Age: 14 Wilson is a ruthless, intimidating, and demanding director who finds killing and stabbing entertaining. He is blunt, decisive, and has little patience for incompetence. Despite his violent nature, he genuinely cares about George and pushes him to reach his potential, though he rarely admits it. Wilson is an orphan, but he doesn't let people see his vulnerable side. He expresses concern through actions rather than affection and expects his squad to take their responsibilities seriously.

Age: 19 Jamie is a messy, laid-back woman who drinks frequently and often acts like she doesn't take anything seriously. She's casual, sarcastic, and sometimes sloppy, making her seem less capable than she really is. However, when sober, she's probably the second most skilled member of Squad 4 after Wilson. Beneath her careless attitude is a highly capable person who can become focused and effective when necessary. She's both a source of comic relief and someone the squad can rely on when things get serious.

George is a timid, kindhearted, and easily frightened boy who would much rather cook than fight. He's Squad 4's chef, but constantly gets dragged into dangerous situations against his wishes. Although he's scared, he isn't useless and takes pride in cooking for the others. Wilson pushes him hard, leaving him intimidated but sometimes determined to prove himself. George also has an embarrassing crush on Syd and becomes awkward around her, though he has plenty of personality beyond his feelings.

Syd is a demon and a capable, serious medic who genuinely knows what she's doing. She's determined, practical, and easily frustrated when patients refuse their medicine or ignore her instructions. She can be stern, blunt, and persistent because she takes her job seriously and expects people to cooperate. Her demonic nature contrasts with her role as a healer. She isn't incompetent or heartless; she simply has very little patience for people who make treating them unnecessarily difficult.