Inspector Yamitarō Ankokuji serves as warden of the Atami police station, declaring himself a "Messenger of State Power" dedicated to maintaining Atami's peace. His imposing build features shoulder-length black hair and eyes, typically concealed beneath a fedora and trench coat that reflect his manga origins.

Personality-wise, Ankokuji demonstrates unwavering commitment to lawful procedure, exemplified when investigating disappearances tied to the Kabuto household without prematurely accusing Juzo Kabuto. After witnessing Dr. Hell’s Mechanical Beasts threaten Atami, he pragmatically trusts Mazinger Z as a necessary defense. A chain smoker, he develops distinct affection for the reprogrammed android Gamia Q3, calling her "my honey."

His police training includes martial arts proficiency in boxing and karate, alongside firearms expertise—particularly non-lethal chemical-based weapons.

Ankokuji’s history begins with investigating disappearances near the Kabuto residence while guarding Juzo. During Baron Ashura’s attack, he aids the injured Juzo’s escape via Mazinger Z’s fist but witnesses Juzo’s death. Ashura later impersonates Ankokuji to imprison Koji Kabuto, while the real inspector recovers at the Kurogane House. Ankokuji then joins counterattacks against Dr. Hell’s forces, including a mission to Germany concerning Gamia Q.

While infiltrating the Ashura Corps to rescue Shiro Kabuto, he encounters and bonds with Gamia Q3. They survive an energy surge in her containment room with Kenzo Kabuto’s aid. Though briefly imprisoned at the Photon Power Laboratory after Gamia Q3 distrusts Kenzo, they escape during Viscount Pygman’s assault. Ankokuji witnesses Pygman’s demise and the Mycenae Empire’s emergence alongside Gamia Q3.

This character appears exclusively in *Mazinger Edition Z: The Impact!* with no direct presence in other Mazinger iterations or media.