Kokushibo

Interesting facts
Kokushibo's name contains the kanji for "black" (黒こく, koku?), "death" (死し, shi?), and "eye" (牟ぼう, bo?).
Kokushibo was the brother of the first possessor of the breath of the sun.
Kokushibo is the first hunter to become a demon.
He became a Demon at the age of 20 and lived for another 460+ years.
The demons were scared to death that Muzan could read everything they thought, but Kokushibo never objected to it.
Kokushibo never ceased to be the First Upper Moon.
He was happy when Muzan's favorite Akaza challenged him to a death match to replace him, so he didn't absorb him (he usually absorbed the Moons who challenged him with Muzan's permission).
Including Akaza, he was called upon to fight three times to replace him in rank.

Flesh Sword - Kokushibo reveals that he separated part of his flesh and shaped it into the katana he now wields. The sword is dotted with eyes on the blade, hilt, and guard, increasing his range of vision in combat. Furthermore, since the sword is crafted from Kokushibo's flesh, it easily regenerates damage. This ability was demonstrated when the blade returned to its original form during his fight with Gyomei Gimejima. Kokushibo later freely altered the sword's form, growing three additional blades to increase its reach. He can also regrow blades from his body.

Breath of the Moon
Kokushibo uses the Breath of the Moon, one of the most dangerous in the world. Shinazugawa Sanemi noted that when Kokushibo swings his sword using this style, he surrounds the opponent with chaotic, crescent-shaped movements that constantly change size and length, thereby increasing the range of damage.

First Style: Dark Moon: Evening Shrine (壱ノ型 闇月・宵の宮 Ichi no kata: Yami zuki - yoi no miya) - Kokushibo makes a quick attack with his katana, and several crescent moons appear in the trajectory of the cut.
Second Style: Moon Pearl Flowers - Kokushibo creates upward vertical slices around himself.
Third Style: Hateful Moon: Chains - Kokushibo makes many chaotic cuts in front of him.
Fifth Style: Ghost Moon Destruction Whirlwind (伍ノ型 月魄災渦 Go no kata: Geppaku sai ka) - Kokushibo makes several curved slices in layers, similar to an ascending whirlwind. From these slices, numerous chaotic blades emanate. Kokushibo performed this attack without swinging his sword.
Sixth Style: Avichi's Endless Moon (陸ノ型 常夜孤月・無間 Roku no kata: Tokoyo kogetsu - muken) - Kokushibo unleashes a wild storm of blades in many directions. This technique was powerful enough to not only cut through the pillars around him, but also suppress Sanemi Shinazugawa's Wind Pillar.
Seventh Style: Lonely Moon in the Endless Night of Avichi - Kokushibo creates several earth-rending slashes in front of him.
Eighth Style: Moon Ouroboros - Kokushibo performs a wide-range circular attack.
Ninth Style: Waning Moon: Endless Landscape - Kokushibo creates chaotic cuts in all directions.
Tenth Style: Cut: Moonlight shining through bamboo leaves
Fourteenth Style: Disaster - Immortal Proud Crescent - a multitude of horizontal slashes surrounding Kokushibo in such a way that he cannot be approached.
Style Sixteen: Rainbow Crescent - vertical attacks that crush the ground.

Demon Blood Technique
Flesh Sword (Kekkijutsu, Kekkijutsu): While the specific name of the Blood Demon Technique is unknown, Kokushibo reveals that he separated a portion of his own flesh and fashioned it into the katana he uses in combat. The blade possessed multiple eyes within the blade, hilt, and guard, allowing him to have an extended range of vision when wielding it in combat. Because the blade was also created from his flesh, it could easily regenerate if destroyed or shattered. This ability is demonstrated when the blade reverts to its original form in the battle with Gyomei. Kokushibo also demonstrated the ability to freely manipulate the blade's shape, growing three additional blades from the original blade to extend its reach and further increase its size. Kokushibo later demonstrated the ability to grow and extend multiple blades from his body, allowing him to deliver multiple blows without hesitation. This attack was powerful enough to easily repel two Hashira and destroy Genya Shinazugawa's Blood Demon Technique, as well as bisect numerous columns in the room with just its activation. However, the full extent of this technique is unknown.

Transparent World (透すき通とおる世せ界かい Sukitōru Sekai): Kokushibo gained the ability to see the "transparent world" through the use of three pairs of eyes. This gives him superhuman kinetic vision similar to Kanao Tsuyuri, allowing him to see the muscles, blood flow, and joint movements of his opponents. He can accurately predict and anticipate his opponents' movements and attacks with this ability. He was also able to identify that Muichiro was his descendant, immediately recognized the skill level of Muichiro, Sanemi, and Gyomei with a single glance, and learned that Genya Shinazugawa consumed demons to gain strength by studying his cellular structures.
Enhanced Regeneration: Kokushibo possessed incredible regeneration, being able to regenerate his right arm after Gyomeyo sliced ​​it. Later, after being decapitated by two of the Pillars, Kokushibo was able to regenerate his entire head and successfully defeated all demons' weakness of death by decapitation, a feat. However, the process took longer than Muzan's and was more unstable than Akaza's, resulting in him taking on a monstrous form.
Demonic Transformation: Later, after growing a head during his battle with Gyomei and Sanemi, Kokushibo was able to transform into a monstrous spider-like form that supposedly enhances all of his abilities.
Telepathic Communication: Kokushibo can be telepathically linked with Muzan due to the large amount of his blood, allowing him to have full conversations with the Demon Lord.

