13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Pixel34Ashenvale
Je'neu Sancrea25Earthen RingAshenvale
Mastok Wrilehiss30Ashenvale
Nori Pridedrift5Dun Morogh
Onyxia's Elite Guard60
Faustron55Wind Rider MasterMoonglade
Karang Amakkar35Ashenvale
Onyxia Trigger1Onyxia's Lair
Tideress27Ashenvale
Hraug9Demon TrainerDurotar
Lieutenant Rachel Vaccar55Champions' Hall
Archmage Gaiman55Champions' Hall
Sergeant Major Skyshadow55Champions' Hall
Master Sergeant Biggins55Officer Accessories QuartermasterChampions' Hall
Lieutenant Karter53Mount VendorChampions' Hall
Lieutenant Jackspring55Reagent VendorChampions' Hall
Sergeant Major Clate55Food and DrinkChampions' Hall
Guard Quine62Champions' Hall
Guard Hammon62Champions' Hall
Legionnaire Teena62Hall of Legends
Blood Guard Hini'wana62Hall of Legends
Advisor Willington62Hall of Legends
Chieftain Earthbind62Hall of Legends
Lady Palanseer55Armor QuartermasterHall of Legends
Brave Stonehide55Officer Accessories QuartermasterHall of Legends
Stone Guard Zarg55Food and DrinkHall of Legends
First Sergeant Hola'mahi55Reagent VendorHall of Legends
Raider Bork55Mount QuartermasterHall of Legends
Grunt Korf62Hall of Legends
Grunt Bek'rah62Hall of Legends
Sergeant Ba'sha55Accessories QuartermasterOrgrimmar
Chimaerok60–61Feralas
Arcane Chimaerok60–62Feralas
Chimaerok Devourer61–62Feralas
Lord Lakmaeran62Feralas
Officer Areyn55Accessories QuartermasterStormwind City
Greshka50Demon MasterSwamp of Sorrows
Xen'Zilla25Stonetalon Mountains
Ruul Snowhoof26Ashenvale
Wandering Protector35Ashenvale

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.