Lily’s friend and primary love interest, Kath shares a strong interest in math and science with Lily and becomes a significant source of support and understanding.

Lily’s childhood best friend, Shirley is confident and comfortable conforming to social expectations, though her relationship with Lily becomes strained over time.

Lily’s mother, who is protective yet presses Lily to conform to traditional Chinese American norms, especially in matters of appearance and behavior.

A Chinese immigrant and Lily’s father, Joseph faces external pressures due to the political climate of the 1950s while also grappling with Lily’s nonconformity.

Lily’s aunt, she works at the Jet Propulsion Lab and initially supports Lily’s interest in space, though she also aligns with Lily’s parents concerning her path.