A resident at the Ennet House addiction rehabilitation center, whose life is shaped by his difficult past and efforts toward recovery, acting as a contrast to Hal's background.

A filmmaker and physicist who founded the Enfield Tennis Academy, known for his various artistic and scientific pursuits as well as his struggles with alcohol addiction.

A mysterious figure who hides behind a veil, using various identities throughout the novel, and grapples with issues of identity and self-perception.

An agent for the Office of Unspecified Services who goes undercover as a female reporter, raising questions about loyalty, patriotism, and the nature of gender.

The middle son of the Incandenza family, notable for his physical limitations, genuine sincerity, and interest in filmmaking, offering a unique perspective among his family.