Aelin is the 19-year-old demi-Fae queen of Terrasen, formerly known as the assassin Celaena Sardothien. She wields immense fire magic inherited from her ancestors, specifically the goddess Mala Fire-Bringer. She carries the heavy burden of leadership and feels deeply responsible for protecting her people from the Valg armies. Aelin operates with calculated strategy, often keeping her complex military plans secret even from her closest allies.

Rowan is a centuries-old full-blooded Fae warrior who left his position in Queen Maeve's cadre to serve Aelin. He wields powerful wind and ice magic, which complements Aelin's fire in combat. Highly lethal and deeply devoted, he acts as Aelin's protector, confidant, and equal in battle. He carries heavy physical and emotional scars from his long, violent life under Maeve's command.

Dorian is the young king of Adarlan, recovering from the traumatic aftermath of demonic possession. He struggles to control his raw magic, which includes ice, fire, and invisible phantom hands. Haunted by the gruesome murder of his lover, Sorscha, he works to become a capable ruler and forge military alliances to fight off the looming Valg threat.

Manon is an Ironteeth witch and the Wing Leader of the Blackbeak clan. She commands Erawan's aerial legion from the back of her wyvern, Abraxos. Raised to be a ruthless killer by her cruel grandmother, she begins to question the brutal methods and blind loyalties expected of her people. Her growing compassion puts her at odds with witch traditions.

Elide is a young human woman from Perranth with latent witch heritage. She escaped prolonged enslavement in the dark fortress of Morath, where her uncle kept her chained. She walks with a severe limp due to childhood injuries but possesses sharp survival instincts. She travels on a desperate mission to deliver a mysterious black stone to Celaena Sardothien.

Lorcan is a powerful demi-Fae warrior bound by a blood oath to Queen Maeve. He draws his destructive magic from the death god Hellas. Operating independently in Erilea, he tracks dangerous magical artifacts on his queen's behalf. His ruthless nature is challenged when he intersects with Elide and decides to travel with her.

Aedion is a famed general known as the Wolf of the North and Aelin's cousin. He leads the Terrasen army and works tirelessly to orchestrate political meetings to secure Aelin's rightful place on the throne. As a military strategist, he frequently clashes with Aelin over her tendency to withhold battle plans from him.

Erawan is an ancient Valg king who commands dark forces and parasitic demons. Operating from his ruined fortress of Morath, he seeks to conquer the continent and plunge the world into darkness using magical portals. He is ruthless, wielding near-godlike power and relishing the psychological torment of his enemies.

Maeve is the ancient and manipulative Fae queen of Doranelle. She commands a lethal cadre of elite warriors through unbreakable blood oaths. Operating with a hidden agenda regarding the Wyrdkeys, she strikes at Aelin's forces to secure her own power, caring little for the casualties she causes along the way.

Lysandra is a skilled shapeshifter and close friend to Aelin. She can transform into various beasts, including a ghost leopard and a massive sea dragon, using these forms to scout enemy territory and defend her companions. She carries the emotional weight of a traumatic past but finds strength in her new family.

Gavriel is an elite Fae warrior, known as the Lion, sworn by blood oath to Queen Maeve. He travels across the continent alongside Fenrys with orders to track down his rogue comrade Lorcan. Unlike some of his peers, he does not openly hate his bond to Maeve but regrets the choices it forces him to make.

Fenrys is a skilled Fae warrior forced to serve Maeve to protect his twin brother, Connall. He travels with Gavriel on a mission to hunt down Lorcan. He deeply resents his blood oath and the degrading commands of his sovereign, frequently looking for loopholes in Maeve's orders to assist Aelin's cause.

Rolfe is the pirate lord who controls Skull's Bay. He possesses a magical map tattooed onto his hands, obtained through a dark bargain in his youth. He resists outside efforts to drag his pirate fleet into the continental war, preferring to keep his people out of Erawan's sight.

The Blackbeak Matron is the ruthless grandmother of Manon. She rules her witch clan with violence and strict adherence to Ironteeth traditions. She punishes any sign of weakness or disobedience, valuing war and bloodshed over familial affection.

Asterin is a fierce witch warrior and Manon's second-in-command within the Thirteen. She is unshakeably loyal to her Wing Leader. She bears heavy physical and emotional scars from punishments inflicted by the clan elders regarding her past.

Vernon is Elide's uncle. He usurped control of the Perranth territory and aligned himself with Erawan's dark forces to improve his social standing. He imprisoned his niece in Morath, viewing her as a tool for sinister magical breeding experiments.

Elena is an ancient princess of Terrasen and Aelin's ancestor. She appears as a spirit to guide Aelin toward ancient relics needed to seal the demonic portals. Her past actions concerning the Valg King shape the current conflict.

Abraxos is Manon's massive wyvern mount. He fights alongside her in Erawan's aerial legion and displays surprising intelligence and loyalty. He repeatedly saves Manon's life during dangerous encounters.