The empathetic and protective teacher at Hotel Echo, who struggles with her emotions toward the children, particularly Melanie, as she wrestles with her past and the realities of their world.

A seasoned military man leading the surviving group from Hotel Echo, whose initial stern outlook evolves as he adapts to changing circumstances and develops a more nuanced understanding of the children.

A driven and clinical scientist at Hotel Echo, focused on her research and the pursuit of a cure, often clashing with others due to her zealous dedication to her work.

A young soldier with a traumatic past, who finds structure and purpose in the military but is haunted by his fears, ultimately facing challenges that test his resolve and ability to cope.