Howard Roark The hero of the story. It is his struggle to succeed as an architect on his own terms that forms the essence of the novel's conflict. His independent functioning serves as a standard by which to judge the other characters — either they are like Roark or they allow others, in one form or another, to control their lives. Roark is the embodiment of the great innovative thinkers who have carried mankind forward but are often opposed by their societies.
Henry Cameron Roark's mentor. He is an aged, bitter curmudgeon — and a commercial failure — but he is the greatest architect of his day. He is an early modernist, one of the first to design skyscrapers and a man of unbending integrity. Roark admires Cameron as he does no one else in the novel. His life exemplifies the fate of many innovators who have discovered new knowledge or invented a revolutionary product, only to be repudiated by society.
Dominique Francon An impassioned idealist who loves only man the hero. Dominique is Roark's lover, his greatest admirer, and, simultaneously, an ally of Roark's most implacable enemy — Ellsworth Toohey — in the attempt to ruin his career. Dominique, though a brilliant woman, holds a pessimistic philosophy throughout much of the novel that prevents her from fulfilling her vast potential.
Guy Francon Dominique's father. A phony architect, who achieves commercial success by two means: copying from the great classical designers, and wining and dining prospective clients with urbane wit and charm. His great financial success despite his unprincipled methods provides some of the evidence on which Dominique originally bases her conclusion that the world is essentially corrupt. Francon's tutelage helps Peter Keating develop into an even more unscrupulous manipulator than his boss.
Peter Keating The foil to Roark. He lacks the backbone to ever stand alone, and spends his life forever seeking the approval of others. He even codifies his toadying attitude into a formal principle: "Always be what people want you to be." Keating is an outstanding example of a status-seeking conformist.
Mrs. Louisa Keating Peter's mother. She seeks respectability above all. She teaches her son to put the values of others before his own. By encouraging her son to surrender his mind to others, she is indirectly responsible for causing his ultimate self-destruction.
Ellsworth Toohey Architectural critic and spiritual power broker. Toohey is simultaneously a cult leader acquiring a private army of slavish followers and a Marxist intellectual preaching socialism to the masses. Roark's refusal to obey threatens his hegemony in his own field, so he dedicates himself to Roark's destruction. The villain of the novel, Toohey represents collectivism in its most undiluted form.
Catherine Halsey Toohey's niece and Keating's fiancée. Catherine is an honest girl of only modest intellect and ambition, but she loves Peter sincerely. Keating's betrayal of her robs her of the only personal goal that she possesses and drives her to become one of her uncle's obedient followers.
