Kokushibō

* Anime
* Manga

### Alias

Michikatsu Tsugikuni (継 (つぎ) 国 (くに)  巌 (みち) 勝 (かつ) , *Tsugikuni Michikatsu*?) (Human)
Upper Rank One (上 (じょう) 弦 (げん) の壱 (いち) , *Jōgen no Ichi*?)
Secretary Kokushibo (Kimetsu Academy)

## Characteristics

### Race

Demon
Human (Formerly)

### Age

17 - 24 (Human)
 468 (Chronologically)

### Eye Color

Yellow-Orange with Red Sclera (Demon)
Dark Purple (Human)

## Affiliation

### Affiliation

Demon Slayer Corps (Formerly)
Twelve Kizuki

## Personal Status

### Relative(s)

Unnamed Father
 Akeno Tsugikuni (Mother)
 Yoriichi Tsugikuni (Younger Brother)
 Unnamed Wife
 Eijiro Tsugikuni (Son)
 Masao Tsugikuni (Son)
 Uta (Sister-in-law)
 Unnamed Descendants
 Yuichirō Tokitō (Descendant)
 Muichirō Tokitō (Descendant)

## Debuts

### Manga Debut

Chapter 98 (Partial Appearance)
Chapter 99 (Full Appearance)

## Portrayal

### English VA

Jonah Scott

**Kokushibō** (黒 (こく) 死 (し) 牟 (ぼう) , *Kokushibō*?) (1446 - 1913) was a secondary antagonist of *Demon Slayer: Kimetsu no Yaiba*. He is a demon affiliated with the Twelve Kizuki, holding the highest position, Upper Rank One (上 (じょう) 弦 (げん) の壱 (いち) , *Jōgen no Ichi*?).

During the Sengoku Era nearly five centuries ago, Kokushibo was a human by the name of Michikatsu Tsugikuni (継 (つぎ) 国 (くに)  巌 (みち) 勝 (かつ) , *Tsugikuni Michikatsu*?), and the older twin brother of Yoriichi Tsugikuni, the strongest Demon Slayer that had ever existed.

Kokushibō is also the ancestor of Muichirō Tokitō and Yuichirō Tokitō and the one responsible for turning Zenitsu Agatsuma's senior, Kaigaku into a demon and joining the Twelve Kizuki.

## Appearance

Kokushibo is a tall man with a muscular build and pale skin 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*?) and daiji for One (壱 (いち) , *Ichi*?) engraved in them while his other sets of eyes feature black pupils and a cracked pattern in the irises. Kokushibo also has red markings resembling flames on the top left side of his forehead and the bottom right of his chin. His appearance is described to be profoundly majestic and dignified by Muichirō Tokitō.

Kokushibo wears a purple-and-black hexagonal patterned nagagi kimono and black umanori-styled hakama pants tied with a white uwa-obi. 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.

As a human, Kokushibo's look was almost identical to his demon form, except for the amount of eyes, his eminent eyebrows, and less light skin. His eyes had dim purple irises and normal, white sclera as a human. As a child, he was normally seen wearing a white kimono as opposed to the purple-and-black patterned one he's seen wearing as an adult.

After being beheaded by Sanemi Shinazugawa and Gyomei Himejima, Kokushibo evolves into a more grotesque and monstrous form, with protruding fangs and mandibles, large white horns on the front and and back of his head, pointed nails, red outgrowths on his face, his pupils looking at different directions, shorter and messier hair, several thin tubes poking out of his body, and numerous black and red scorpion tail-like appendages haphazardly sprouting all across his entire body.

## Personality

Kokushibo is reserved, silent, and aloof, maintaining an aura of unnerving tranquility and mystery that compliments 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, punctual, and he shows a great deal of respect to the hierarchy of the Twelve Kizuki, as seen at the Upper Rank gathering. Kokushibo is shown to be humble as well, and he did not hesitate to admit his failure or complain of any difficulty.

Kokushibo 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, bordering on cruelty. His threats are severe and demand absolute obedience.

Kokushibo is shown to be genuinely delighted when the opponents he faced challenged him; such as helping dress Muichiro Tokito's amputated hand over his talented swordsmanship, praising Gyomei Himejima for his unparalleled human abilities and sparing Akaza because he enjoyed the challenge of battling him. However, due to this, he also felt irritation after he realized Akaza had died and he pities Gyomei for his impending death from unlocking his Demon Slayer Marks.

