Main characters •
Violet Sorrengail: The protagonist and primary point-of-view character. Smaller and physically weaker than the other riders, she only joins the Riders Quadrant at the demand of her mother, General Lilith Sorrengail. She is assigned to Fourth Wing. In an unprecedented turn of events, she bonds to two dragons, Tairneanach, or "Tairn", a black, morningstartail, behemoth of a dragon, and Andarnaurram, or "Andarna", a golden, feathertail dragon. •
Xaden Riorson: A marked one, and wing leader of Fourth Wing who, through his bond with his dragon Sgaeyl, has the ability to wield shadows. He is the son of Fen Riorson, a rebellion leader who killed Violet's brother and was later killed by Violet's mother. Because of this, Xaden and Violet are incredibly hostile towards one another. Xaden is described as an extremely attractive person and is a love interest for Violet. Bonded to Sgaeyl, a navy-blue, daggertail dragon. •
Dain Aetos: Violet's childhood best friend and son of Colonel Aetos. A second-year Rider, he is a squad leader in the Fourth Wing. Through his bond with his dragon Cath, he can read memories upon touching another person. He is a love interest for Violet. Bonded to Cath, a red swordtail; signet:
retrocognition. •
Rhiannon Matthias: A first-year member of the Riders Quadrant who is assigned to Fourth Wing. She becomes Violet's best friend. Bonded to Feirge, a green, daggertail; signet: retrieval. •
Sawyer Henrick: A repeated first year, he and Rhiannon agree to help Violet with hand-to-hand combat if Violet tutors them in history. He becomes a good friend of Violet, Rhiannon, and Ridoc. Bonded to Sliseag, a red, swordtail dragon; signet: metallurgy. •
Ridoc Gamlyn: A first-year member of the Riders Quadrant who is assigned to Fourth Wing. He is very humorous and becomes a good friend of Violet, Rhiannon, and Sawyer. Bonded to Aotrom, a brown swordtail; signet: ice-wielding. •
Liam Mairi: A first-year Rider who grew up with Xaden after their parents were killed for leading the rebellion. Bonded to Deigh, a red daggertail; signet: farsight.
Other Basgiath War College students •
Jack Barlowe: A violent first-year Rider who is assigned to First Wing and makes it his mission to kill Violet. •
Jesinia Neilwart: a first-year in the Scribe Quadrant and Violet's friend. •
Oren Seifert: a jealous first-year Rider who is assigned to First Wing and like Jack makes it his mission to kill Violet. •
Amber Mavis: a wing leader and a close friend of Dain.
Notable Navarre military officials •
Lilith Sorrengail: She is the Commanding General of Basgiath War College. Her signet is Storm Wielding, and she is bound to the Brown Dragon Aimsir. Lilith is known as a ruthless, stern, and powerful rider, which makes her respected and feared by those within and outside the Kingdom of Navarre. Lilith is also Asher Sorrengail's wife and Violet Sorrengail's mother. In addition, Lilith plays an important role in the life of Xaden Riorson, as she is responsible for the death of Fen Riorson. •
Mira Sorrengail: Violet's older sister and a graduate of Basgiath War College. She strongly opposes her mother's decision to force Violet into the Riders Quadrant. Bonded with Teine, a green, clubtail dragon; signet: ward extension. •
Augustine Melgren: General of all of Navarre's armies. His bonded black swordtail dragon, Codagh, gave rebellion relics to all of the rebels' children, or "the marked ones", offering some protection to them from Melgren's signet. Melgren is able to see the outcome of any battle, except when three or more marked ones are gathered. •
Colonel Aetos: Dain's father. Dragon and signet are unknown.
Additional notable characters •
Brennan Sorrengail: Violet's brother. Signet: mending. Bonded to an orange daggertail dragon named Marbh. •
Asher Sorrengail: Violet's father •
Fen Riorson: Xaden's father, Fen, was an infantryman and leader of the Tyrrish rebellion against the government of Navarre. Fen was a man of values who wanted Xaden to follow his footsteps. As a result of his actions against the government, as well as the death of Brennan Sorrengail, Fen Riorson was sentenced to death, with Lilith Sorrengail in charge of carrying out the execution. •
Imogen Cardulo: A second-year rider at Basgiath War College as a supportive friend to Xaden and a potential ally for Violet. •
Garrick Tavis: Xaden's best friend since childhood, Garrick is characterized by his loyalty and steadfast nature. •
Professor Carr: A knowledgeable instructor at Basgiath War College. ==Reception==