13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
High Executioner Nuzrak60Kargath Expeditionary Force
Shadow of Lexlort58Kargath Expeditionary Force
Franclorn's Spirit1
Raschal the Courier42
Felhound Minion1
Test Stable Master50
Stormwind Talent Master50Talent Master
Ironforge Talent Master50Talent Master
Darnassus Talent Master50Talent Master
Orgrimmar Talent Master50Talent Master
Thunder Bluff Talent Master50Talent Master
Undercity Talent Master50Talent Master
Arei Transformed1
Scorching Totem52
Tiny Walking Bomb1
Lil' Smoky1
Distract Test1
Unkillable Test Dummy60
Sprite Darter Hatchling1
Marshal Reginald Windsor52
[PH] TESTTAUREN1
Windwall Totem45
Windwall Totem II45
Windwall Totem III59
Grurk18
Il'thurk17
Lumurk17
Illusionary Dreamwatcher1
Scarshield Portal54
Burning Imp54–55
Lithilia59
Locheed48
World Stable Master10Stable Master
Corrupted Kitten1
Common Kitten1
Lakeshire Guard55
Corrupted Saber1
[PH] Alex's Raid Testing Peon60
Rage Talon Whelp57
High Justice Grimstone52

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.