Note: Manga only
A DearS visiting from another town. She seems to speak with a Kansai dialect, meaning she might be homestaying in a town near Osaka. She also forms a friendship with Natsuki right off the bat, even helping her sell takoyaki at the Koharu Summer Festival. She stays on earth when the option is presented.
Aya has short blue-violet hair and dark green eyes; her hair is noticably less detailed and less decorated when compared to other DearS, and she also has darker skin. Unlike most of the other DearS in the series, Aya's standard uniform isn't given much detail or even mentioned/shown.