Augusten’s mother, depicted as a talented writer who struggles with severe mood swings and a complicated relationship with her son.

An eccentric psychiatrist and head of the Finch family, whose controversial practices and unpredictable behavior create chaos in Augusten's life.

Dr. Finch's loyal and seemingly stable daughter, who complicates Augusten's perception of normalcy with her unfailing support of her father.

Dr. Finch's daughter and Augusten's closest friend, sharing in his aspirations and experiences, and providing a semblance of camaraderie in an otherwise chaotic environment.

The adult adopted son of the Finch family who becomes involved in an inappropriate and complicated relationship with Augusten.

The beleaguered wife of Dr. Finch, depicted largely as a detached and overwhelmed housewife struggling to maintain order in a chaotic household.

Augusten’s emotionally distant father, a math professor whose strained marriage and aloof demeanor impact Augusten's views on relationships.

Augusten's brother, who is infrequently present but remains a significant influence in Augusten’s life, noted for his reliability and interest in electrical engineering.