Reizo Kanba is an older man with fair skin, piercing green eyes, and short gray hair marked by distinctive facial tattoos: four on each cheek and two above his eyebrows, resembling Nakiami's. He typically dresses in a white button-up shirt layered over a red turtleneck sweater, paired with gray suit pants and black dress shoes. Kanba presents himself as wheelchair-bound, a disability later revealed as fabricated.

Serving as a key researcher for the East Autonomy Military, Kanba oversees the critical development and transport operations for the Test-Type Xam'd. He directly advises military leadership, notably meeting Commander Kagisu to detail the Test-Type Xam'd's capabilities and risks, explicitly stating Kagisu will bear responsibility for mission failure. During the transport itself, Kanba observes proceedings with a maniacal grin, revealing his deep investment and potentially hidden motivations within this strategic collaboration.