13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Gnomeregan - Matrix Punchograph 3005-A43–45
Irradiated Ozzie10
Test Auctioneer50
Sen'jin Guardian55
Sharpbeak's Father55
Sharpbeak's Mother55
Dark Iron Land Mine32–33
Thelsamar Mountaineer40
Waurg42Food & Drink
Sul'lithuz Warder48
Servant of Antu'sul48
Soul of Tanaris51
Paladin 10 Alternate10
Paladin 20 Alternate20
Paladin 30 Alternate30
Paladin 40 Alternate40
Atal'ai Skeleton46–47
Mechanical Chicken1
Ahdi of Shadow Hall47
Horizon Scout First Mate43
Horizon Scout Cook42
Horizon Scout Engineer42
Roland Geardabbler43
Or'lin Oakenfist50
Makron the Corrupt53
Dorius50
Xiggs Fuselighter's Flyingmachine45
Second Mate Shandril43
Kalaran the Deceiver55
TEST Uber Night Elf1
TEST Uber Succubus1
TEST Uber Abomination1
TEST Uber Crypt Fiend1
TEST Uber Human1
Hex of Jammal'an1
Eranikus the Chained1
Atal'ai Totem51
Putrid Slayer58–60
Interloper42–43
Necrolyte54–55Cult of the Damned

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.