond-like pattern of flowers and lines (simplified to wavy yellow lines in the anime), with the left half being a dark red and lacking any detailed features. He also wore a pair of zōri and a violet obi. personality: Hantengu's primary form has a persona of extreme cowardice and agitation. He was easily frightened by what occurred in his surroundings, showing traits of paranoia, fear, and delusion. He was always shown to cry out in fear at even the most insignificant things, such as the number of years since the last meeting of the Upper Ranks being 113. Moreover, during said meeting, Hantengu spent most of the situation crying out and cowering in fear over everything around him, from Muzan reprimanding them, to the in-fighting between Akaza and Doma.

looks: Nakime is a pale woman with a grayish complexion, who has sharp, blue-stained nails and notably dark pink lips which sharply contrasted the tone of her skin. She has glossy, hip-length hair of a black color, which she wore falling down her back in slight waves that cut off sharply at the ends, with two chin-length strands left to frame her face and long bangs that obscured her large eye set in between them, swept to either side of her nose.

Nakime dons a plain-loose black kimono with a white loose yuban underneath, secured with a striped pale brown-striped obi, white socks and no shoes or clogs. She was always seen holding a four-stringed. personality: Unlike most demons, Nakime was not particularly violent or sadistic, and instead is aloof and taciturn, almost never speaking and displaying little to no emotion or will outside of obeying orders. She was extremely loyal to Muzan, listening and following his every order faultlessly, something he appreciated; in fact, her unwavering loyalty to him marks one of the very few instances Muzan ever complimented an individual, though it seemed more likely that he was satisfied to have a powerful tool to use at his disposal. Despite this outwardly one-sided relationship, Nakime graciously accepted his words and told her master she was honored to be of great use to him.

She showed little interaction with other demons and seems to be mostly disinterested in their presence. During the Lower Ranks Meeting, she calmly sat by and observed with the same stone-faced expression as the demons were all ruthlessly killed, almost paying them no attention and simply waiting for Muzan to give her another order. Similarly, in the Upper Ranks Meeting later on, she only speaks during two instances; answering Akaza's queries and rejecting Doma's invitation to be at his temple.

Obi Sash Manipulation: Daki's Blood Demon Art allowed her to create flower-patterned obi sashes from her flesh, as well as freely manipulating them at will. Daki often created these sashes from her back and retracts them back into her body when not in use. She has also displayed the ability to exert control over her obi from extremely far distances. Her sashes are noted to be soft like silk yet as sharp as a Nichirin Sword. In combat, Daki used her obi sashes as powerful and fast tendril-like whips to unleash long-ranged interweaving attacks while also being able to use it to form a shield around her body if need be, making her Blood Demon Art an extremely effective blend of offense and defense. Her sashes were so powerful that they could repel and block attacks from Tengen's explosives and slice up buildings with ease. Furthermore, they are especially difficult to cut because of their soft properties, and can further loosen the effectiveness of slash attacks by bending and weaving. Her sashes had a unique property that allows her to store objects, usually humans she wanted to eat, inside her sashes. She traps them inside the sashes by transforming the objects she wishes to store into 2 dimensional flat versions of said object. This allowed her to be stealthy with her movements, as any opening or pathway that is wide enough for a sash to fit in is one that she can take. To free someone from being trapped in the sashes, one must cut it apart while avoiding cutting the people trapped inside, immediately freeing anyone and returning them to their original form. Daki mainly used this ability to store humans that she wishes to eat in a space underground and consume them later. Lastly, Daki can transmute her own neck into a sash to prevent herself from being decapitated

Daki was a tall and curvaceous woman with lime green eyes with a dark orange center, long eyelashes, and very pale skin. Her initially black hair was styled in a full, long ponytail with kanzashi hairpins (three on each side) holding up the ponytail. The kanji for "Upper Rank" (上じょう弦げん, Jōgen?) was engraved in Daki's left eye and the daiji for "Six" (陸ろく, Roku?) was engraved on the right. She had a pink obi with black hexagon patterns on all of it, along with light grey blue flower with darker on the center and light orange three length lines on it wrapped around her waist, used as her Blood Demon Art. She sported two pink flower-like demon crests on her face and light purple on the center, one on her cheek and another on her forehead. She wore a two-piece version of her kimono consisting of magenta pink panties tied by long, magenta bows on the sides and with two black pieces of cloth with dark magenta flower patterns on the each sides of the cloths that cover her chest with length part than flow reaching her hips. She had black thigh-high stockings with magenta lines on the center of the stocks with the black-flower patterns around them layered with white stockings with one line on each of them and tall three-legged sanmaiba/koma-geta or mitsu-ashi shoes. After Daki's obi sashes return to her, black cracks appear on various parts of her body and her hair shifts from black to pale white with lime green tips,[9] matching her original hair color when she was human personality: Daki was a very prideful, dismissive, and sadistic person, taking enjoyment in toying with her victims before killing them and not showing the slightest bit of guilt or remorse for taking the lives of her victims. She thought very highly of herself, dismissing all non-Hashira Demon Slayers as not worth her time