He possesses a complex relationship with his human past. He shows something of warmth towards his descendant, Muichiro, commending his skills and resolve, and being moved to convert Muichiro into a demon to spare his life. When their battle comes to an end Kokushibo displays his regret at having struck down his descendants. At the same time, he refers to Muichiro and his abilities as the natural result of his "cells" being passed down.

In his duel against Gyomei, the demon's banter suggests a fear of death. When Gyomei's marks appear, Kokushibo preemptively bemoans the loss of a talented fighter and he urged him to become a demon to continue honing his skills. He seemed surprised when Gyomei vehemently rejected his offer and called his mentality pathetic.

It is revealed that as a human, Kokushibo harbored an immense sense of envy towards his younger twin brother for his natural talent and incredible abilities. These feelings of jealousy and contempt only became stronger upon seeing his brother become a peerless warrior of unmatched caliber among even the Demon Slayer Corps, with none of the Hashira coming close to his level of strength. This envy peaks when he discovers that Yoriichi was still alive and in old age, despite the curse of the Demon Slayer Marks supposedly killing him before he turned 25.

However, despite this immense jealousy, spite, and the outright hatred he harbors for Yoriichi, he still deeply cares for his brother, as seen when he was touched by Yoriichi treasuring the handmade flute he had made for him as children; Kokushibo sheds tears over his brother's death, and even goes as far as keeping the flute itself for the following centuries as a memento.

Kokushibo's fear of defeat stems from his inferiority complex and desire for strength. This fear causes him to become increasingly aggressive and desperate in battle, relying on his demon powers. However, as he faces off against the Hashira, Kokushibo realizes the heavy cost of his pursuit of strength. He becomes a grotesque monster, far from his idealized vision of becoming the strongest samurai like his brother, highlighting how his ambitions and resentment have twisted him.

In his final moments, he is filled with regret, sorrow, and rage, lamenting his life choices. He questions if the path he chose was truly the right one. As he disintegrates, Kokushibo angrily asks his deceased brother why he was even born, expressing his frustration at not achieving his desires.

## Abilities and Powers

**Overall Abilities:** As the highest ranking member of the Twelve Kizuki, Kokushibo is an extraordinarily powerful demon, second only to the Demon King Muzan Kibutsuji himself. He has battled countless Demon Slayers and has amassed vast experience and knowledge over his near 500-year long life. His abilities have been refined to the highest level as he is not only a master of Total Concentration Breathing, but also a marked individual who has gained access to the Transparent World, as well as the demon that possesses the highest concentration of Muzan's blood in the organization.

These overall abilities and skills allowed Kokushibō to defeat two Hashira with minimal effort and then fight against both Sanemi and Gyomei, the latter of which was considered to be the most powerful Demon Slayer in the Demon Slayer Corps. Even when Gyōmei, Sanemi, Seiji and Hoshiko awakened their Demon Slayer Marks, which increased one's physical abilities way above their normal limit, he was still capable of holding his own against the both of them simultaneously.

When he started using his more of his power, Kokushibō managed to overwhelm both Gyōmei, Sanemi, Seiji, Yukinari, both of whom were boosted by their Demon Slayer Marks. As a testament to his might, it ultimately took a combo of attacks from Gyōmei, Sanemi, Muichirō and Genya to even land a significant injury on him. In the end, Kokushibō's loss was mostly a result of his sudden choice to stop regenerating and began crumbling due to realizing his mistake, rather than the skills of his opponents.

### Physical Abilities

* **Immense Strength:** Kokushibō has displayed incredible physical strength, lifting a gigantic sword that is three times heavier than a regular katana and swinging it incessantly at subsonic speeds without rest or effort. Since he assimilated far more of Muzan Kibutsuji's blood than Upper Rank 3, Akaza along with being a Demon Slayer prior to becoming a demon, it can be safely assumed that Kokushibō possessed greater physical strength than him.

* **Immense Speed and Reflexes:** Kokushibō possessed immense levels of speed, as shown when he outpaced Muichirō's Breathing Techniques with great ease. Muichirō himself stated that Kokushibō's speed was in another dimension compared to the Hashira. Sometimes he could unleash bursts of speeds or sword slashes that evade the senses of both Sanemi Shinazugawa and Gyōmei Himejima. He could also move so fast that it made him seem like he teleported.

