13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Albino Snapjaw1
Sleepy Dark Iron Worker1
Chambermaid Pillaclencher1
[PH] Horde spell thrower1
[PH] Alliance Spell thrower1
[PH] Alliance Herald60
[PH] Horde Herald60
Warsong Gulch Herald1
Corrupted Fire Nova Totem V52
Corrupted Stoneskin Totem VI54
Corrupted Healing Stream Totem V60
Corrupted Windfury Totem III60
Corrupted Totem1
Corrupted Infernal60
Transporter Malfunction1
Baron Titus Rivendare62
Morbus61
Soulless61
Master Sandoval61
Mana Elemental59–60
Basalt61
Wollstonecraft61
Necrosis61
Stitched Behemoth60
Silent Stalker57–59
Spectral Soldier UNUSED54–55
Unclean Spirit57–59
Doom Wraith54–55
Wailing Widow57–59
Death Siren56–57
Skittering Dread54–55
Nerubian Webspinner57–59
Skeletal Shocktrooper UNUSED54–55
Bone Warder57–59
Decaying Warrior57–59
Blighted Dead54–55
Dread Sorcerer55–56
Plagued Eater UNUSED57–59
Midden Ghoul55–56
Putrid Flyer57–59

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.