13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
High Priestess Mar'li Transform Visual1
High Priestess Arlokk Transform Visual1
Poisonous Cloud60
Defilers Emissary40Thunder Bluff
League of Arathor Emissary40Ironforge
Voodoo Spirit60
Jungle Toad1
Gurubashi63
Spirit of Jin'do1
Heart of Hakkar1
Pat's Hellfire Guy1
Gri'lek45–46
Booty Bay Elite61
Swift Razzashi Raptor1
Silverwing Emissary22Stormwind City
Stormpike Emissary55Stormwind City
Swift Zulian Tiger1
Warsong Emissary30Thunder Bluff
Frostwolf Emissary55Thunder Bluff
Primal Blessing Visual1
Gurubashi Prisoner60
Master Angler Form1
Gahz'ranka Dead1
[PH] Kris Zierhut63Designer Extraordinaire
Killable Test Dummy 60 Warrior60
Outlands Test Dummy Warrior 7063
Chromatic Drake Mount1–2
Hammerfall Elite55
Menethil Elite55
Silverpine Elite55
Gahz'ranka Herald1
Pat's Splash Guy1
Portal of Madness1
Outlands Test Dummy Warrior 6060
Outlands Test Dummy Warrior 6363
Outlands Test Dummy Warrior 6563
Outlands Test Dummy Warrior 6763
Outlands Test Dummy Warrior 5555
Outlands Test Dummy Warrior 5656
Outlands Test Dummy Warrior 5757

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.