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Fiends of Mystaraby Marco Dalmonte
Well, first of all let me state that a demon is generally different from a full fledged immortal of the Sphere of Entropy. Both are immortals, but the demons usually have a fixed state and appearance and can only cast specific spells using certain amounts of power (I don't use the rules of WotI but the old rules of gold box slightly modified).
Normal demons are of 7 different types: shrieking, croaking, howling, groaning, hissing, roaring and whispering demons respectively.
Then there are the Entropic lords, like Alphaks (who's an immortal who simply chose to look like a roaring demon), Atzanteotl, Leptar, Hel and even Orcus and Demogorgon are immortals, not just exalted fiends.
The list of the commonly known immortals of Entropy of Mystara is the following (drawn straight from my Guide to Mystaran Immortals):
Rank Name Level Align. Portfolio Hierarch Hel 36 C Chaos, reincarnation, death, lifeforce manipulation Thanatos 35 C Death, decay, destruction, end of all lifeforms Nyx 33 N Night & darkness, undead, necromancy Atzanteotl 31 C Corruption, deceit, betrayal, Azcans, humanoids Eternal Loki 30 C Hule, deceit, lies, cleverness, theft, betrayal Masauwu 28 C Intrigue, manipulation, corruption Demogorgon 26 C Demons, undead, destruction Orcus 25 C Suffering, mass destruction, undead Talitha 25 C Egocentrism, envy, theft, murder, primal instincts Empyreal Set 21 C Hate, vendetta, cruelty, poison, snakelike beings Alphaks 20 C Destroy Alphatians, hate, command over the weak Corona 19 C Disease, corruption, the Dark Side Celestial Ranivorus 18 C Gnolls, raids, folly Arik 17 C Beholders, massacres, folly, nightmares Skuld 15 C Fury, cruelty, suicide Jammudaru 14 C Ogres, hate, revenge, brutality, pain Leptar 13 C Torture, sufferance, oppression, despotism Temporal Yagrai 12 C Hobgoblins, orcs, strong will Idris 11 C Vengeance, destroy elves, create perfect draconic race Brissard 10 C Slavery, deceit, oppression Bagni Gullymaw 9 C Trolls, cannibalism, violence Danel 7 C Tiger Clan, betrayal, pain, survival of the fittest Initiate Arachne Prime 6 C Slavery, planar spiders, aranea Travestis 2 C Evil woodland beings, poison, deforestation Saasskas 1 C Devilfishes, conquest, sea undead
PS: I associated Hircismus (an immortal featured in one of the Immortal modules, IM3 I believe) to Leptar since the two seem to have similar goals and personality.
And that's all I can tell about this, hope it's enough ;)