13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Windcaller Kaldon60Silithus
Twilight Marauder Morna60Twilight's HammerSilithus
Twilight Marauder58–59Twilight's HammerSilithus
Princess Yauj63Ahn'Qiraj
Vem63Ahn'Qiraj
Cenarion Outrider60Silithus
Elder Morndeep60
Doctor Weavil63Dustwallow Marsh
Doctor Weavil's Flying Machine60Dustwallow Marsh
Number Two61Winterspring
Elder Splitrock60Maraudon
Elder Rumblerock60Burning Steppes
Elder Silvervein60Loch Modan
Elder Highpeak60The Hinterlands
Elder Stonefort60Blackrock Spire
Elder Obsidian60Silverpine Forest
Elder Hammershout60Stormwind City
Elder Bellowrage60Blasted Lands
Elder Darkcore60Undercity
Elder Stormbrow60Elwynn Forest
Elder Snowcrown60Eastern Plaguelands
Elder Ironband60Searing Gorge
Elder Graveborn60Tirisfal Glades
Elder Goldwell60Dun Morogh
Elder Primestone60Silithus
Maws63
Elder Runetotem60Durotar
Elder Ragetotem60Tanaris
Elder Stonespire60Winterspring
Elder Bloodhoof60Mulgore
Elder Winterhoof60Stranglethorn Vale
Elder Skychaser60Westfall
Elder Wildmane60Zul'Farrak
Elder Darkhorn60Orgrimmar
Elder Proudhorn60Thunder Bluff
Elder Grimtotem60Feralas
Elder Windtotem60The Barrens
Elder Thunderhorn60Un'Goro Crater
Elder Skyseer60Thousand Needles
Elder Dawnstrider60Burning Steppes

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.