She has a short, small figure with long grayish purple hair pinned up at the back with a black or purple bow with side braids and brown eyes. At the beginning of the series, she is shown wearing her school uniform, a gray with light blue design sailor fuku. However, after Yūichirō was accepted into the Moon Demon Company, Shinoa is often seen wearing her JIDA uniform which consists of a long-sleeved black coat with two rows of gold buttons on the front, light green trims around both of her cuffs and shoulder epaulettes, which has a fourragère that passing under and around her side, an armband on her left arm, a standing collar that has a bow tie around it and a white web belt with a gold waist-plate. As well as a pair of white gloves, black skirt, dark gray pantyhose and knee-high black boots. Her casual appearance doesn't differentiate much from her JIDA uniform. The minor differences is she doesn't have her gloves along with the bow tie on her collar and wears a white long-sleeved dress shirt with a camisole over it instead.
In chapter 8, Shinoa tells Yūichirō, she is still growing because her elder sister turned out to be a very beautiful and very busty woman.