Demon lords of the Abyss
The single unifying feature of all demon lords (also called demon princes) is the inherent control over part of the infinite layers of The Abyss. Only the first 666 layers of The Abyss are generally known.
Baphomet, Prince of Beasts: Demon prince of beasts and vengeance.
Dagon: Patron of the deep sea
Demogorgon: Self-proclaimed “Prince of Demons”
Eltab: Prince of hatred and retribution
Fraz-Urb’luu: patron of illusionists and tricksters
Graz’zt: Patron of rulers by force.
Juiblex: Oozes and slimes.
Kostchtchie: 23rd layer of the abyss, the ice wastes; patron of evil frost giants
Obox-ob: Demon Prince and patron of vermin
Orcus: Demon prince of the 113th layer of the Abyss, Thanatos and patron of the undead
Pale Night: princess and theorized mother of the demon lords.
Arch Devils rule over hell and seem to be in a constant conflict with demons. They agree on the evil, the devils however are lawful. The demons chaotic.
Bel: Ruler of the 1st layer of the nine hells
Dispater: 2nd layer
Mammon: 3rd layer
Belial: 4th Layer
Levistus: 5th layer
Glasya: 6th layer
Baalzebul: 7th layer
Mephistopheles: 8th layer
Asmodeus: 9th layer and overlord of the other arch devils