Porcelain Vase Spells: Gyokko's Blood Demon Art revolved around his porcelain vases. He was able to spawn them anywhere within his vicinity and create multiple pots of varying sizes at once. Gyokko first displayed the ability to freely teleport from one pot to another instantaneously, offsetting his lack of legs and allowing him to travel far distances with minimal effort as well as to evade attacks easily. Gyokko could also trap objects (such as people) inside his pots. If the object he wishes to seal is too big, the pots can simply compress them to fit inside. The pots also seem to give Gyokko liberty of whatever was inside, which he uses to merge the swordsmiths together in impossible ways and allows him to create whatever he pleases inside them.

Moon Breathing (月つきの呼こ吸きゅう, Tsuki no kokyū?): Kokushibo is the first demon that utilized Breathing Styles. His Breathing Style, in particular, is one of the most dangerous and powerful ones displayed thus far. Enhanced with his Blood Demon Art, he can create many chaotic crescent-moon blades when slashing that vary in length and size in crescent shaped sword attacks. Kokushibo had continued to develop this Breathing Style and had created over a dozen techniques over the centuries he had lived. Crescent Moon Blades: Complementing his Moon Breathing, Kokushibo's Blood Demon Art allows him to create and manipulate dozens of sharp blades shaped like traditional crescent moons from his flesh katana.[61] They are implied to have been created from his blood and can be either a bright yellow or a bright blue in color.[64][65] These crescent moon blades are innately chaotic, constantly changing in size, direction, and speed, making Kokushibo's attacks extremely unpredictable and unreadable as they have no set pattern at all.[66] This Blood Demon Art greatly enhances the power of his techniques, making every single one of his sword swings extremely deadly and dangerous. He also seems to be capable of using his Blood Demon Art as long as his katana is unsheathed, allowing him to create crescent moon blades even without swinging his sword or unleashing a technique. Flesh Katana:[1] As a former Demon Slayer and user of a Breathing Style, Kokushibo wields a warped version of a Nichirin katana.[78] Created from his own flesh and blood, his body's immense durability and hardness allow it to be just as sharp, if not more so, as a normal Nichirin weapon made from Scarlet Crimson Iron Sand (猩しょう猩じょう緋ひ砂さ鐵てつ, Shōjōhi Satetsu?) and Scarlet Ore (猩しょう猩じょう緋ひ鑛こう石せき, Shōjōhi Kōseki?). Its blade is blood-red, with a veiny appearance, and numerous eyes cover the blade and the tsuka.

Kokushibo is a tall man with a muscular build and a pale complexion. He possesses long, spiky black hair with red tips, that he keeps in a ponytail. His most notable feature is the three sets of eyes on his face with yellow irises and red flesh sclera that have black straight lines diverging from each iris. His middle set of eyes has the kanji of "Upper Rank (上じょう弦げん, Jōgen?)" on engraved on his left eye, and daiji for "One (壱いち, Ichi?)" on his right, while his other sets of eyes feature black pupils and a cracked pattern in the irises. His top set of eyes replaced his eyebrows. Kokushibo also has red markings resembling flames on the top left side of his forehead and the bottom right of his chin. Kokushibo wears a purple-and-black hexagonal-patterned nagagi kimono and black umanori-styled hakama pants tied with a white uwa-obi, with pair of zōri with purple straps and white tabi socks. He carries a fleshy katana at his waist that, has eyes in the space between the tsuka ito wrapping of the handle of his sword. The tsuba and blade are shown to have eyes and veins. The scabbard is also fleshy in appearance. personality: Kokushibo is reserved, silent, and aloof, maintaining an aura of unnerving tranquility and mystery that complements his position as Upper Rank One. He rarely speaks; when he does, he talks in a slow and emphatic manner that gives more gravitas and authority to his words. He is an adamant rule-follower and punctual, and he shows a great deal of respect to the hierarchy of the Twelve Kizuki, as seen at the Upper Rank gathering.[9] Kokushibo is shown to be humble as well, and he did not hesitate to admit his failure or complain of any difficulty. He demonstrates unwavering loyalty towards Muzan Kibutsuji as he carries out his actions solely to fulfill Muzan's objectives. Despite his outward display of reservation, dignity, and humility, there exists a cold and unforgiving side to his personality. When reprimanding individuals, his words can be harsh

