Kamado — Nezuko

: She can freely change her physical size, often shrinking to fit into the wooden box Tanjiro carries or enlarging to gain more power in combat.

: Nezuko famously wears a bamboo muzzle to prevent her from biting humans, though her willpower eventually allows her to suppress her demonic hunger entirely through sleep. Kamado Nezuko

Nezuko's appearance shifts significantly as she grows in power: : She can freely change her physical size,