* **Unlimited Stamina and Endurance:** Kokushibō possesses absolute and infinite stamina and vitality, never tiring and always remaining in optimal physical and mental condition all the time as well as being able to endure waves of onslaught as if it were nothing. Despite having his ear, then limbs and whole chunks of his body being repeatedly torn off and destroyed, he never once showed a sign of pain or agony. Even when his head was being crushed by Gyomei Himejima]'s spiked flail, he remained resilient.

* **Immense Durability:** Kokushibō had displayed immense physical durability as seen when despite Gyōmei using both his flail and axe to attack both ends of his neck, it still didn't budge. His neck was only severed thanks to both the combined efforts of both Gyōmei and Sanemi putting all of their strength into forcing his neck to be sliced with Gyōmei's axe, along with both of their weapons turning crimson red.

### Mental Abilities

* **Tactical Intellect:** As a talented swordsman who has existed for over four centuries, Kokushibō has experienced countless battle situations and threats which he has learnt to overcome and circumvent. This was displayed during his battle with three Hashira and Genya Shinazugawa, where he was able to adapt to their special and unique fighting styles and tactics nigh instantaneously after witnessing it. For example, after Muichirō Tokitō unleashed his first attack against the Upper Rank, he was able to determine he was a user of Mist Breathing, a talented one at that. This was further accentuated through Kokushibō being able to take on Seiji Yukinari, Hoshiko Mimori, Mai Yasuraoka, Toda Momiji, Sanemi Shinazugawa and Gyōmei Himejima simultaneously despite all of them being marked and being users of different Breathing Styles, meaning he’d have to deal with multiple vastly different opponents at once. Which he did so successfully, even overwhelming them multiple times.

### Supernatural Abilities

* **Immense Regeneration:** Kokushibō possessed incredible regeneration, able to regenerate his ear and right arm after getting cut by Gyōmei with no effort. Later, upon being decapitated by two Hashira, Kokushibō was able to regenerate his entire head and successfully conquered death by beheading, a feat only accomplished by two other Demons: Akaza and Muzan. However, the process was slower than with Muzan and more unstable than Akaza, causing him to take on a monstrous form.

* **Demon Slayer Mark:** A special Mark worn by certain "awakened" Demon Slayers that resembles Demon Marks. Its specific abilities are unknown, but what is know is that it drastically improves the abilities of the Demon Slayer, making them much stronger, faster and able to react quicker than what they can achieve normally, though at the cost of being cursed to die at the age of 25. As a Demon, not only was Kokushibō no longer bound by the curse, but the Mark's abilities were enhanced even further than when he was a human.
	+ **Transparent World** (透 (す) き通 (とお) る世 (せ) 界 (かい) , *Sukitōru Sekai*?): Similar to Tanjirō, Kokushibō has obtained the ability to see the "Transparent World". This grants him superhuman kinetic vision similar to Kanao Tsuyuri, allowing him to see the muscles, blood flow, and joint movement of his opponents. He can accurately predict and anticipate the movements and attacks of his opponents with this ability. He was also able to identify that Muichirō was his descendant, immediately discern the skill level of Muichirō, Sanemi, and Gyōmei with one look, and see that Genya Shinazugawa consumed Demons to gain strength by looking into his cellular structures.

* **Flesh Manipulation:** Like all Demons, Kokushibō possesses the ability to manipulate his flesh. He used this ability to grant himself multiple eyes that augment his vision to supernatural levels. He has also used this ability to create an extremely durable and sharp katana, complete with a handguard and scabbard. Because of this, his katana can never be destroyed as he can regenerate it like he would with normal wounds.
	+ **Sword Manipulation:** Kokushibō reveals that he had detached some of his own flesh and shaped it into the katana that he uses in battle. The blade possessed numerous eyes in the blade, handle, and guard, allowing him to have an increased range of vision while using it in battle. Since the blade was also created from his flesh, it could easily regenerate if destroyed or chipped. This ability is shown when the blade returns to its original shape in his battle with Gyōmei. Kokushibō also displayed the ability to freely manipulate the form of the blade, growing three additional blades from the original blade to increase its reach and further increase its size. While engaging in combat, he can manipulate the length and size of his sword strikes, allowing him to cover a distance normally unachievable by a human swordsman. Later, Kokushibō also displayed the ability to grow and protrude multiple blades from his own body, allowing him to perform a multitude of slashes from them without a swinging motion. This attack was powerful enough to easily blow away two Hashira and destroy Genya's Blood Demon Art, as well as slice in half numerous columns in the room, from just its activation; the full usage of the Blood Demon Art being unknown.
	+ **Demonic Transformation:** Later, upon regrowing his head while battling Gyōmei, Seiji, Hoshiko and Sanemi, Kokushibō was able to transform himself into a demonic, monstrous form with several appendages on his back that enhanced all of his abilities and powers to presumably the same level as the Demon King, Muzan Kibutsuji.

