Nezuko is a fictional character from the popular anime and manga series Demon Slayer: Kimetsu no Yaiba. She is the younger sister of the main protagonist, Tanjiro Kamado. After a demon attack that kills their family, Nezuko is transformed into a demon herself but retains her human emotions and protective instincts towards her brother. Despite her demon form, Nezuko fights alongside Tanjiro to defeat other demons and find a cure for her condition. She has unique abilities, including enhanced strength and the power to manipulate her size. Nezuko is known for her distinctive appearance, featuring long black hair and a bamboo muzzle to prevent her from biting humans.