Anna Wulf - The protagonist, a divorced single mother and writer struggling with mental fragmentation. She keeps four colored notebooks (black, red, yellow, blue) to compartmentalize different aspects of her life, and starts a fifth golden notebook to try to unify her experiences.

Molly Jacobs - Anna's close friend, also a divorced single mother and former actress.

Tommy Portmain - Molly's son who attempts suicide.

Richard Portmain - Molly's ex-husband and Tommy's father.

Marion Portmain - Richard's second wife.

Saul Green (also called Milt) - An American writer who has an affair with Anna.

Max Wulf - Anna's ex-husband.

Janet Wulf - Anna and Max's daughter.

Michael - Anna's former lover, fictionalized in her "Yellow Notebook."

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