13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Twilight Keeper Exeter60Twilight's HammerSilithus
Twilight Keeper Havunth60Twilight's HammerSilithus
Jarund Stoutstrider55The Cenarion CircleSilithus
Sentinel Onaeya20Ashenvale
Tristane Shadowstone15Dun Morogh
Grum Redbeard55Winterspring
Howin Kindfeather45The Hinterlands
Narain Soothfancy45Tanaris
Claira Kindfeather43The Hinterlands
Kerr Ironsight41The Hinterlands
Kali Remik12Durotar
Voriya56Darkshore
Una Ji'ro12Darkshore
Krah'ranik1Darkshore
Orik'ando42Feralas
Jory Zaga1Darkshore
Locke Okarr28Ashenvale
Darn Talongrip30Stonetalon Mountains
Moonglade Warden55Moonglade
Vark Battlescar10Desolace
Erik Felixe45Feralas
Paige Felixe46Feralas
Kristy Grant45Feralas
Kimberly Grant35Stormwind City
Kelly Grant40Stormwind City
Fahrak42Ashenvale
Hakkari Priest60Zul'Gurub
Hakkari Witch Doctor60Zul'Gurub
Keeper Remulos62Moonglade
Rahauro20Magatha's ServantThunder Bluff
Maur Grimtotem14Ragefire Chasm
Theodore Griffs50Undercity
Captured Rabid Thistle Bear14Darkshore
Wildpaw Shaman53–54Alterac Valley
Wildpaw Mystic56–57Alterac Valley
Wildpaw Brute56–57Alterac Valley
Wildpaw Alpha58–59Alterac Valley
Kaya Flathoof15Stonetalon Mountains
Makaba Flathoof25The Barrens
Grundig Darkcloud18Stonetalon Mountains

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.