Enhanced Speed: Kokushibo possessed an immense level of speed, as demonstrated when he easily outpaced Muichiro's breathing techniques. Muichiro himself stated that Kokushibo's speed was on a different dimension than that of the Hashira.
Durability: Kokushibo has demonstrated immense physical resilience, as demonstrated when, despite Gyomei using both a mace and an axe to attack his neck, he still remained motionless. His neck was only severed thanks to the combined efforts of Gyomei and Sanemi.
Strength and Reflexes: As a user of a special breath, Kokushibo possesses superhuman strength and reflexes. After becoming a demon, he gained additional advantages thanks to his demon blood.
Demon Slayer's Mark: Kokushibo bears a mark similar to that of some "awakened" Demon Slayers, resembling a Demon's crest. Its specific abilities are unknown, but it is known to greatly enhance a Demon Slayer's abilities, making them much stronger, faster, and more reactive than they normally would be, though at the cost of a curse that prevents him from living past 25 years of age. As a Demon, Kokushibo was not affected by the mark's curse.

Capabilities
Kokushibo was an extremely powerful swordsman, considered the strongest of the Twelve Moons Demons and the second strongest Demon in the series, behind Muzan Kibutsuji. As one of the oldest Demons in the series, he had fought numerous Demon Hunters and had gained a vast amount of experience and knowledge in combat. He was able to easily decipher the techniques and skills of at least two Pillars and overwhelm them in combat. As a breath user, he possessed high levels of strength and reflexes, which were further enhanced by his Demon physiology.

Kokushibo's combined abilities and skills allowed him to defeat two of the Pillars with minimal effort and then fight on par with Gyomei, who was considered the most powerful Demon Slayer in the Corps. Even when Gyomei and Sanemi awakened their Demon Slayer Marks, which increased their physical abilities far beyond their limits, he was still able to face both of them at once.

As he began to use more of his power, Kokushibo managed to overwhelm both Gyomei and Sanemi, both of whom were enhanced by their Demon Slayer Marks. As a testament to his power, it ultimately took a combination of attacks from Gyomei, Sanemi, and Muichiro to cause him serious injury. Ultimately, Kokushibo's death was primarily a result of his sudden inability to regenerate and began to crumble due to the realization of his mistake rather than the skills of his opponents.

It is unknown when exactly he became a demon and joined the Twelve Demon Moons, but the impetus for this decision was the realization that people with the mark do not live past the age of 25. 60 years later, on the night of the blood moon, he met his brother Yoriichi Tsugikuni, who almost cut off his head, but died of old age at the last moment.

Three hundred years ago, Kokushibo encountered a demon hunter who ate demon flesh to increase his powers. Kokushibo defeated him by cutting him in two.

Plot
Red Light District Arch
Kokushibo was summoned to the Upper Moons meeting where the other Moons and Muzan had gathered. He sat silently facing the wall in one of the most remote parts of the Infinity Fortress, only speaking when the Biwa demon acknowledged his presence and when Muzan Kibutsuji arrived.

Muzan spoke of Gyutaro's death, scolding Kokushibo and the other Upper Moons for failing to destroy the Ubuyashiki family and find the Blue Spider Lily. Upper Moon 1 admitted that he had nothing to say in his own defense, as Kagaya Ubuyashiki had hidden too well.

At the same time, a conflict occurred between Akaza and Doma during the meeting, in which Akaza destroyed part of Doma's head with one blow. Kokushibo cut off Upper Moon 3's arm with elusive speed, claiming that he had gone too far. According to Kokushibo, he intervened because of the Upper Moon hierarchy, which had been disrupted by the hot-tempered Akaza and the unresisting Doma. He then suggested that Akaza settle the matter in a conventional way: by challenging Doma to a fight and taking his place. In response, Akaza promised to kill Upper Moon 1, after which Kokushibo only wished him luck before leaving the meeting.

Before meeting Muzan, Kokushibo was a human and one of the strongest demon hunters. He lived during the Sengoku period and perfected his sword skills with a former wind breathing user. It is also known that Kokushibo was familiar with the Wind Pillar. He later had a child who continued his lineage.

Story
Childhood
Kokushibo's real name before meeting Muzan was Michikatsu Tsugikuni.

