Age: <20 (Human), ≈1,000 (Chronologically), >10,000 (Biologically) Height: 179 cm (5'10½") Weight: 75 kg (165 lbs) Affiliation: Twelve Kizuki (Leader) Kibutsuji Muzan is a Demon, the first of his kind, and the progenitor of most other Demons. (Source: Kimetsu no Yaiba Wiki)