**Blood Demon Art** (血 (けっ) 鬼 (き) 術 (じゅつ) , *Kekkijutsu*?):

* **Crescent Moon Blades:** Complementing his combat style: the Moon Breathing, his Blood Demon Art allows him to create dozens of sharp blades shaped like a crescent moon with every sword slash that constantly change in size, length and speed. The crescent blades have been shown to be either bright yellow or bright blue in color. This enhances the lethality of his techniques, allowing him to overwhelm a marked Hashira, Muichirō Tokitō and keep up with two other stronger marked Hashira, Sanemi Shinazugawa and Gyōmei Himejima.

### Miscellaneous Abilities

* **Enhanced Senses:** Like all Demons, Kokushibō possesses incredibly refined senses, including his five senses as well as others. This was shown when Genya Shinazugawa was out of Kokushibō's sight, poised to attack the Upper Rank when he was talking to Muichirō Tokitō, when suddenly, when he attacked, Kokushibō appeared behind Genya, displaying his sensory abilities.
	+ **Enhanced Vision:** As Kokushibō possesses 3 pairs of eyes, his eyesight has not only been augmented physically, but supernaturally as well, allowing him to access the Transparent World and augment his vision to nigh-superhuman levels, allowing him to perceive multiple attacks from multiple directions seemingly outside his line of sight.

* **Indomitable Will:** Solely because of his goal to surpass his younger twin brother, Yoriichi Tsugikuni, Kokushibō possesses an indomitable and undaunted will and spirit. When he was about to get killed, he forced his regeneration to evolve, and regrew his own head with a myriad of enhancements, all because he didn't allow himself to die until he accomplished his goal.

### Fighting Style

* **Master Swordsman:** Due to training and refining his swordsmanship skill for over 400 years and getting a major boost to his physical capabilities, Kokushibo has become the most powerful and skilled swordsman in the modern era, and the second strongest swordsman in existence, behind his younger twin brother, Yoriichi Tsugikuni. With his phenomenal skill in wielding a katana, he could singlehandedly take some of the strongest Hashira in the Demon Slayer Corps when they were marked as well as a marked child prodigy and a Demon Slayer gifted with the ability to gain demonic abilities.

* **Enhanced Breathing Techniques**: As a Demon, Kokushibō's Breathing Techniques has been enhanced to heights beyond even what Hashira can achieve. His former position along with swordsmanship abilities was analogous, more than likely surpassing to that of a Hashira prior to becoming a Demon, as well as his Demon Slayer Mark and being an Upper Rank, showing that his skill and efficiency with **Total Concentration Breathing** (全 (ぜん) 集 (しゅう) 中 (ちゅう) の呼 (こ) 吸 (きゅう) , *Zen Shūchū no Kokyū*?) is almost unparalleled, with only his naturally-gifted brother surpassing him.

### Swordsmanship

**Moon Breathing** (月 (つき) の呼 (こ) 吸 (きゅう) , *Tsuki no kokyū*?): Like Kaigaku, Kokushibō was a Demon with a Breathing Style. His Moon Breathing was one of the most dangerous sword styles displayed thus far. Sanemi noted that each and every slash and cut he made using this breathing style was surrounded by chaotic, crescent moon-like blades that constantly changed size and length, increasing the range of his already powerful attacks. Kokushibō himself had continued to develop this breathing style and had created multiple techniques over the centuries he had lived.

