Kujaku Nijō operates as the information analyst "Analyzer" for the Special Crime Investigation Unit. An elf by heritage, he maintains a reserved and calm demeanor. He keeps his personal life largely private and typically holds some distance from other unit members, avoiding unnecessary self-disclosure.

A defining element of his past is a terrorist attack at an airport nine years prior, where he lost his older brother. This brother, a detective, saved Seiji Nanatsuki during the same incident, creating an indirect link between Kujaku and Seiji. This tragedy fuels his strong aversion to pro-dragon terrorists seeking to restore draconic dominance and drives his commitment to opposing them.

Working primarily from the unit's base, he specializes in information analysis and maintains extensive connections within an information network. He leverages these connections and analytical skills for investigations, processing collected data with methodical precision. Physically, he possesses silver hair, blue eyes, and wears glasses, reflecting his role as the unit's primary intelligence specialist.

Despite his reserved nature, it does not preclude collaboration. He works alongside other unit members during operations, contributing his analytical expertise to support field agents and advance investigations against terrorist threats.