Fan Casting Mona Megistus in Mondstadt: The City of Wind and Song

A mysterious young astrologer who proclaims herself to be "Astrologist Mona Megistus," and who possesses abilities to match the title. Erudite, but prideful. Though she is often strapped for cash and lives a life of thrift, she is resolved to never use astrology for profit... It is this very resolution that has caused her to constantly fret about money.