13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Elder Dreamseer60Tanaris
Elder Mistwalker60Feralas
Elder High Mountain60The Barrens
Eye of C'Thun63Ahn'Qiraj
Ossirian Crystal Trigger60Ruins of Ahn'Qiraj
Minion of Weavil60–61Dustwallow Marsh
Elder Windrun60Eastern Plaguelands
Elder Starsong60The Temple of Atal'Hakkar
Elder Moonstrike60Western Plaguelands
Elder Bladeleaf60Teldrassil
Elder Starglade60Stranglethorn Vale
Elder Moonwarden60The Barrens
Elder Bladeswift60Darnassus
Elder Bladesing60Silithus
Elder Skygleam60Azshara
Elder Starweave60Darkshore
Elder Meadowrun60Western Plaguelands
Elder Nightwind60Felwood
Elder Morningdew60Thousand Needles
Elder Riversong60Ashenvale
Elder Brightspear60Winterspring
Elder Farwhisper60Stratholme
Cenarion Scout Landion60Silithus
Cenarion Scout Azenel60Silithus
Cenarion Scout Jalia60Silithus
Krug Skullsplit60Orgrimmar Legion CaptainSilithus
Merok Longstride60Silithus
J.D. Shadesong61Silithus
Shadow Priestess Shai60Silithus
Orgrimmar Legion Grunt60Silithus
Orgrimmar Legion Axe Thrower60Silithus
Hive'Regal Hunter-Killer60
Forest Wisp8Teldrassil
Twilight Corrupter63Duskwood
Auctioneer Jaxon50Stormwind City
War Effort Volunteer30Ironforge
Metzen the Reindeer5Searing Gorge
Auctioneer Stockton50Undercity
Auctioneer Yarly50Undercity
Auctioneer Graves50Stranglethorn Vale

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.