An innovative industrialist known for creating a revolutionary metal alloy who experiences significant personal and philosophical growth throughout the story. He navigates challenges in his personal relationships while striving to align with objectivist beliefs.

A group of exceptional individuals adhering to objectivist principles who contribute significantly to their fields, representing the novel’s idealized vision of productivity and morality. The group includes industrious and principled characters like Wyatt, Francisco, Mulligan, and Hadley.

The principal antagonists who oppose objectivist ideals through their actions and philosophies, often characterized by pettiness and ignorance. Among them are notable figures like Jim Taggart, Wesley Mouch, Dr. Ferris, and Lilian Rearden.