The only upper moon that Nezuko can defeat is Daki, it was shown that she was indeed stronger. However, she doesn't stand a chance against the other upper moons.
Nezuko becomes much stronger throughout Demon Slayer. She's stronger or even as strong as an upper moon.
Although Gyutaro might be far stronger, Nezuko would only have to keep up against the demon until sunrise. Her Blood Demon Art is such that it only affects demons, which means there is a very good possibility for her to beat the Upper Moon 6 demons.
Nezuko can be ranked at the level of an Upper Moon 5 since she is considerably weaker than the likes of Kokushibo and Doma.
Kokushibo was the final Upper-Rank to die during Demon Slayer's "Infinity Castle" arc. Muichiro, Genya, Sanemi Shinazugawa and Gyomei Himejima fought together against Kokushibo, though Muichiro and Genya were no match for him and were killed.
Is upper rank one Tanjiro's father? No, they are not related. Tanjiro, by PURE COINCIDENCE, heavily resembles Yoriichi Tsugikuni, the creator of Breath swordsmanship, the only other person to use Sun Breathing, and the only person Muzan ever feared.
Kanao only succeeded in decapitating the Upper Rank when Inosuke used his swords to push her blade through Doma's neck.
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.
Muzan, the King of Demons, is the strongest and also the primal demon in the world of Demon Slayer. Consuming his blood is enough to turn you into a powerful demon. He can control all the demons in existence, with only people with strong willpower like Nezuko being an exception.
Nezuko's most significant trait, however, is her immense growth, which is likely due to a combination of the amount of blood she received from Muzan and her willpower. To conclude, Nezuko is a formidable powerhouse within the anime and is probably one of the strongest main characters in the series.
So if Nezuko ate a human. and continued to do so over time, her power could rival that of Upper Moon one or 2, and here's why. One, if you're a manga reader, you know, in her base, Nezuko conquers the sun. And 2, her blood demon art can nullify.
Weaknesses: Wisteria flowers are poisonous to her. Exposure to sunlight used to be lethal, but no longer affects her. Notable Attacks/Techniques: Blood Demon Art: Blood Burst: Nezuko ignites her blood and turns them into flames that only burn demons and their blood demon arts.
Since Nezuko isn't a part of the Twelve Kizuki, she doesn't get a demon rank. She does however have her own demon blood art, as well super-fast reflexes and the ability to grow and shrink in size.
I think Nezuko is in between upper moon level and lower moon level. She was able to fight against a full powered daki and was beating her for a while. Nezukos regeneration speed surpassed Daki as well so she has the regenerative powers of an upper moon.
Nezuko's Sunlight Immunity in Demon Slayer is Tied to the Blue Spider Lily. Nezuko having eaten the Blue Spider Lily at some point could explain her immunity to sunlight, and Demon Slayer: Kimetsu no Yaiba has already worked to justify that.
Giyu is one of the legendary Hashira, and he's brought down demons far more powerful than Nezuko. With his level of skill and impressive agility, he'd easily defeat Tanjiro's little sister. In fact, when Giyu first meets Tanjiro and Nezuko, he almost does kill the latter.
In his first appearance, the Wind Hashira Sanemi Shinazugawa discovered Nezuko Kamado and tried to agitate her by stabbing her repeatedly. When that didn't work, he cut his arm in an attempt to get her to bite him and prove she was no different than any other demon, ignoring Tanjiro's pleas for him to stop.
If Zenitsu fought Akaza with his plethora of Thunder Breathing techniques, the latter wouldn't have the time to regenerate his limbs.
Nezuko, also a part of our strongest characters in the Demon Slayer list, is one of the most powerful female characters in the anime. Just by being a demon, she is more powerful than all the human characters in the series. And she is also the only demon who can withstand the sun, making her practically unkillable.
Conclusion. 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.
1 Mitsuri Kanroji
When Mitsuri was fighting Muzan Kibutsuji, she grabbed one of his appendages and tore it off with her own hands, demonstrating her incredible strength and dexterity. Mitsuri has a strange connection with her renown for strength while being secure in her talents as a powerful Hashira.
While there were numerous remarkable moments in episode 9, one scene, in particular, captured the collective attention of fans worldwide, the beheading of Gyokko. In a stunning display of precision, the head of the formidable Upper Moon 5 Demon is cleanly severed, and his body swiftly turns to ashes.
It has been said that no one has been able to kill an Upper Moon in a hundred years, since Upper Moon Six Daki and Gyutaro were killed. ”The demons with Muzan's thick blood coursing through them are demons that have gained a massive amount of strength from Muzan himself.”
In a nutshell, Muzan, being the progenitor of demons, is not scared of Doma. However, he is irritated by his inability to decipher Doma's thoughts and feelings, which is the ultimate control he has over all of his creations. Upper-Rank Two: Doma is a nihilistic maniac and a misanthropic cold-blooded demon.