reason why Nezuko can't heal him because his illness is . not based on some demons blood demon. art. It's actually a curse the Ubuyashiki family is stricken with because Muzan.
Nezuko first unlocked Exploding Blood during Tanjiro's fight with Lower Rank Kizuki Rui, and it has the power to turn her blood into a fire that burns demons, and only demons. Thanks to that, Nezuko was able to burn away the poison inside of Inosuke and Tengen without hurting them any more than they already were.
Nezuko heals Inosuke by setting him on fire. The siblings rush over to him and Tanjiro attempts to wake Inosuke up, but to his dismay he feels his heart get weaker.
Immense Regeneration: As a demon, Nezuko has enhanced regenerative abilities that allow her to heal in the blink of an eye.
Apart from Tanjiro, the show centers on his younger sister Nezuko Kamado, turned into a demon by Muzan Kibutsuji. Demons are incapable of walking out in broad daylight because the sunlight will burn them into the ashes. However, Nezuko has immunity against the sun, so she was given the name “The Chosen Demon”.
However, the trait that sets her apart from all other demons is the fact that she has the ability to conquer the sun, prompting the Demon King to call her the "chosen demon". Abnormal Demon Physiology: As the "chosen demon", Nezuko has several unique demonic traits that set her apart from all other demons.
So, in conclusion, her coming from a Sun Breathing user's lineage and not relying on human substance are perhaps the reasons for her immunity. Hence, Muzan was searching for the Blue Spider Lilly, a flower that was a crucial ingredient in the medicine used by the doctor who saved his life.
Nezuko, on the other hand, never was under Muzan's curse, it would seem. Instead, she used her will to protect her brother and other humans to fight off the curse. This is probably why Nezuko sleeps instead of eating humans. This also means her strength as a demon is based on her will to protect rather than feed.
She was ranked in 3rd place in the first Demon Slayer character popularity poll with 3,319 votes. IGN regarded Nezuko as one of the series's most popular characters and noted how her design elaborates the way she sees humans as good people as a result of hypnosis.
Nezuko is at least stronger than Daki, meaning that if Muzan could bring her back under his control, she would certainly qualify for the most prestigious title a demon can hold: a member of the Twelve Kizuki. Thanks to Nezuko's remarkable strength, she would have to be an Upper-Moon.
He was in a deep slumber and Nezuko wanted to wake her brother up. She decided to use her Blood Demon Art after failing to wake him up by nudging him. The animation of the flames that healed Tengen Uzui, Tanjiro Kamado and Inosuke Hashibira resembled her Blood Demon Art that was showcased during the fight against Uzui.
His training also made him extremely pain tolerant and poison resistant, which saved him from Gyutaro's poison and allowed him to fight despite suffering numerous injuries and losing his hand.
Nezuko's inability to speak is one of her character defining traits. However, one theory suggests a deeper meaning behind the silence. Nezuko is one of Demon Slayer's most popular characters, adored by fans for her cuteness. However, despite being so renowned, Nezuko rarely ever speaks.
In conclusion, Nezuko cannot beat Akaza in Demon Slayer. In terms of power, physical abilities, regeneration rate and overall combat ability, Akaza is far superior compared to Nezuko.
Is Nezuko cured in Demon Slayer? Fortunately, Demon Slayer fans who have read the manga know that Tamayo's medicines cure Nezuko towards the end of the series.
Unlike other demons who survive on blood, Nezuko never really needs it, and she doesn't even consume human food either. Moreover, Nezuko has never shown any signs of undernourishment as she is always ready to assist her brother with her overwhelming strength and deadly Blood Demon Art.
Nezuko Kamado is one of the youngest characters in Demon Slayer as she is only 12 years old at the start of the story when she is turned into a demon.
Nezuko is easily one of the most powerful demons in the Demon Slayer series, possibly due to the large quantity of blood she was given by Muzan. But what makes her a truly terrifying opponent is her willpower, being the only other demon after Tamayo to escape Muzan's control.
While stuck physically at age 12 because of the whole demon thing, Nezuko is 14 chronologically.
Fun fact: The reason why Enmu was able to say Muzan's name out loud without dying is because they're married!
It is revealed that Muzan's true fear of dying and immense desire to live and survive was due to him being born "dead," where his heart would constantly stop in his mother's womb and was assumed stillborn until he fought to breathe before his cremation.
Muzan injects Tanjiro with all of his blood, turning him into a demon.
Tanjiro and Nezuko Kamado's lives were forever changed when Muzan Kibutsuji, the King of Demons, slaughtered their family and left Nezuko to become a demon.
The warrior Muzan feared was a swordsman named Yoriichi Tsugikuni. Yoriichi was the only slayer before Tanjiro who came close to killing Muzan, and the flashback of their fight occurred in Chapter 187.
However, frightening as Kibutsuji's blood curse is, it isn't infallible. There are at least two demons in Demon Slayer who have managed to overcome the curse through sheer willpower: Tamayo and Nezuko.