13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Spirit of Korth'azz63
Polymorphed Cow3
Stormwind Celebrant1–60
Ironforge Celebrant1–60
Yuree60Dawn Whisperer
Darnassus Celebrant1–60
Orgrimmar Celebrant1–60
Thunder Bluff Celebrant1–60
Undercity Celebrant1–60
Midsummer Merchant60Festival Supplies
Plagued Guardian61
Plagued Construct61
Plagued Champion61
Plagued Warrior61
Midsummer Merchant Horde Costume60Festival Supplies
Midsummer Merchant Alliance Costume60Festival Supplies
Festival Flamekeeper Costume: Tauren1
Festival Flamekeeper Costume: Human1
Festival Flamekeeper Costume: Troll1
Festival Flamekeeper Costume: Dwarf1
Johnny McWeaksauce60Public Test Realm Bot
Cinder Elemental1
Sapphiron's Wing Buffet60
Varel Redrock35
Varl Stonebleeder35
Maexxna Spiderling60
Sandworm63
Jimmy McWeaksauce10Cool Guy
Worm Target (DND)1
William Kielar60Spectral Gryphon Master
[PH] Plaguelands Herald1
Felguard58
White Tiger Cub1
Hippogryph Hatchling1
Purple Ogre Costume60
Riding Turtle1
Lottery Commissioner [DND]1
Unkillable Test Dummy Spammer60
Lordaeron Mage60
Lordaeron Spirit60

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.