looks: Muzan is a tall man with a lean muscular build along with an unnaturally pale skin complexion that can be easily confused as being unhealthy and sickly. He has curly black hair and sharp, almond-shaped eyes. His irises are cat-like in appearance and are of a plum red color. He also possesses sharp, blue nails on his hands. Physically, he appears to be in his twenties. In his first appearance, Muzan was shown wearing a white fedora with a red ribbon and a somewhat extravagant outfit, consisting of an embroidered black tuxedo and a white tie over a black dress shirt and white dress pants. He also wore black loafers personality: Muzan is cold-hearted, ruthless, intimidating to other people, exceptionally intelligent

Cryokinesis: Doma's Blood Demon Art grants him extremely powerful cryokinesis. He can generate ice and frost from his flesh and blood and can spawn it anywhere in his vicinity, as well as manipulating it at will, allowing him to unleash incredibly potent ice techniques. Additionally, the ice created from his Blood Demon Art is extremely lethal to those that inhale it, causing the cells of the victim's lungs to die and rendering them unable to breathe very quickly. His ice and frost have also been noted to be extremely cold, as shown when the air around Doma's frost was cold enough to make Shinobu's lungs feel as if they were about to burst and nearly freeze Kanao's body and surroundings just by coming into contact with it.

Doma is outwardly friendly and cheery, possessing an approachable and charismatic air. Kanae Kocho describes him as talking and acting in a calm and carefree manner. However, in truth, he has psychopathic tendencies and adopts sick beliefs and habits, such as devouring his cult's followers with the belief he is saving them from their suffering and pain by letting them live inside his body. Under his carefree and unassuming demeanor that made him appear inane and witless, Doma is a cold and calculating individual with an extremely keen intellect. His high intelligence may be the reason why he looks down on humans, genuinely believing that they are pathetic and pitiful. He even cried out of pity for them. His condescending attitude towards humans was also showcased when he was decapitated by the combined efforts of Shinobu, Inosuke, and Kanao, feeling insulted to be killed by individuals whom he thought lowly of. Doma is clinically apathetic, completely emotionless, and unable to experience proper emotions. Doma himself admitted that the concept of emotion was completely foreign to him, even as a human. Aware that this is abnormal, Doma compensated for his empty heart with his own charisma. He learned to express his carefree demeanor enough to deceive all but the keenest observers. Despite leading a cult, Doma is a nihilistic atheist who staunchly believed that gods, Buddhas, and the afterlife do not exist. He believed that after death there is nothing and that people who "could not accept something so simple" are naïve and dumb.

looks: Doma is a tall young man with a lean, muscular build. He is of extremely pale complexion and possesses long, pointed nails that appeared to be stained with a pale purple. He possesses long platinum blond hair that he wore parted to his right, the shorter parts around his face seeming to flare out to either side around his head, curving backwards with one lock slanting down to the right of his face to fall between his eyes, while the longer parts were left to drape centrally down his back in a thinning spiral. Due to his beauty, he was made a cult leader and seen as a divine being due to such. His eyes have been described to be incredibly rare and beautiful, as, in color, they appeared to be made up of an array of rainbow pastel tones that fade into one another as they circle his irises, this unusual appearance even causing people to believe Doma is a blessed being who could communicate with the gods. The kanji for Upper Rank is etched across his left eye, and the daiji for Two or Six at the time when he first met Gyutaro and Daki. on his right, with thick eyelashes and a set of notably thick black eyebrows acting to frame them above. Doma wore a blood-red turtleneck of a design that made it appear that the section between his neck and upper chest is covered by a black substance that looks like it's dripping slightly down his body, this same design repeated at his wrists and down his hands, as well as on the small, circular "blood stain"[14] he adorned on his head. Below this, he wore a pair of straight, tan-colored hakama pants of a pinstriped design, their cuffs visibly loose, which he secured with a pale green-tinged golden belt (originally colored black, and colored white in the anime), its buckle a bright silver. He also only wears plain black tabi socks on his feet. On occasion, Doma may also have been seen sporting a black cloak, which he drapes around his shoulders, two lengths of purple and black cloth with a rectangular pattern also hanging from it.

