Dungeons & Dragons could get very weird what with journeying through hell & the planes & everything. Here's more of my demons & devils for Labyrinth Lord.
Nalfeshnee: Nalfeshnees are enormous demons that judge new souls arriving on the Abyss.
Marilith: THe Marilith are cruel & cunning demons that love battle.
Ice: The frigid eighth plane of Hell is populated in the main with ice devils. Being greater devils, they have personal names.
Pit Fiend: Lord of devils, with great strength and deadly power.
Hezrou: Hezrous are obedient demons who are eager to serve more powerful demons and summoners.
Orcus: Orcus is a very old demon. Like many of the most powerful demon lords who struggle for power in the Abyss, Orcus started his existence as a mortal on the Prime Plane. He was apparently a wicked spellcaster of some sort, most probably a priest to some dark deity. After his death, his soul, like the souls of all chaotic evil mortals, went to the Abyss and Orcus began his afterlife as a lowly larva. Orcus proceeded to climb through the demonic ranks in the next several thousand years, going from larva to mane, from mane to dretch, from dretch to rutterkin, from rutterkin to vrock, from vrock to glabrezu, from glabrezu to nalfeshnee and eventually a balor. From there, he ascended to the rank of demon lord, becoming the Prince of the Undead and ruling the layer of Thanatos, the Belly of Death. Even though there are other demon lords aspiring to the title of "Prince of the Undead", Orcus' claim to the title has gone unchallenged for the most part. Ever hungry for more power, Orcus wanted to be recognized as "Prince of Demons", a title held by Demogorgon and coveted also by Graz'zt. As a result, he became the arch-enemy of both demon lords. In time, Orcus also achieved true godhood.