Hylla is a strong and brave young woman. She loves and cares about her younger sister, Reyna. She wanted to protect Reyna, so they went to Circe's island hoping to keep her safe. She is also somewhat vengeful, and was still furious with Percy for destroying Circe's Spa, her past home, even after meeting him four years later, though she later abandoned this grudge and even agreed with his points about cooperating with Greek demigods. Like her fellow Amazons, Hylla denies the idea that members of the organisation were opposed to the existence of males and found such an idea laughable. Rather, she voiced the opinion that men just needed to be shown who was in charge.