A Pure type 1st year, Aya is shy and scared, but wants to overcome her fears. She really loves calligraphy.
In M's songs, Aya will most likely take the role of Hanayo, and in Aqours, she will usually be Ruby, though this is subject to singer preference on a song-by-song basis. This does not mean she needs to sound like either, only that she is likely to sing those lines.