13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Aspect of Shadow60Scholomance
Ur'dan54Felwood
Ulathek57Felwood
Vartrus the Ancient63Felwood
Stoma the Ancient63Felwood
Hastat the Ancient63Felwood
Simone the Inconspicuous60Un'Goro Crater
Precious60Simone's PetUn'Goro Crater
Franklin the Friendly60Burning Steppes
Solenor the Slayer60
Artorius the Amiable60Winterspring
Razzashi Venombrood60Zul'Gurub
Simone the Seductress60
Klinfran the Crazed60
Artorius the Doombringer60
Nelson the Nice60Silithus
Swift Timber Wolf10Orgrimmar
Swift Brown Wolf10Orgrimmar
Swift Gray Wolf10Orgrimmar
Great White Kodo1–2Mulgore
Swift Olive Raptor1–2Durotar
Swift Orange Raptor1–2Durotar
Swift Blue Raptor1–2Durotar
Swift Brown Ram1–2Dun Morogh
Swift White Ram1–2Dun Morogh
Swift Gray Ram1–2Dun Morogh
Great Brown Kodo1–2Mulgore
Great Gray Kodo1–2Mulgore
Swift Yellow Mechanostrider1–2Dun Morogh
Swift White Mechanostrider1–2Dun Morogh
Swift Green Mechanostrider1–2Dun Morogh
Swift Mistsaber1–2Darnassus
Swift Frostsaber1–2Darnassus
Purple Skeletal Warhorse1–2Tirisfal Glades
Swift Palamino1–2Hillsbrad Foothills
Swift White Steed1–2Dustwallow Marsh
Swift Brown Steed1–2Hillsbrad Foothills
Terrordale Spirit59–60Eastern Plaguelands
Ancient Equine Spirit60Dire Maul
Derotain Mudsipper52The Thorium BrotherhoodTanaris

Classic reference data from QuestieDB (Forever data, commit c5de61a), with positions on Forever's zone maps. It doesn't confirm that an NPC, location, quest or item is in Forever.