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Kotetsu ( () (てつ) Kotetsu?) is a supporting character in Demon Slayer: Kimetsu No Yaiba. He is a young villager from the Swordsmith Village. His ancestors built the battle doll Yoriichi Type Zero.[4]

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Kotetsu is a child of short stature, pale skin tone, and Đen hair. He wears a striped yukata and a Hyottoko mask (with notable eyebrows and cheek prints) that fully conceals his face. It is said that his face looks exactly lượt thích his mask. The kanji for Hyottoko ( (ひょっ) (とこ) Hyottoko?) is written on the back of his yukata.


Kotetsu is a kind and energetic child. He is full of passion for his job of maintaining the battle doll Yoriichi Type Zero, even though he has not yet mastered the repairs. This causes him much initial grief and fear, as should the doll break, no one but him is skilled enough lớn fix it. However, after meeting Tanjiro Kamado he realizes that he cannot give up. He is often very frank and blunt at times. Despite this, he means the best and tries his hardest lớn help those around him. 

While at times he seems insecure and weak-willed, as shown when he attempting lớn argue with Muichiro Tokito's harsh but true statements, Kotetsu can also be hot-headed and barbed tongued. Without Muichiro lớn see him in the company of Tanjiro, he openly insulted the Hashira on multiple occasions, which shocked Tanjiro with his sharp contrast in demeanour.

Despite initially bearing a grudge on the Mist Hashira, Kotetsu openly wept and repeatedly thanked Muichiro for saving him from a demon attack, even taking back his hatred and insults (which Muichiro did not even know about). He began begging Muichiro lớn save Kozo Kanamori and Hotaru Haganezuka, showing that he is open lớn changing his feelings towards people and be on better terms.


Kotetsu was born lớn a family of swordsmiths dating back lớn the Sengoku period, over 300 years before the Taisho period. His ancestors built an advanced battle doll modelled after a Demon Slayer named Yoriichi Tsugikuni and it was used lớn practice swordsmanship and refine the skills of other Demon Slayers.

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His father died unexpectedly, leaving him a lonely orphan; he was an only child. Unfortunately, this also meant that he alone had the knowledge about the inner workings of the doll and should it break, no one but him can repair it. This led him lớn be protective of the doll lớn avoid further damage.


Muichiro Tokito[]

In the beginning, their relationship was not very good, as Muichiro tried lớn force Kotetsu lớn lend him the key sánh he can fight against Yoriichi Type Zero, even going into lengths lớn almost insult Kotetsu's job as a swordsmith. This made Kotetsu bear a grudge against Muichiro, talking behind his back lượt thích calling him "seaweed head." However, later when Gyokko uses his blood demon art lớn summon fish demons, Muichiro saves Kotetsu after being reminded of Tanjiro telling him lớn help others in need of it. Shortly after he saves Kotetsu, they were quickly on better terms with each other.

Tanjiro Kamado[]

Kotetsu sees Tanjiro as a friend. At first, Tanjiro defended Kotetsu when Muichiro and Kotetsu were arguing over the key, but Kotetsu shoved Tanjiro away when he tried lớn help him. Tanjiro was knocked out by Muichiro afterwards but woke up lớn see Kotetsu still there, who thanked him for standing up lớn him. Whilst watching Muichiro fight against Yoriichi Type Zero, Kotetsu runs off and Tanjiro follows him. Tanjiro later finds Kotetsu in the tree and encouraged him lớn keep going and work hard, even getting lớn the point where he appears in front of Kotetsu and flicked his chin. Later, Tanjiro trains with Yoriichi Type Zero while having Kotetsu scold him for each of his failures. However, Kotetsu helped Tanjiro work hard and eventually Tanjiro won against Yoriichi Type Zero. Kotetsu was said lớn have a "venomous tongue" by Tanjiro.

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Swordsmith Village Arc[]


Overview: Despite his young age, he has shown lớn be a skilled teacher and trainer, as shown when he asks Tanjiro lớn face Yoriichi Type Zero. Kotetsu also corrected the posture and mistakes that Tanjiro made and how he had survived this way, which indicates that Kotetsu has had some trouble with demons.


  • Kotetsu's actual face bears a striking resemblance lớn his mask, sánh much sánh that people say he doesn't really need lớn wear the mask.[5]
  • He is an orphan with no siblings.[2]




[v · e · ?]


Demon Slayer Corps
Ubuyashiki Family: Kagaya Ubuyashiki · Amane Ubuyashiki · Hinaki Ubuyashiki · Nichika Ubuyashiki · Kiriya Ubuyashiki · Kuina Ubuyashiki · Kanata Ubuyashiki
Hashira: Giyu Tomioka · Mitsuri Kanroji · Obanai Iguro · Sanemi Shinazugawa · Gyomei Himejima · Kyojuro Rengoku · Tengen Uzui · Muichiro Tokito · Shinobu Kocho · Kanae Kocho · Sakonji Urokodaki · Jigoro Kuwajima · Shinjuro Rengoku
Demon Slayers: Tanjiro Kamado · Zenitsu Agatsuma · Inosuke Hashibira · Genya Shinazugawa · Kanao Tsuyuri · Murata · Ozaki · Masachika Kumeno · Yoriichi Tsugikuni
Butterfly Mansion: Aoi Kanzaki · Sumi Nakahara · Kiyo Terauchi · Naho Takada · Goto
Other/Associates: Sabito · Makomo · Suma · Makio · Hinatsuru · Masao Maeda
Demons: Muzan Kibutsuji · Nezuko Kamado · Tamayo · Yushiro · Chachamaru · Susamaru · Yahaba · Temple Demon · Hand Demon · Tongue Demon · Horned Demon · Swamp Demon · Serpent Demon · Spider Demon (Father) · Spider Demon (Mother) · Spider Demon (Son) · Spider Demon (Daughter)
Twelve Kizuki: Kokushibo · Doma · Akaza · Nakime · Hantengu · Gyokko · Gyutaro · Daki · Kaigaku · Enmu · Rokuro · Wakuraba · Mukago · Rui · Kamanue · Kyogai
Kamado Family: Tanjuro Kamado · Kie Kamado · Takeo Kamado · Hanako Kamado · Shigeru Kamado · Rokuta Kamado · Sumiyoshi Kamado · Suyako Kamado · Sumire Kamado
Swordsmith Village: Tecchin Tecchikawahara · Hotaru Haganezuka · Kozo Kanamori · Kotetsu · Tetsuido
Tsuzumi Mansion: Teruko · Shoichi · Kiyoshi
Entertainment District: Koinatsu · Omitsu
Other: Akeno Tsugikuni · Senjuro Rengoku · Ruka Rengoku · Yuichiro Tokito · Kotoha Hashibira · Hisa · Saburo · Kazumi · Satoko · Tokie · Rei · Keizo · Koyuki · Takaharu · Toyo · Uta · Shizu Shinazugawa · Kyogo Shinazugawa · Tsutako Tomioka
Animals: Chachamaru · Kasugai Crows · Ninju
Kamado Family: Kanata Kamado · Sumihiko Kamado
Agatsuma Family: Toko Agatsuma · Yoshiteru Agatsuma
Other: Aoba Hashibira · Tojuro Rengoku · Tenma Uzui · Giichi Tomioka · Sanehiro Shinazugawa
Spin-Off/Anime Original Characters
Civilians: Yae · Taro · Fuku · Tomi
Demons: Matazo · Hairo · Flute Demon · Ubume · Slasher