13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Quentin40Thousand Needles
Smolderthorn Mystic55–56Blackrock Spire
Smolderthorn Shadow Priest55–56Blackrock Spire
Smolderthorn Headhunter56–57Blackrock Spire
Scarshield Warlock54–55Scarshield LegionBlackrock Spire
Scarshield Raider54–56Scarshield LegionBlackrock Spire
Firebrand Grunt56–57Firebrand LegionBlackrock Spire
Firebrand Legionnaire57–58Firebrand LegionBlackrock Spire
Firebrand Darkweaver56–57Firebrand LegionBlackrock Spire
Firebrand Invoker56–57Firebrand LegionBlackrock Spire
Firebrand Dreadweaver57–58Firebrand LegionBlackrock Spire
Firebrand Pyromancer57–58Firebrand LegionBlackrock Spire
Smolderthorn Shadow Hunter56–57Blackrock Spire
Smolderthorn Witch Doctor56–57Blackrock Spire
Smolderthorn Axe Thrower55–56Blackrock Spire
Smolderthorn Berserker57–58Blackrock Spire
Smolderthorn Seer56–57Blackrock Spire
Williden Marshal48Un'Goro Crater
Hol'anyee Marshal45Un'Goro Crater
Spark Nilminer45Un'Goro Crater
Petra Grossen46Un'Goro Crater
Dadanga45Un'Goro Crater
Milly Osworth2Elwynn Forest
Donova Snowden50Winterspring
Gaeriyan54Tanaris
Wenikee Boltbucket19The Barrens
Rilli Greasygob22Orgrimmar
Incendosaur47–49Searing Gorge
Houndmaster Grebmar52
Boss Copperplug19The Barrens
Innkeeper Shul'kar30InnkeeperBadlands
Blazerunner56Un'Goro Crater
Swirling Vortex33–34Thousand Needles
Ground Pounder41–43Tanaris
Living Storm48Tanaris
Twilight's Hammer Executioner55–56Blackrock Depths
Scarshield Worg53–54Scarshield LegionBlackrock Spire
Dark Keeper Vorfalk55
Dark Keeper Bethek55Blackrock Depths
Dark Keeper Uggel55Blackrock Depths

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.