Thomas is a thoughtful and observant writer born into a wealthy trading family. Struggling with a sense of displacement after his father's death, he cultivates a respectable public persona to mask his private desires and same-sex attractions. He translates his intense emotional life and family dynamics into highly successful novels. As political tensions rise in Europe, his initially conservative views undergo significant changes.

Katia is the pragmatic and highly organized daughter of a cultured Jewish family in Munich. As Thomas's wife, she effectively manages their household and shields him from domestic interruptions so he can write. She approaches life with a sharp wit and logical mind, recognizing her husband's secret attractions and granting him space as long as their family stability remains secure.

Heinrich is Thomas's older brother and an accomplished novelist. Unlike his more reserved brother, Heinrich is fiery, left-leaning, and politically outspoken from a young age. He writes sweeping social satires and regularly challenges Thomas's views on the purpose of literature, driving a lifelong professional and personal rivalry between them.

Julia is the mother of the Mann siblings, originally born in Brazil before moving to Germany. She is an elegant, free-spirited woman whose dramatic mannerisms make her an outsider in a conservative town. After her husband's death, she moves the family to Munich, fostering an artistic environment that profoundly shapes her children's imaginations.

Klaus is Thomas and Katia's second child. Outspoken and intensely sensitive, he refuses to finish his high school exams, preferring to live openly as an artist and a radical. He forms a fiercely close bond with his sister Erika and frequently pushes his father to adopt more direct political stances.

Erika is the eldest child of the Mann family. Talkative and politically engaged, she pursues a career in acting and writing while openly challenging conservative norms. She frequently teams up with her brother Klaus and later takes on the roles of secretary and organizer for her father.

Johann is the patriarch of the Mann family and a respected senator in Lübeck. He runs a prosperous trading business and tries to instill traditional German values in his children. He maintains a tight grip on his family's finances, leaving directives that control Julia's choices even from beyond the grave.

Carla is Thomas and Heinrich's younger sister. She harbors ambitions of becoming a stage actress and enjoys attending the theater in Munich. She struggles with the conflicting desires of achieving fame in the arts and maintaining a traditional family life.

Lula is one of Thomas's younger sisters. She moves to Munich with her mother after the senator's death and grows up in the shadow of her more artistic and boisterous siblings.

Viktor is the youngest of the Mann siblings. He moves to Munich with his mother and eventually gets conscripted into the army during the war, holding conservative political sympathies as he grows older.

Golo is the third child of Thomas and Katia. Quieter and more self-contained than his older siblings, he displays a keen political consciousness. He becomes highly organized, helping his parents secure important belongings, like Thomas's diaries, during times of crisis.

Monika is the fourth child of Thomas and Katia. She grows up in a bustling household and frequently travels with her family during their relocations, eventually marrying Hungarian art historian Jeno Lanyi.

Elisabeth is the fifth child of the Mann family and a favorite of her father. She brings Thomas deep comfort during times of political unrest and eventually surprises her family by deciding to marry an older Italian professor.

Michael is the youngest child of Thomas and Katia. He grows up to become an accomplished musician, playing the viola in a quartet. His musical talent charms his father and occasionally sparks creative inspiration for Thomas's novels.

Klaus is Katia’s twin brother. A musician who studies with Gustav Mahler, he enjoys a teasing, exclusionary dynamic with his sister. He easily mocks conservative patriotism and shares his family's cultured, ironic sensibilities.

Agnes is the German wife of the owner of *The Washington Post*. Highly connected in political circles, she uses her influence to assist Thomas and his extended family with visas and safe passage during their exile in the United States.

Armin is the son of a local mill owner and a classmate of Thomas at the Katharineum school in Lübeck. He is the first person to awaken romantic feelings in young Thomas, who secretly writes love poems dedicated to him.

Hunehmann is a fellow clerk who works alongside Thomas at Spinelli’s Fire Insurance in Munich. He closely observes Thomas's secret writing habits during work hours and harbors intense, unrequited feelings for him.

Paul is a musician who strikes up a friendship with Thomas during the drafting of his first novel. Though Thomas takes his literary ambitions seriously and shares his progress eagerly, Paul often appears politely distracted by the intense focus.

Alfred is a famous math professor who runs a wealthy and artistic household in Munich. He is highly protective of his family's reputation, going so far as to furnish an apartment for Thomas and Katia without consulting them.

Mimi is a Czech actress who becomes Heinrich's first wife. She maintains a correspondence with Katia even when the Mann brothers are politically estranged, eventually facing great danger during the war.

Nelly is Heinrich's younger, second wife. Her loud and boisterous manner offends Katia's sensibilities, leading to tension and snobbery from the rest of the Mann family, despite Nelly's kindness to others.

Alma is the dramatic, larger-than-life widow of composer Gustav Mahler. She creates social tension with her brash remarks but holds a favored place in Katia and Thomas's circle, despite her controversial political dealings.

Klaus is the seventeen-year-old son of a famous art professor who stays with the Manns for a summer. He forms a mutual attraction with Thomas, visiting his study daily to listen to him discuss writing.

Frido is Michael and Gret's young son. He completely charms his grandfather Thomas, who performs magic tricks for him and closely observes him for literary inspiration, causing tension in the family.