(in order of appearance)
- Pvt. Oya - A Private in the Japanese SDF.
- Special Medical Director Dobashi - A medical doctor doing psychological research on Oya in an attempt to understand why soldiers follow orders....or not. Under the command of Colonel Masahiro
- Seaman Shinsaku - works in the ship's galley
- Colonel Masahiro of Defense Intelligence - director of Dobashi's research project
- Lieutenant Shimousa - Masahiro's assistant, part of the ship's crew but "on loan" to Colonel Masahiro
- Lt. Hardin - mentioned in the story - US Special Forces, puts Pvt. Oya in the hospital.
- Captain Yutak - the ship's Captain
- Admiral Dardtso of Defense Intelligence - head of the project to develop drugs for turning soldiers into order-following "zombies"
- Lieutenant Fukusa - a military currier who brings secret orders from Admiral Dardtso to Colonel Masahiro
- Lieutenant Junior Grade Murata - a junior deck officer, often supervises the loading of helicopters that shuttle mail and passengers via the ship's helipad
- Naval Air Pilot Techiek - helicopter pilot
- Lieutenant Hachihei of Defense Intelligence - planted by Admiral Dardtso within Dr. Dobashi's research project