Fourth Wing introduces a wide range of characters, many of whom become important players in The Empyrean series, and one can determine which of Rebecca Yarros’ characters they’re most similar to by looking at their zodiac sign. Each of the 12 zodiac signs is associated with its own traits, which include a variety of strengths and weaknesses. Violet Sorrengail and the people she comes into contact with at Basgiath War College all have their share of both.
https://screenrant.com/fourth-wing-character-based-zodiac-sign-astrology/