13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Emerald Warden63Duskwood
Pixi Pilfershard60Soul BrokerWestern Plaguelands
Frijidar60Winterspring
Fallen Knight60Western Plaguelands
Astral Wraith56–58Silithus
Pix Xizzix60Stranglethorn Vale
Sebastian Jurgens61Mad DoctorTirisfal Glades
Techbot62D.E.L.T.ATanaris
Banteazo12–60Moonglade
Nami60Winterspring
Heliath56Blasted Lands
Vengeful Wisp20Felwood
Slack-Jawed GhoulUnknownEastern Plaguelands
Firelands Invader54–55Searing Gorge
Firelands Drudge56–57Searing Gorge
Duke Searbrand59–60Searing Gorge
Obsidian Reaver56–60Searing Gorge
Obsidian Surger55–57Searing Gorge
Flamebringer Elementalist55–56Searing Gorge
Flamebringer Defender55–56Searing Gorge
Flamebringer Stalker55–56Searing Gorge
Enraged Shade53Winterspring
Astral Wraith56–58Silithus
Mokvar60Orgrimmar
Deliana60Ironforge
Ironforge Guard55Ironforge
Outcast Cryomancer60Winterspring
Cursed Mage55–56Eastern Plaguelands
Ada Darkhardt55Western Plaguelands
Uther9999The LightbringerWestern Plaguelands
Gregory60TruthbearerWinterspring
Felguard Elite60Winterspring
Felhound Spellseeker58Winterspring
Rune Broker60Ironforge
Rune Broker60Undercity
BalnazzarUnknown
Grand Crusader DathrohanUnknown
Honey WaspUnknown
Master FeardredUnknown
Legashi SoulstealerUnknown

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.