Kokoro has waist-length pale pink hair, and blank eyes of the same colour. She wears a blue plaid blouse, adorned with buttons of various shapes (from top: red star, yellow circle, green triangle, and purple X). Her salmon-coloured skirt is pumpkin-shaped, and lined with holes in the shape of alternating smiling and frowning faces (both are the same pattern, flipped vertically). She always wears one of her 66 masks over of her face in order to display her emotions.