Gyokko

Age: >113 (Chronologically)
Height: 150 cm (4'11") (Normal), 170 cm (5'7") (Molted)
Weight: 40 kg (88 lbs) (Normal), 80 kg (176 lbs) (Molted)
Affiliation: Twelve Kizuki

Gyokko, along with Hantengu, one of the primary antagonist in the Swordsmith Village Arc of Demon Slayer. He is a demon affiliated with the Twelve Kizuki, holding the position of Upper Rank Five.

Before becoming a demon, he was a human by the name of Managi.