Nakime

Nakime is a demon in Demon Slayer: Kimetsu no Yaiba (Kimetsu no Yaiba), often called the Biwa Demon. She serves directly under Muzan Kibutsuji and controls the Infinity Castle, the ever-shifting, extra-dimensional fortress that serves as a base for Muzan and the Upper Moons.

She is a stoic, emotionless, and highly loyal figure who speaks very little and only when necessary. Her main ability comes from her Blood Demon Art, which lets her manipulate the entire structure of the Infinity Castle by playing her biwa — instantly shifting rooms, creating portals, teleporting people, and disorienting opponents to trap or separate them.

She initially appears as a mysterious summoner for demon meetings, but later becomes Upper Rank Four (Jōgen no Shi) in the Twelve Kizuki after Hantengu's defeat.