The most powerful and leader of the Emperors, Hades is the main antagonist of the Ghosts 'n Goblins series with him being behind the events of the series. Hades appears as the final boss in Ultimate Ghosts 'n Goblins.
Sardius is the second most powerful of the emperors and is alternatively known as Samael in Japan. Sardius appears as the final boss of Super Ghouls 'n Ghosts.
Lucifer is the third most powerful of the emperors and is alternatively known as Loki or Rushifell. Lucifer appears as the final boss of Ghouls 'n Ghosts.
Nebiroth is the fourth most powerful emperor and he has no physical form, appearing through Astaroth, whom he will sometimes posses. Nebiroth appears as the semi-final boss of Super Ghouls 'n Ghosts.
Azazel is the fifth most emperor in Makaimura for WonderSwan. He is a giant demon monster that Arthur battles on a demon castle's rooftop.
Astaroth is the weakest of the emperors and is alternativley known as Dark Astaroth. Astaroth is Hades' second in command and is also the most recurring demon emperor appearing as the final boss in Ghosts 'n Goblins and the semi-final boss of Ghouls 'n Ghosts and Ultimate Ghosts 'n Goblins, he is also a normal boss in Super Ghouls 'n Ghosts.
- Phalanx was an Emperor for a short time in Demon's Crest, and The Demon Queen claims that she is the "absolute ruler of all demons"