He was born along with his younger brother, Yoriichi, during the Sengoku period. His family was of high rank. Their father decided to make Michikatsu his heir when he turned 10 and send Yoriichi to the temple. Michikatsu felt sorry for his younger brother, but he was not allowed to approach him. Nevertheless, he approached him and presented him with a homemade flute. This earned him a punch in the face.

When they were both seven years old, Yoriichi asked Michikatsu to try his hand at fencing. Michikatsu was amazed by Yoriichi's skill. Yoriichi defeated his teacher in just a few moves. From then on, Michikatsu despised and envied Yoriichi's talent. When he learned that Yoriichi constantly picked on his mother's weak spot, his hatred grew.

Having learned of Yoriichi's talents, his father decided to make him his heir. Yoriichi ran away from home after his mother's death. Ultimately, he was never found, and Michikatsu became the heir.

Personality
Little is known about Kokushibo, as he is very secretive.

Judging by his behavior at the Upper Moon meeting, one can assume that he is punctual and takes his work very seriously. Kokushibo demonstrates a strong sense of loyalty to Muzan Kibutsuji, and most of the actions of the First Upper Moon are dictated by a desire to be more useful in achieving his leader's goals.

Kokushibo is a man of few words, and although he chooses his words carefully, they sometimes come across harshly due to their terrifying directness. This makes his threats especially terrifying.

Later, we see a more human side of Kokushibo's personality: in memories of his family and brother, he is emotional, not a stranger to experiences, and in a fight with Muichiro, Tokito recognizes him as his descendant and positively evaluates his skill, ultimately offering to become a demon.

Story
Childhood
Kokushibo's real name before meeting Muzan was Michikatsu Tsugikuni.

He was born along with his younger brother, Yoriichi, during the Sengoku period. His family was of high rank. Their father decided to make Michikatsu his heir when he turned 10 and send Yoriichi to the temple. Michikatsu felt sorry for his younger brother, but he was not allowed to approach him. Nevertheless, he approached him and presented him with a homemade flute. This earned him a punch in the face.

When they were both seven years old, Yoriichi asked Michikatsu to try his hand at fencing. Michikatsu was amazed by Yoriichi's skill. Yoriichi defeated his teacher in just a few moves. From then on, Michikatsu despised and envied Yoriichi's talent. When he learned that Yoriichi constantly picked on his mother's weak spot, his hatred grew.

Having learned of Yoriichi's talents, his father decided to make him his heir. Yoriichi ran away from home after his mother's death. Ultimately, he was never found, and Michikatsu became the heir.

Human life
Kokushibo4
Before I became a demon
Before meeting Muzan, Kokushibo was a human and one of the most powerful demon hunters. He lived during the Sengoku period and honed his sword skills with the former wind breath user Ta.

Kokushibo
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Appearance
As a demon, Kokushibo is a pale-skinned, tall, and muscular man with long, spiky black hair with red tips that is tied into a ponytail. His most notable feature is the three pairs of eyes on his face with yellow irises and red sclerae that have black, straight cracks radiating from each iris. His middle set of eyes contain the kanji for "Highest Rank (上じょう弦げん, Jōgen?)" and "One (壱いち, Ichi?)". Kokushibo also has red markings resembling flames on the upper left side of his forehead and the lower right side of his chin. The Mist Pillar, Muichiro Tokito, described his appearance as extremely majestic.[5]

Kokushibo wears a purple and black beehive-shaped nagagi kimono and a black Umanori-style hakama with a white Uwa-obi. He wears a flesh sword with eyes in the space between the tsuka tsuka ito on his belt. It is later revealed that the tsuba and blade have eyes and veins.

As a human, Kokushibo's appearance was nearly identical to his demon form, save for the number of eyes, prominent eyebrows, and noticeably less pale skin. His eyes had dark purple irises and normal white sclera like a human's. As a child, he wore a white kimono, rather than the purple and black patterned one he wore as an adult.

After being decapitated by Sanemi Shinazugawa and Gyomei Himejima, Kokushibo transformed into a more grotesque and monstrous form, with protruding fangs and jaws, large white horns on the front and back of his head, pointed nails, red growths on his face, his pupils facing in different directions, shorter and messier hair, several thin tubes protruding from his body, and numerous black and red scorpion-like tail-like appendages growing randomly all over his body.

Kokushibo (黒死牟 Kokushibo) is the main secondary antagonist of Demon Slayer Blade: Kimetsu no Yaiba and Upper Moon First (上じょう弦げんの壱いち, Jōgen no Ichi?).[1]

Nearly five centuries ago in the Sengoku Period, during the Golden Age of Demon Slayers, Kokushibo was a man named Michikatsu Tsugikuni (継つぎ国くに 巌みち勝かつ, Tsugikuni Michikatsu?) and a former member of the Demon Slayer Corps[2] and the older twin brother of Yoriichi Tsugikuni,[3] the strongest Demon Slayer to ever live.

Kokushibo is also the ancestor of Muichiro Tokito and Yuichiro Tokito[4] and is responsible for Kaigaku's transformation into a demon and joining the Upper Ranks.