Sayu is said to be pint-sized. She has short beige hair and reddish eyes. She wears a hoodie and a tail, that is styled after a mujina. She wears a short kimono with short sleeves and a black sash wrapped around her waist. She has a pair of fingerless gloves, with one going past her elbow and the other ending at her forearm, along with a pair of handguards. She always keeps her hood up, which has mujina ears and a leaf resting between them. She additionally wears sandals.