The most unique demon in all of Demon Slayer: Kimetsu no Yaiba, Nezuko Kamado never fails to surprise. The only demon in the series to not consume human flesh, Nezuko is proof that demons aren’t necessarily evil – or at least she was. After her Berserker form appeared, Nezuko almost crossed the line on which her existence depends by attacking a human. If Nezuko is sensitive to humans’ urge to eat, could she be vulnerable to Muzan Kibutsuji’s influence? After all, the demon spawner could use a new Upper Moon after Akaza let him down and Daki turned out to be ridiculously weak.
Seeing Tanjiro so heavily injured after his fight against Daki, Nezuko was forced to remember the massacre that claimed her family’s lives and turned them into demons. Driven by an all-consuming rage, Nezuko transformed into an adult with vine tattoos on her body and a jagged horn on her head. In this state, called Berserker form, she easily overpowered Daki, who has the rank of Upper Moon Six (a title she shares with her brother). Nezuko’s raw power is undeniable: she tore Daki to pieces before burning her almost beyond repair with her blood demon art, pyrokinesis.
Earlier in the “Entertainment District” arc, Muzan had Daki find and eliminate Nezuko as she had escaped his control. However, now that Kibutsuji knows how powerful Nezuko is – as Muzan knows everything his demons know – he might decide that Nezuko could be of great use to him. Nezuko is at least stronger than Daki, which means that if Muzan could bring her back under his control, she could certainly lay claim to the most prestigious title a demon could hold: member of the Twelve Kizuki. Thanks to Nezuko’s remarkable strength, she should be an Upper Moon.
Admittedly, Nezuko’s blood demon art isn’t very useful in this scenario, as it only harms other demons, and Muzan would prefer them to prey on humans, not each other. to others. No one really knows what Muzan is capable of, but altering a Demon’s Blood Demon Art shouldn’t be beyond his reach. Nezuko’s pyrokinesis aside, her vicious claws slice through flesh like butter, and her powerful kicks can even obliterate an Upper Moon, so she’s far from harmless.
Nezuko’s most notable new ability is that she can solidify her blood to piece her dismembered body back together, perhaps even to the point of being able to survive a decapitation. A demon can only die from decapitation if done with a Nichirin blade, but as Daki showed when she survived Tengen Uzui’s killing blow, there are ways for a demon to survive even that. It’s unknown if Nezuko would have survived being beheaded with a Nichirin blade rather than Daki’s belt, but if Daki can do it, so can Nezuko. Additionally, Nezuko can still control her dismembered body when bound by congealed blood, meaning she wouldn’t even be vulnerable to a second blow after a successful decapitation.
It’s clear that Nezuko isn’t herself when she’s in this berserker state, and if she’s vulnerable to demonic bloodlust, she’s at risk of being under Muzan’s control. Demon Slayer needs a new plot once the “Entertainment District” arc is over, given that it’s the second consecutive arc in which Tanjiro and the others must rely on a Hashira to save the day from a Upper Moon. With the series about to wind down, having Nezuko fall under Muzan’s control would be the perfect way to shake things up in a personal way for our heroes.