In case you're wondering, yes, Aqua is related to Mist. She is Mist Elmbarn's mother. She was a former Valkyrie who worked for Freyr and Freyja of Folksvangr. Then, she fell from grace and was banished to the netherworld for a crime she was framed for by another deity. There, after being discovered and nursed back to health by benevolent harpies, Aqua started her life anew.