A first-class passenger aboard the Aurora, Kate is adventurous and determined to prove the validity of her late grandfather's journal entries. Her curiosity and desire for knowledge often draw Matt into her explorations.

The captain of the airship Aurora, Walken is a calm and confident leader who serves as a mentor to Matt, offering guidance and support in challenging situations.

An air pirate and primary antagonist, Szpirglas is theatrical yet ruthless, using a facade of civility to mask his violent intentions. His actions and stories contrast with Matt's own experiences aboard the Aurora.

A junior sailmaker and son of the Aurora’s owner, Bruce initially rivals Matt both professionally and romantically but ultimately becomes an ally. He represents class divides, with his privilege allowing him advantages that conflict with Matt’s hands-on experience.