Adam is Hattie's enthusiastic and socially awkward 21-year-old uncle with a deep love for I Love Lucy, whose arrival shakes up the routines of Hattie's family life.

Nana is Hattie's grandmother, a strict matriarch who values propriety and social standing, and struggles to accept those who do not fit her ideal.

A wealthy and influential lawyer, Papa has difficulty expressing emotions but shows his love through actions, particularly concerning Adam.

Hattie’s mother, who balances her family’s needs with her own background of wealth and status, and expresses her love and support through thoughtful actions.

Hattie's artistic and industrious father, who supports his family through his work at the boardinghouse while pursuing his creative passions.

Fred Carmel’s niece and a kind-hearted girl who travels with a carnival, connecting easily with Hattie and accepting people for who they are.

An elderly boardinghouse resident who serves as a grandmother figure to Hattie, offering friendship and comfort with her warmth and wisdom.

A retired clock repairman residing in the boardinghouse, who is characterized by his busy nature and initial disinterest in children.

A sophisticated and ambitious young woman aiming to advance her career beyond her current job as a bank secretary, initially admired by Hattie.

Two girls who are known for bullying those they deem different, contributing to Hattie’s social anxiety in school.

A struggling family staying at the Owens’ boardinghouse, with Mrs. Strowsky taking on new work and Catherine becoming friends with Hattie and Betsy.