Who is the protagonist in Ayn Rand's most notable novel?
Objectivism (Ayn Rand):  Rand first expressed Objectivism in her fiction, most notably "The Fountainhead" (1943) and "Atlas Shrugged" (1957), and later in non-fiction essays and books. The Fountainhead:  The novel's protagonist, Howard Roark, is an individualistic young architect who designs modernist buildings and refuses to compromise with an architectural establishment unwilling to accept innovation.
Howard Roark