Akaza's human name was Hakuji, who lived in poverty with a sick father. He stole medicine for his father, but was caught, branded, and later learned his father committed suicide out of shame. Banished and enraged, he became a skilled fighter and was taken in by a dojo master, where he fell in love with his daughter, Koyuki. After a rival dojo poisoned Koyuki and her father, Hakuji massacred the rival dojo, not knowing koyuki was still alive and was a demon. His gruesome actions caught Muzan's attention, who turned him into the demon Akaza, erasing his memories but preserving his desire to become stronger and his refusal to harm women While Hakuji was away, a rival dojo poisoned the well from which Kaiso and Koyuki drank, leading to their deaths. Overwhelmed by grief and rage, Hakuji sought out the rival dojo and killed all 67 members with his bare hands.

looks: Koyuki was a fair-skinned young lady with large, rounded pink eyes with white pupils shaped as flowers. She was of short stature and possessed a slim frame. She had black hair which was always tied into a large bun fastened with a hairpin and decorated with a Kushi and three snowflake hairpins.

Koyuki primarily wore a circle-patterned, pink kimono that faded into blue with white snowflake and black vine patterns tied with a black obi. She alternatively wore a light-blue kimono with black floral patterns tied with a yellow obi. personality: Koyuki had a kind and gentle personality, showing much gratefulness to Hakuji during his time looking after her. She would get emotional and cry when having normal conversations with him, especially concerning his reassurance of returning to the annual fireworks show, as it reminded her of hope and that there were many opportunities to enjoy the things she never had the chance to enjoy.

Akaza was a headstrong, stubborn, and battle-crazed social Darwinist who enjoyed fighting, especially against strong Demon Slayers. He purposefully drew out fights to savor every moment of it; the Upper Rank tended to become enthralled whenever he was hit by a powerful opponent, not due to masochism but out of a genuine admiration for their skills. Akaza always complimented his opponents when they unleashed powerful techniques or landed blows on him, usually remarking that their techniques and swordsmanship were magnificent and intriguing. Akaza looked down on anybody he deemed weak, so much so that his skin would crawl at the sight of them. He genuinely respected those who were strong in his eyes, demanding to know their names, and would not stop until he found out; he remembered all the names of strong opponents of the past and committed them to memory as a tribute to their strength. Akaza also presented an opportunity for those he recognized the strength of to become demons, believing that preserving their refined techniques and skill was right and feeling pain watching the deterioration of those blessed with extraordinary gifts as they age, and going so far as to kill them to preserve their magnificent skill himself should they decline his offer to become a demon. He also did not discriminate against strong warriors who were weak before, he's kind and loving with koyuki

During his human days as Hakuji, he had the same hair, just colored black rather than pink, and pale blue eyes with unusually-colored light pink eyelashes. He was also very muscular as a human and bore three black criminal tattoos on each forearm. He also wore a dark blue-gray yukata. Akaza was a very muscular young man of average height with skin so fair it appeared bright green-tinged white, decorated by a pattern of thick blue lines, which resembled the criminal tattoos he had as a human. Akaza had short, bright pink hair that fluffed out around his head and inward-tilting yellow eyes with pink eyelashes and blue sclera that somewhat resembled cracked glass. The kanji for Upper Rank was etched into his right iris, and the daiji for Three was etched into his left. The lines on his face curved through each of his eyes from below his ears to over his temples, another blue line running from the center of his hairline to the bridge of his nose, with two more lines running around his neck, three others branching off the lower one to his torso. The middle line ran directly down his chest to halfway down his stomach, and the other two branched off to the sides over each side of his chest to join the two other lines. This same three-line pattern also repeated around his waist. On his arms, lines were running down the front of his shoulders that ran into two more, which went around his biceps before continuing to run down to his wrists, below which each of his fingers was also dark blue with an orange fingernail. His toes and toenails also sharing this unusual appearance as his fingers and fingernails. Akaza wore little and only sported a short, sleeveless dark purple-pink haori cut off at his waist, left open to expose his chest, and decorated by a square pattern on his back. Below this, he sported a pair of baggy white pants that he rolled to just below the knee with a turquoise rope belt to secure them at his waist, with bright pink tassel ornaments hanging on the front