13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Griniblix the Spectator57
Eye of Immol'thar59
Mana Burst59–60
Roving Kodo36–37
Brown Prairie Dog1
BRD Trigger1
Alarm-o-Bot60
Doomguard Tap Trigger1
Enslaved Doomguard Commander61
Orb of Domination1
Alliance Battle Standard1
Horde Battle Standard1
Xorothian Imp58–60
Dread Guard60
Injured Peasant51
Plagued Peasant52
Scourge Footsoldier57–59Kel'Thuzad's Minion
Scourge Archer60
Priest Epic Event Caller1
Invisible Trigger One1
Warlock Mount Ritual Mob Type 3, Infernal (DND)1
The Cleaner60
Riding Horse (Dreadsteed)1
Shadowed Spirit60
Corrupted Spirit59–60
Malicious Spirit59–60
Banal Spirit60
Precious the Devourer60Simone's Pet
Swift Stripped Mechanostrider1
Swift Dawnsaber1
Swift Blue Mechanostrider1
Swift Red Mechanostrider1
Riding Horse (Charger)1
Bone Construct60
Drakonid Corpse Trigger1
Warsong Gulch Battlemaster1
Loggerhead Snapjaw1
Leatherback Snapjaw1
Olive Snapjaw1
Hawksbill Snapjaw1

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.