13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Skul58Stratholme
Black Guard Sentry58–59Stratholme
Thuzadin Shadowcaster58–59Stratholme
Thuzadin Acolyte59–60Stratholme
Thuzadin Necromancer59–61Stratholme
Plague Ghoul57–58Stratholme
Ghoul Ravener58–59Stratholme
Fleshflayer Ghoul59–60Stratholme
Rockwing Gargoyle57–58Stratholme
Rockwing Screecher58–59Stratholme
Eye of Naxxramas55–57Stratholme
Crypt Crawler58–59Stratholme
Crypt Beast59–60Stratholme
Patchwork Horror57–58Stratholme
Ash'ari Crystal60Stratholme
Bile Spewer59–60Stratholme
Venom Belcher60–61Stratholme
Crimson Guardsman57–58Stratholme
Crimson Conjuror57–58Stratholme
Crimson Initiate57–58Stratholme
Crimson Defender58–59Stratholme
Crimson Sorcerer58–59Stratholme
Crimson Priest58–59Stratholme
Crimson Gallant59–60Stratholme
Crimson Battle Mage59–60Stratholme
Crimson Inquisitor59–60Stratholme
Pao'ka Swiftmountain30Thousand Needles
Motega Firemane28Thousand Needles
Warchief Rend Blackhand62Blackrock Spire
The Beast62Blackrock Spire
Gregor Greystone55The Argent DawnWinterspring
Vectus60Scholomance
Marduk Blackpool58Scholomance
Magistrate Barthilas58Stratholme
Baroness Anastari59Stratholme
Nerub'enkan60Stratholme
Maleki the Pallid61Stratholme
Ramstein the Gorger61Stratholme
Baron Rivendare62Stratholme
Plagued Rat55Stratholme

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.