Aya is shown as a very young child, possibly between the ages of 4 to 7. She has light colored hair, lightest of her siblings, styled into two upward pigtails. She is usually shown with a dress with a white collar and a dark colored ribbon. Out of all of the siblings she is always known as the shortest, hinting at her being the youngest sibling in the family.
Due to how little appearance Aya makes, not much is known on her personality. She is shown to be a bright and energetic little girl, seen playing with her brother Kei.
Currently Aya does not appear in any fan-works on this wikia.