Review of Kamen Rider Agito: Project G4

The Superintendent General was portrayed by Hiroshi Fujioka, best known for his role of Takeshi Hongo/Kamen Rider 1, the original protagonist of Kamen Rider. His cameo appearance in Project G4 was a commemoration of the Kamen Rider 30th Anniversary, with his dialogue to Shoichi being an allusion to his previous role.
While his name remained unrevealed, it is strongly implied from external sources that the MPD Superintendent General is in-fact Takeshi Hongo himself.