The particular color of her hair would also be reminiscent of her family's history as Children of Fire, explaining the burnt red tinge at the ends of her hair. This implies that Nezuko's hair color represents the demon blood within her; as the color takes over her hair, she may succumb to her demon side more often.
Her hair is long, black, and wavy. It reaches just below her waist, turning a flame-orange color as it passes her elbows, and appears to be crimped into large, straight ridges, worn side-swept drastically to her left.
However, she wasn't immune to the sunlight initially, as she got burned badly at first. 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.
Pyrokinesis: Nezuko's Blood Demon Art allows her to generate and manipulate special demonic flames created from her blood that are pinkish in color. Nezuko can do this by igniting her blood or creating it from thin air.
In episode 6 of Demon Slayer season 2, Nezuko entered a berserk state to protect her brother Tanjiro, causing her body to develop into that of an adult. She loses her gag, grows a single horn and gains vine-like patterns across her body.
While she might not be as powerful as Muzan himself, her overall strength makes her easily comparable to an Upper rank demon.
Due to her demon abilities, Nezuko can change her size/age and appear “mature” in a slightly older form or can even make herself look younger and smaller than a 12-year-old. Anime is weird and demon stuff only makes it weirder.
1 Exploding Blood/Pyrokinesis Blood Demon Art
By far, this is Nezuko's most damaging technique when it comes to fighting her own kind.
With this in mind, if Nezuko had also been murdered by Muzan, Tanjiro would have no reason to be empathetic toward demons. Her transformation gave him a perspective of both demons and humans, but without Nezuko becoming a demon he would have no reason to take their feelings into account.
The now-iconic bamboo muzzle serves as a way of stopping Nezuko from using her teeth, and also keeps her from tasting human blood, which would cause her to lose control of herself.
"Humans are to be protected and saved... I will never hurt them." - Nezuko Kamado.
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 might be a terrifying demon, but she's also one of the cutest characters in anime.
Demon Slayer: Why Nezuko Wears a Bamboo Muzzle. Nezuko is Demon Slayer's pacifist Demon, partially due to the bamboo muzzle curbing her bloodlust.
According to the Demon Slayer manga (which would be the “bible” of the anime series), the blade is made out of scarlet crimson iron sand and scarlet crimson ore, which are collected from the mountains.
Eventually Zenitsu and Nezuko would marry and start a family as evidenced by their descendants.
ZenNezu is the het ship between Zenitsu Agatsuma and Nezuko Kamado from the Demon Slayer fandom.
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.
Nezuko's Strength
Despite being a demon, Nezuko has found several ways to circumvent the negative consequences of her condition. Her strong willpower is easily her greatest trait, as with it she was able to resist the urge to feed on blood and instead regains her strength through extended sleep.
Muzan had attacked Tanjiro's family and shared his blood with Nezuko.
However, during the second season of Demon Slayer, she underwent a transformation and developed a horn, and her body resembled that of a grown adult. This seems to be her awakened mode and could be her true demonic form.
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.
So, Nezuko's size can change either way to reflect her emotional state and instinctual needs,. Her size-changing isn't merely a visual gag or a fun party trick. It's an insight into what this demon girl truly feels in her heart, for good or ill.