13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Hive'Zara Larva60
Medivh63
Orgrimmar Legion Hexxer60
silithus test mob60
Yauj Brood60
Vekniss Borer60
Xandivious62
Celestine Omencaller60
Jarod Shadowsong63
Eranikus the Redeemed63
Nightmare Phantasm62
Spawn of Fankriss63
Spotlight60
Test dude for 1.81
Tyrande63High Priestess of Elune
Priestess of the Moon60
Eranikus Transformed1
Baby Shark1
Mounted Reindeer1
Black Qiraji Battle Tank1
Glob of Viscidus60
Auctioneer Bernal50
Vek Twins Trigger1
Father Winter's Helper1
Tranquil Mechanical Yeti1
Winter's Little Helper1
Winter Reindeer1
Tiny Snowman1
Black Qiraji Battle Tank1
Blue Qiraji Battle Tank1
Yellow Qiraji Battle Tank1
Green Qiraji Battle Tank1
Red Qiraji Battle Tank1
Ouro Trigger1
Ouro Scarab60
Timbermaw Ancestor60
Mechanical Greench1
Booty Bay Reveler15–25
Drunken Bruiser57
Claw Tentacle60

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.