- Erasmas (nickname "Raz"): The protagonist of Anathem; a Decenarian fraa from the Concent of Saunt Edhar. The neglected son of slines, he was collected by the concent at the age of eight.
- Orolo: A Decenarian fraa from the Concent of Saunt Edhar. He is an eminent cosmographer and Erasmas's mentor at the concent. He is banished for using forbidden technology to observe the alien ship in violation of the Discipline's isolation requirements. He dies while recovering the alien body from Orithena, and is canonized as a Saunt for his sacrifice.
- Arsibalt: A Decenarian fraa from the Concent of Saunt Edhar and one of Erasmas's friends. The estranged son of a religious official, he seeks to reconcile religion with theorics.
- Lio: A Decenarian fraa from the Concent of Saunt Edhar and one of Erasmas's friends. He's known as an absent-minded eccentric and is interested in military history, Vale-lore (martial arts), and unusual gardening techniques. He leads the space mission to destroy the alien weapon.
- Jesry: A Decenarian fraa from the Concent of Saunt Edhar and one of Erasmas's friends. Unlike Erasmas, Jesry comes from a prosperous family, and is bored with the routine of mathic life preceding the arrival of the aliens. He becomes famous for going into space with the Warden of Heaven (a religious leader of the Sæcular Power) to investigate the alien ship.
- Ala: A Decenarian suur from the Concent of Saunt Edhar. She becomes a major organizer of the Convox, and later, the Arbran resistance. Although they disliked each other as children, she and Erasmas become romantically involved in the course of the story.
- Jad: A Millenarian fraa from the Concent of Saunt Edhar. Jad is summoned to the Convox at the same time of Erasmas, but tells Erasmas to look for Orolo instead of traveling directly to the Convox. Jad is a participant in philosophical discussions at the Convox and plays a key role in the mission to the alien ship. It is hinted that he is hundreds of years old and possesses the ability to be conscious within multiple parallel universes.
- Cord: Erasmas' half-sister and a machinesmith who lives near the Concent of Saunt Edhar. She accompanies Erasmas on his search for Orolo. She and Yul become romantically involved in the course of the story.
- Sammann: A member of a social caste of computer experts from the Concent of Saunt Edhar who accompanies Erasmas on his search for Orolo. He provides technological support and knowledge for Erasmas' companions throughout the story.
- Yulassetar Crade (nickname "Yul"): A wilderness guide who joins the expedition to find Orolo. He and Cord become romantically involved in the course of the story.
- Ganelial Crade (nickname "Gnel"): A religious man who volunteers to drive the avout to the Convox, before joining the search for Orolo. Erasmas mistrusts Gnel at first, but becomes friends over the course of the story.
- Jules Verne Durand: A linguist from Laterre who infiltrates the Convox to gather information for the aliens. He defects to the Arbrans and joins the mission to the alien ship.
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