Aoi is a 16 year old young girl of average height, with deep blue eyes that fade to a lighter blue at the bottom, along with white rectangular pupils, straight black hair with a parted fringe, and twin-tails. She wears two blue butterfly clips to keep her twin-tails in place. She wears the standard Demon Slayer uniform with the addition of a white nurse dress on top of it, with a blue sash around her waist. Her uniform is tinted slightly blue. She is often seen with a frown on her face.