Sid's best friend and a fellow jazz musician from Baltimore; Chip has a darker complexion and remains in the music industry post-war, known for his humor that hides deeper emotions.

A young, dark-skinned German musician of mixed ancestry, recognized for his exceptional musical talent under challenging conditions.

A Canadian singer and Louis Armstrong's representative who acts as both a caretaker for Hiero and Sid's love interest, noted for her determination and artistic ambitions.

The manager and clarinet player for the Hot-Time Swingers, known for using his resources to support his friends and protect them from danger.

A legendary trumpeter who appears as a mentor figure within the story, impacting several characters uniquely through his musical genius.

An alto saxophonist for the Hot-Time Swingers, a German man initially unconcerned with the Nazis' rise to power but later faces consequences due to his choices.

The pianist for the Hot-Time Swingers and a longtime friend of Ernst, responsible for introducing Hiero to the group, with a life affected by the harsh realities of his time.