13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Master Elemental Shaper Krixix60Blackwing Lair
Seeker Cromwell60Undercity
Seeker Nahr60Undercity
Seeker Thompson60Undercity
Officer Jaxon60Stormwind City
Mirelow25Wetlands
Gnawbone24Wetlands
Harb Foulmountain27Thousand Needles
Gibblesnik28Thousand Needles
Uruson7Teldrassil
Grimmaw11Teldrassil
Duskstalker9Teldrassil
Fury Shelda8Teldrassil
Threggil6Teldrassil
Sludginn30Wetlands
Prince Thunderaan63The Wind Seeker
Mor'zul Bloodbringer61Burning Steppes
Gorzeeki Wildeyes55Burning Steppes
Officer Pomeroy60Stormwind City
Officer Brady60Stormwind City
Hunter Sagewind60Thunder Bluff
Hunter Ragetotem60Thunder Bluff
Hunter Thunderhorn60Thunder Bluff
Orcish Orphan4Orgrimmar
Lord Captain Wyrmak45Swamp of Sorrows
Fingat43Swamp of Sorrows
Gilmorian43Swamp of Sorrows
Molt Thorn42Swamp of Sorrows
Blackwing Orb Trigger1Blackwing Lair
Orphan Matron Nightingale10Stormwind City
Orphan Matron Battlewail10Orgrimmar
The Windreaver60Silithus
Whirling Invader57–58Silithus
Blackwing Guardsman61Blackwing Lair
Princess Tempestria60Winterspring
Watery Invader56–58Winterspring
Nefarian's Troops1Blackwing Lair
Blazing Invader54–56Un'Goro Crater
Baron Charr58Un'Goro Crater
Thundering Invader55–57Azshara

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.