
Quick answer — Gou Nagai worked on Getter Robo: Armageddon (Original Creator), Devilman Crybaby (Original Creator), Devilman: The Birth (Original Creator) and 9 more anime.
Gou Nagai worked on Getter Robo: Armageddon (Original Creator), Devilman Crybaby (Original Creator), Devilman: The Birth (Original Creator), Re: Cutie Honey (Original Creator), Devilman: The Demon Bird (Original Creator), Mazinger Z (Original Creator), Devilman (Original Creator), Robot Girls Z (Original Creator) and 4 more.