Asa is an average-height high school girl with brown eyes that can appear brighter in certain situations. Her black hair, sometimes tinged with a purple hue, falls to the middle of her back and is styled in low twin tails. She typically wears her school's female uniform, consisting of a button-up shirt, a pinafore-style dress with a pleated skirt, a bow at the collar, a wide belt at the waist, knee-high black socks, and sneakers.