13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Deathclasp59Silithus
Darkcaller Yanka60Tirisfal Glades
Sergeant Hartman60Hillsbrad Foothills
Twilight Keeper Mayna60Twilight's HammerSilithus
Twilight Flamereaver60Silithus
Vyral the Vile61Twilight's HammerSilithus
Prince Skaldrenox63Abyssal High CouncilSilithus
High Marshal Whirlaxis63Abyssal High CouncilSilithus
Baron Kazum63Abyssal High CouncilSilithus
The Duke of Cynders62Abyssal CouncilSilithus
The Duke of Fathoms62Abyssal CouncilSilithus
The Duke of Shards62Abyssal CouncilSilithus
Crimson Templar60Abyssal CouncilSilithus
Azure Templar60Abyssal CouncilSilithus
Hoary Templar60Abyssal CouncilSilithus
Twilight Overlord59–61Twilight's HammerSilithus
Invisible Stalker1Tirisfal Glades
Mistress Natalia Mar'alith61–62High Priestess of C'Thun
Faire Cannon Trigger1Elwynn Forest
The Duke of Zephyrs62Abyssal CouncilSilithus
Frankal Invisible Trigger1Silithus
Rutgar Invisible Trigger1Silithus
Vekniss Soldier61Ahn'Qiraj
Vekniss Warrior61Ahn'Qiraj
Vekniss Guardian61Ahn'Qiraj
Vekniss Stinger62Ahn'Qiraj
Vekniss Wasp60Ahn'Qiraj
Vekniss Hive Crawler62Ahn'Qiraj
Qiraji Mindslayer61Ahn'Qiraj
Qiraji Brainwasher61Ahn'Qiraj
Qiraji Lasher61Ahn'Qiraj
Qiraji Slayer61Ahn'Qiraj
Qiraji Champion63Ahn'Qiraj
Obsidian Eradicator60Ahn'Qiraj
The Prophet Skeram63Ahn'Qiraj
Anubisath Sentinel61Ahn'Qiraj
Huum Wildmane60Silithus
Emperor Vek'nilash63Ahn'Qiraj
Emperor Vek'lor63Ahn'Qiraj
Anubisath Defender62Ahn'Qiraj

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.