Gyokko is a major antagonist in the anime series Kimetsu no Yaiba (Demon Slayer). He is one of the Twelve Kizuki, holding the position of Upper Rank Five among Muzan Kibutsuji's elite demons. Gyokko is known for his grotesque, vase-like appearance and his obsession with creating morbid 'art' from human bodies. He possesses powerful Blood Demon Arts related to water and vases, making him a formidable opponent. Gyokko's twisted personality and loyalty to Muzan make him a significant threat to the Demon Slayer Corps.