Lt. Henry Steiger serves as a key officer within the militaristic Chilam Army, acting directly as Captain Robert's right-hand man and subordinate. His role entails active engagement in the Chilam's campaigns and operations, specifically their relentless pursuit of protagonist Kei Katsuragi. Kei is designated a "Tokuiten" or "Singularity," a status driving the Chilam forces' determined efforts to capture him.