Nezuko is a strong-willed, joyful, and emotional young girl whose appearance is a demon, yet her willpower to protect humans no matter what is her most basic instinct. She has a green, bamboo muzzle just in case things go wrong, also definitely for safety. Nezuko is Tanjiro's little sister, and also holds the Blood Demon Art of her own blood, turning it into fire. Nezuko can shrink in size, or grow anytime she'd like. She mostly stays at her small, medium size.