13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Earthcaller Franzahl62Winterspring
Pimgib56Dire Maul
Gordok Bushwacker58–59Dire Maul
Mizzle the Crafty60Dire Maul
Pusillin57Dire Maul
Azj'Tordin60Feralas
Sawfin Frenzy38–40Swamp of Sorrows
Lake Thresher25Redridge Mountains
Shen'dralar Ancient60Dire Maul
Shen'dralar Wisp1Dire Maul
Thief Catcher Shadowdelve60Ironforge
Thief Catcher Farmountain60Ironforge
Thief Catcher Thunderbrew60Ironforge
Lorekeeper Lydros60Dire Maul
Shen'dralar Zealot59Dire Maul
Cadaverous Worm60
Shen'dralar Provisioner52Dire Maul
Winterfall Ambusher56–57
Sage Korolusk59Feralas
Scholar Runethorn59Feralas
Scout Stronghand60Orgrimmar
Scout Manslayer60Orgrimmar
Scout Tharr60Orgrimmar
Huntress Skymane60Darnassus
Huntress Ravenoak60Darnassus
Huntress Leafrunner60Darnassus
Lorekeeper Javon60Dire Maul
Lorekeeper Mykos60Dire Maul
Lorekeeper Kildrath58Dire Maul
Doomguard Minion59–60
Wandering Eye of Kilrogg60Dire Maul
Lothos Riftwaker60Searing Gorge
Rogue Black Drake50–51Elwynn Forest
Expeditionary Mountaineer37Elwynn Forest
Overlord Runthak60Orgrimmar
Expeditionary Priest40Elwynn Forest
Major Mattingly60Stormwind City
Eldreth Darter58–59Dire Maul
Arcane Torrent59–60Dire Maul
Arcane Feedback59–60Dire Maul

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.