·       Violet Sorrengail: The protagonist of the novel, a petite 20-year-old first-year Basgiath War College student with Ehlers-Danlos syndrome, determined to prove her strength. She is a kind and compassionate woman who is determined to succeed in spite of her disability. She is also a bit of a loner who is not afraid to stand up for what she believes in.

·       Xaden Riorson: The wingleader of Fourth Wing and Violet's rival, a third-year student with a mysterious past. He is a charismatic and ambitious man who is determined to win at all costs. He is also a bit of a bully who is not afraid to use his power to get what he wants.

·       Dain: Violet's best friend and roommate, a third-year student who is always willing to help Violet out. He is a kind and compassionate man who is determined to help Violet succeed. He is also a bit of a joker who is always up for a good time.

·       Liam Mairi: A first-year student who is Violet's friend and ally, a talented warrior who is determined to prove himself. He is a kind and compassionate man who is determined to help Violet succeed. He is also a bit of a loner who is not afraid to speak his mind.

·       Mira Sorrengail: Violet's older sister, a second-year student who is determined to protect Violet. She is a kind and compassionate woman who is determined to help Violet succeed. She is also a bit of a mother hen who is always looking out for Violet.

·       Reaghan Mathias: A first-year student who is Violet's friend and ally, a talented archer who is determined to prove herself. She is a kind and compassionate woman who is determined to help Violet succeed. She is also a bit of a tomboy who is not afraid to get her hands dirty.