Gyokko (玉ぎょ壺っこ Gyokko), along with Hantengu, was one of the primary antagonists in the Swordsmith Village Arc of Demon Slayer: Kimetsu no Yaiba. He was a demon affiliated with the Twelve Kizuki, holding the position of Upper Rank Five (上じょう弦げんの伍ご Jōgen no Go). Before becoming a demon, he was a human by the name of Managi (益ま魚な儀ぎ Managi).