The strongest and rarest nichirin sword is the black nichirin blade which belongs to the protagonist, Tanjiro Kamado. This ultra rare sword only appears twice in the anime with the second wielder being Kyojuro Rengoku, the former flame hashira.
The Purple Nichirin sword was used by the Upper-Moon One, Kokushibo. This sword is symbolic of the Moon Breathing style and is definitely one of the strongest within the series.
Black is an extremely rare color for Nichirin blades and indicates that Tanjiro's compatibility might not be with the water breathing style or even the Hinokami Kagura.
Tanjiro Kamado wields a black Nichirin blade, but the symbolism of such a sword was initially unknown. Black blades are seen as a rarity, as demon slayers who wield them are doomed to die young. No wielder of a black sword has ever become a Hashira, either.
The Yoriichi Type Zero sword is the same Nichirin katana that Yoriichi Tsugikuni carried during his time as a Demon Slayer. It is deep black in colour and changes to bright red during combat, a characteristic shared by all Nichirin swords used by the Demon Slayer Corps.
It was Yoriichi's sword, he found it inside Yoriichi Type Zero doll when he destroy the head. And then hotaru took the sword to fix it. Tanjiro also use Kyojuro's tsuba in this sword. He found the sword on Volume 12.
Lavender Nichirin blade
This blade represents the Serpent, the reason why Obanai Iguro's sword resembles the body of a snake. The Serpent Breathing derived from the Water Breathing and the techniques resemble the movements of the animal it represents.
8) Muzan hates being called pale or dead
Muzan is the most powerful demon in the entire series, and is responsible for creating all demons. For someone who considers himself to be perfect, it is natural that he will hate being called pale or dead. This is established quite early on.
Black. Toho Co., Ltd. Black is the most mysterious color of all the blades, and is held by the main character, Tanjiro. It is a rare blade and represents the sun; it also holds a theory that the demon slayers who own this sword are not to live a long life.
Being one of the strongest Hashira, Sanemi's sword matches his appearance. His sword is very durable and lasts throughout the series. It had no problem piercing through the box that Nezuko is held in. He fought against Kokushibo during the final arc of the manga.
Rengoku is easily one of the most lovable Hashira in Demon Slayer. This is why it's a shame that he succumbed to the wounds that he suffered in his fight against Akaza.
Tengen Uzui
He is the fastest Hashira, and the second physically strongest. Obviously, then, Tengen Uzui is rather proud. He is demanding, fussy, boastful, and prone to selfishness.
In the simplest terms, the reason that Genya can't use Breathing Styles stems from his inability to achieve the total concentration breathing that other demon slayers use in order to access their abilities.
1 Sun Breathing
It is a legendary breathing style that mimics the sun itself and incorporates that into the user's swordsmanship. Against the Demons, this is known to be the most effective breathing style as it is extremely versatile.
Wielder(s)
Gram is the strongest Demon Sword also known as the Demonic Emperor Sword.
The entire Demon Slayer corps fights using Nichirin sword since that's the only weakness of the demons. However, Genya is the only one who doesn't have a sword.
During episode three we learned that the Yoriichi Type Zero was built by Kontetsu's ancestors more than 300 years ago, during the Sengoku era.
Tanjuro Kamado a recurring flashback hero from Demon Slayer : Kimetsu No Yaiba. He was the husband of Kie Kamado, and the father of Tanjiro, Nezuko, Takeo, Hanako, Shigeru, and Rokuta.
Nichirin swords are unique to the swordsman and are known as color-changing swords because the blade's exterior will change to reflect its user; however, a black nichirin sword is said to be bad luck -- and only two known users in Demon Slayer have weilded one.
This is the sword that appeared out of the neck of the doll at the end of Demon Slayer season three's second episode. In the manga Tanjiro has the sword repaired by Haganezuka, who he initially traveled to the Swordsmith Village to find.
He was a genius when it came to swordsmanship and nearly killed Kibutsuji Muzan all by himself. So now, Tanjiro, the protagonist of the Demon Slayer series, has access to a sword that belonged to the best swordsman to have ever lived.
Some of the characters who have faced Yoriichi and survived
This happened due to a treatment that had gone wrong. While he was being treated, Muzan killed the doctor because he was not able to observe any results.