Since becoming a demon, Nezuko appears to have become rather brazen, and does not seem to fear fighting; she fiercely guards her brother, Tanjiro, as well as her allies. She has also developed a strong willpower, which can be seen through her refusal to consume human flesh or blood, even in cases of extreme. Her strong willpower remains even when human later on as well. She does not hesitate to protect her brother even if it means putting herself in danger Mute because of the muzzle