Ethel, Billy's sister, is a strong-willed and intelligent leader. She is involved in social reform, particularly concerning women's rights and workers' conditions, and she becomes an influential editor and campaigner.

An aristocrat passionate about social justice and women's rights, Maud defies societal norms by marrying a German and working towards peace and suffrage. She runs a clinic for unwed mothers and a publication for soldiers' wives.

A wealthy and traditional aristocrat, Fitz is resistant to social change and believes in the primacy of aristocratic rule. He holds a leadership position in the army and manages operations against revolutionary forces.

A Russian of humble origins who rises through his intelligence and leadership in the Bolshevik movement. He takes care of his brother Lev and is dedicated to the revolutionary cause in Russia.

A German aristocrat who opposes the war and favors diplomacy. Married to Maud, he navigates secretive diplomatic missions and military leadership during the war.

An American political aide working closely with President Woodrow Wilson. He grows from a socially awkward young man into a mature and capable leader, balancing his personal relationships and professional duties.