Astraea has long walnut brown hair that is gathered together behind her head in a dignified manner, along with deep indigo eyes that are reminiscent of a sea of stars. She wears a simple kirtle and a long skirt.

Astraea is kind and calm. She usually maintains a peaceful expression and has never behaved aggressively towards others. Even when Ryuu exploded at her and berated her for her own problems, attributing the cause of it to mistakes made by her and the rest of the Gods, Astraea remained composed as she simply accepted all of her words.