Aster Ax is the daughter of the famous scholar Magus Ax. She is associated with the Almanax, which is written by her father and herself. In her own words:
I'm an expert in meteorology, the tides and lunar cycles. I'm also a grammar teacher, which means I'm the one who rereads my father's notes and puts them in order for the Almanax, the most advanced calendar in our universe.
— Almanax