1. **First Form: Dark Moon, Evening Palace** (壹 (いち) ノ型 (かた)  闇 (やみ) 月 (づき) ・宵 (よい) の宮 (みや) , *Ichi no kata: Yamidzuki - Yoi no Miya*?) - Kokushibo draws his katana and performs a singular horizontal slash following a crescent shape, creating numerous chaotic crescent blades along its path, before sheathing it back into his scabbard. This technique is extremely reminiscent of Iaijutsu.
2. **Second Form: Pearl Flower Moongazing** (貳 (に) ノ型 (かた)  珠 (しゅ) 華 (か) の弄 (ろう) 月 (げつ) , *Ni no kata: Shuka no Rōgetsu*?) - Kokushibo performs three crescent-shaped slashes while releasing a multitude of crescent moon blades along with them.
3. **Third Form: Loathsome Moon, Chains** (參 (さん) ノ型 (かた)  厭 (えん) 忌 (き) 月 (づき) ・銷 (つが) り, *San no kata: Enkizuki - Tsugari*?) - Kokushibo performs two extremely broad crescent-shaped slashes directly in front of him, from which a storm of smaller crescent moon blades are released.
4. **Fourth Form: Solar Rings, Frostmoon** (肆 (し) ノ型 (かた)  太 (たい) 陽 (よう) 輪 (りん) ・霜 (しも) 月 (づき) , *Shi no kata: Taihyōrin - Shimodzuki*?) - Kokushibō .
	* **Fourth Form: Improved, Red Sun over Paradise** (肆 (し) ノ型 (かた) ・改 (かい)  緋 (あっき) 陽 (よう) 樂 (らく) 薗 (えん) , *Shi no kata kai: Akk'yō Rakuen*?) - Kokushibō.
5. **Fifth Form: Moon Spirit Calamitous Eddy** (伍 (ご) ノ型 (かた)  月 (げっ) 魄 (ぱく) 災 (さい) 渦 (か) , *Go no kata: Geppaku Saika*?) - Kokushibo creates multiple long and curved slashes layered over one another, essentially creating a vortex of crescent moon blades. As stated by Sanemi Shinazugawa, this technique was performed without Kokushibo swinging his katana.
6. **Sixth Form: Perpetual Night, Lonely Moon - Incessant** (陸 (ろく) ノ型 (かた)  常 (とこ) 夜 (よ) 孤 (こ) 月 (げつ) ・無 (む) 間 (けん) , *Roku no kata: Tokoyo Kogetsu - Muken*?) - Kokushibo rapidly performs a multitude of curved slashes several meters in front of him that releases a wild barrage of crescent moon blades capable of slicing up the surroundings.
7. **Seventh Form: Mirror of Misfortune, Moonlit** (漆 (しち) ノ型 (かた)  厄 (やっ) 鏡 (きょう) ・月 (づき) 映 (ば) え, *Shichi no kata: Yakkyō - Dzukibae*?) - Using his altered katana, Kokushibo performs a frontal crescent-shaped slash that unleashes numerous straight and curved slashes that expand outward.
8. **Eighth Form: Moon-Dragon Ringtail** (捌 (はち) ノ型 (かた)  月 (げつ) 龍 (りゆう) 輪 (りん) 尾 (び) , *Hachi no kata: Getsuryū Rinbi*?) - Using his altered katana, Kokushibo performs a massive long-ranged curved slash that leaves dozens of crescent moon blades along its path.
9. **Ninth Form: Waning Moonswaths** (玖 (く) ノ型 (かた)  降 (くだ) り月 (づき) ・連 (れん) 面 (めん) , *Ku no kata: Kudaridzuki - Renmen*?) - Using his altered katana, Kokushibo performs multiple curved slashes, all in close proximity, that leave numerous crescent moon blades along its path.
10. **Tenth Form: Drilling Slashes, Moon Through Bamboo Leaves** (拾 (じゅう) ノ型 (かた)  穿 (せん) 面 (めん) 嶄 (ざん) ・蘿 (ら) 月 (げつ) , *Jū no kata: Senmenzan - Ragetsu*?) - Using his altered katana, Kokushibo creates three rotating circular saw-like slashes with crescent moon blades following their path.
