Asa is a high school girl of average height and build. She has brown eyes that are usually pitch dark, though the irises become much brighter in some situations. Her hair is black and is sometimes colored with a purple tint. The hair reaches the middle of her back, and she wears it in two low twin tails, making it appear shorter. In the past, Asa wore her hair at shoulder length. She wears her school's female uniform which consists of a long-sleeved button up shirt worn beneath a pinafore style.