Gyokko is a major antagonist in Kimetsu no Yaiba, serving as the Upper Rank Five of the Twelve Kizuki under Muzan Kibutsuji. He is a grotesque demon obsessed with art, beauty, and creating twisted “masterpieces” from human bodies. Arrogant and sadistic, Gyokko attacks the Swordsmith Village and plays a key role in one of the series’ major arcs. His fight against Muichiro Tokito reveals both his cruel nature and his deadly blood demon art.