11. **Eleventh Form: Cosmic Infernadoes** (拾 (じゅう) 壹 (いち) ノ型 (かた)  遠 (えん) 大 (だい) 焦 (しょう) 龍 (たつ) 卷 (まき) , *Jū Ichi no kata: Endai Shōtatsumaki*?) - Kokushibō twirls his blade to create multiple chaotic structures of pure slashes that bear striking resemblance to actual tornadoes/cyclones that slowly chase down their foes. In addition to that, the chaotic blades emanating from the slashes act much like debris from the respective disaster.
12. **Twelfth Form: Waxing Moonstones** (拾 (じゅう) 貳 (に) ノ型 (かた)  上 (のぼ) る月 (づき) ・月 (げっ) 長 (ちょう) 石 (せき) , *Jū Ni no kata: Noborudzuki Gecchōseki*?) - Kokushibō .
13. **Thirteenth Form: Midnight Anarchy, Animosity** (拾 (じゅう) 參 (さん) ノ型 (かた)  真 (ま) 夜 (よ) 中 (なか) 無秩 (むちつ) 序 (じょう) ・敵 (てき) 意 (い) , *Jū San no kata: Mayonaka Muchitsujō - Teki'i*?) - Kokushibō .
14. **Fourteenth Form: Catastrophe, Tenman Crescent Moon** (拾 (じゅう) 肆 (し) ノ型 (かた)  兇 (きょう) 変 (へん) ・天 (てん) 満 (まん) 繊 (せん) 朏 (げつ) , *Jū Shi no kata: Kyōhen - Tenman Sengetsu*?) - Using his altered katana, Kokushibo performs a multitude of curved slashes which expand outward in every direction that incrementally grow in size, essentially creating an omni-directional vortex of crescent moon blades that surrounds him.
15. **Fifteenth Form: Orbiting Destructive Worlds, Creation** (拾 (じゅう) 伍 (ご) ノ型 (かた)  周 (しゅう) 回 (かい) 破 (は) 壊 (かい) 的 (てき) な世 (せ) 界 (かい) ・創造 (そうぞう) , *Jū Go no kata: Shūkai Hakai-Tekina Sekai - Sōzō*?) - Kokushibō swings his enlarged flesh sword along with the blades emerging from his flesh around his body in order to create dozens of chaotic slashes that completely surround and orbit around his entire body. This can be used for both offensive and defensive capabilities.
16. **Sixteenth Form: Moonbow, Half Moon** (拾 (じゅう) 陸 (ろく) ノ型 (かた)  月 (げっ) 霓 (こう) ・片 (かた) 割 (わ) れ月 (づき) , *Jū Roku no kata: Gekkō - Katawaredzuki*?) - Using his altered katana, Kokushibo swings upward, sending six curved slashes crashing down several meters in front of him, powerful enough to leave craters in their wake.
17. **Seventeenth Form: Lunar Beacon, Twilight** (拾 (じゅう) 漆 (しち) ノ型 (かた)  月 (つき) 標 (ひょう) 識 (しき) 灯 (とう) ・黄 (たそ) 昏 (がれ) , *Jū Shichi no kata: Tsukihyōshiki-tō - Tasogare*?) - Kokushibō points his sword towards the moon itself charging a gargantuan laser towards his sword thus greatly increasing the power and devastation of his slashes.
18. **Eighteenth Form: Waxing Forth, Burning Sky** (拾 (じゅう) 捌 (はち) ノ型 (かた)  満 (み) ち欠 (か) け前方 (ぜんぽう) ・下 (した) 火 (び) 上 (じょう) 虚 (くう) , *Jū Hachi no kata: Michikake Zenpō - Shitabi Jōkū*?) - Kokushibō raises his sword towards the sky and swings downward raining down a plethora of chaotic projectiles.
19. **Ninteenth Form: White Crystal, Moonbeam** (拾 (じゅう) 玖 (く) ノ型 (かた)  白 (はく) 色 (しょく) 結 (けっ) 晶 (しょう) ・月光 (げっこう) , *Jū Ku no kata: Hakushoku Kesshō - Gekkō*?) - Kokushibō pulls his enlarged flesh sword backward and greatly thrusts the blade forward creating an extremely long beam of chaotic slashes in the direction his sword faced.
20. **Twentieth Form: Cataclysmic Calamity, Lunar Extinction** (貳 (に) 拾 (じゅう) ノ型 (かた)  激変災害 (げきへんさいがい) ・月 (つき) 絶滅 (ぜつめつ) , *Ni Jū no kata: Gekihen Saigai - Tsuki Zetsumetsu*?) - Kokushibō unleashes a devastating barrage of slashes and stabs in all directions with the swords emanating from his body within an extremely large radius that decimates anything it makes contact with.

