13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Scott's Test Dummy58TEST, Don't BUG
Rookery Whelp56–57
Riding MechaStrider (Flourescent Green)1
Riding MechaStrider (Black)1
Riding MechaStrider (Steel)1
Moonflare Totem54
Berylgos62
Flame Buffet Totem56
Superior Healing Ward56
Worg Pup1
Burning Felhound54–55
UNUSED [PH] Flamewreath Guard58–59
Captured Felwood Ooze30
Krysteea50Warrior Trainer
Rombulus Frostmoon40Dagger Trainer
Malakar Frostmoon40Fist Weapons Trainer
Jennail Mooncaller40Staves Trainer
Gerratys Nightrunner40Bow Trainer
Traelion Shadewhisper40Thrown Weapons Trainer
Riding Tiger (White)1
Riding Tiger (Leopard)1
Riding Tiger (Orange)1
Riding Tiger (Gold)1
Vaelastrasz the Red62
Spiteful Phantom58–59
Black Guard Warrior59–60
Black Guard Executioner61–62
Emily Vaccar40Polearm Trainer
Sarah Arello40Staves Trainer
Farbrahm Steelfist40Mace Trainer
Grimbur Flintaxe40Axe Trainer
Filliwick Featherfizz40Crossbow Trainer
Rend on Drake Visual1
Plagued Insect55
Styleen Silvercart40Exotic Item Vendor
Mana Tide Totem42
Scholomance Shadowcaster40
Risen Lackey55–56
Risen Flayer40–41
Risen Terror40–41

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.