Spensa’s best friend from childhood who follows her to flight school but eventually discovers his real passion lies in engineering and technology, rather than piloting.

The flight leader of Spensa's cadet group, whose privileged background and initial arrogance are challenged by the experiences and responsibilities of flight school.

A fellow cadet from the same cavern as Spensa, initially hesitant to associate with Spensa, but they eventually form a bond through mutual bravery and camaraderie.

An experienced instructor and former wingmate of Spensa's father, who mentors and supports her despite the controversy surrounding her family.

The admiral of the Defiant Defense Force, driven by the need to protect humanity from the Krell, and grappling with the legacy and implications of Spensa's father's past.