## Equipment

**Flesh Katana:** As a former Demon Slayer and user of a Breathing Style, Kokushibo wields a warped version of a Nichirin katana. Created from his own flesh and blood, his body's immense durability and hardness allows 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 ({{{2}}}) 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. However, it is unknown whether those eyes can be used to extend his vision. His katana's tsuba is circular with four slight indentations, a center with three eyes and several black veins and a golden border. He carries it inside a saya at his waist that shares a similar fleshy appearance. According to the second databook, Kokushibo named his weapon **Kyokokukamusari (虛 (きょ) 哭 (こく) 神 (かむ) 去 (さり) , *Kyokokukamusari, lit. "Hollow Cry of the Godless"*?)**.

**Standard Nichirin Katana:** When Kokushibo was a Demon Slayer, he carried around a traditional Nichirin katana that was light purple in color and had a handguard that is rectangular shaped with 4 angular indentations, with a black center and a golden border. Along with it, he also carried a standard sword sheath that was black in color.

## Battles

Kokushibō Battles

**Pre-Series Battles**

* Eijiro and Masao Tsugikuni vs Michikatsu
* Hizashi Origanbu vs Kokushibō
* Hitotsuyanagi Higashisanjō vs Kokushibō

**Infinity Castle Arc**

* Mai Yasuraoka and Muichirō Tokitō vs Kokushibō
* Seiji Yukinari, Mai Yasuraoka, Hoshiko Mimori, Muichirō Tokitō, Toda Momiji, Genya Shinazugawa, Sanemi Shinazugawa and Gyōmei Himejima vs Kokushibō

**Sunrise Countdown Arc**

* Demon Slayers vs Muzan Kibutsuji and Kokushibō

## Trivia

* Kokushibo's name contains the kanji for "black" (黑 (こく) , *koku*?), "death" (死 (し) , *shi*?) and "eye" (牟 (ぼう) , *bō*?).
* Kokushibo has been challenged three times for his position. One of these battles involved Akaza. While Kokushibo would usually absorb the demon he defeated, he let Akaza live because he enjoyed the challenge.
* Kokushibō is the first Demon Slayer to become a Demon.
	+ He became a Demon in his early 20s and lived as such for additional 460+ years.
* Kokushibo once killed a leader of the Demon Slayer Corps. This caused the Corps to put extreme effort into hiding the residence of future leaders. This event was also the one that caused the Kakushi to be formed.
* The relationship between Yoriichi and Michikatsu parallels the mythology of the Shintō deities Amaterasu and Tsukuyomi, respectively. Amaterasu is the most sacred of Shintō deities, the sun goddess. Tsukuyomi, the moon god, is her former husband and brother. After Tsukuyomi killed Uke Mochi, another Shintō deity, Amaterasu refused to ever look upon him again, moving to another part of the sky and beginning the cycle of day and night. Like the deities, the siblings also feud and have chosen different paths (that of the Demon Slayer and the Demon), developing their respective breathings of the sun and moon.
* Kokushibo ranked 14th in the second popularity poll with 2,938 votes.
* Kokushibo is considered to be a "business partner" by Muzan.

## Quotes

* (To Kaigaku) "*Be thankful for the blood... You are not allowed to spill even a single drop on the ground... for if you do... your torso and head shall have a sorrowful parting.*"
* (In regards to Akaza) "*Akaza's presence is gone. He has fallen. Akaza... weren't you going to defeat me? A path had open for him to attain further heights but he renounced it himself. How exceedingly **weak**.*"
* (In regards to Yoriichi Tsugikuni) "*The old and ugly creature that was once my little brother had pity for me. But... I wasn't angry. Even thought 60 years he had been such an eyesore. The voice calling me "brother" was terribly hoarse. My brother had never shown the slightest emotion... so at the sight of him shedding tears, something welled up in me for the first time since birth. I was confused... at my own unexpected unrest. I must kill... this part of me from when I was human... This old man of brittle flesh past his prime... He was a Demon Slayer, and I must cleave anyone who turns a sword upon me. But his odd sentimentality... disappeared the next moment.*"
* (To himself) "*Have I lived hundred of years for this?... Was I so afraid of defeat that I became a monster?... Did I want to be strong even if it meant eating people?... Did I become this miserable creature because I didn't want to die?... No... Yoriichi... I just... I wanted to be like you...*"
* (To himself) "*I abandoned my wife and children. I abandoned my humanity. I abandoned my samurai past.* *Why could I not leave anything behind? Why can't I become someone known? Why are we so different? Why in the world was I ever born? Tell me... Yoriichi.*"