13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Zaeldarr the Outcast54–55Eastern Plaguelands
Mark of Detonation (CLS)1Eastern Plaguelands
Mark of Detonation (CRS)1Eastern Plaguelands
Mark of Detonation (CSH)1Eastern Plaguelands
Mark of Detonation (NESH)1Eastern Plaguelands
Mark of Detonation (NE)1Eastern Plaguelands
Mark of Detonation (SE)1Eastern Plaguelands
Razorlash48Maraudon
Gehennas63Molten Core
Infected Mossflayer57–58Eastern Plaguelands
Ziggurat Protector58Eastern Plaguelands
Slaughterhouse Protector58Eastern Plaguelands
Shazzrah63Molten Core
Melizza Brimbuzzle39Desolace
Sickly Gazelle3The Barrens
Cured Gazelle1The Barrens
Sickly Deer5Darkshore
Cured Deer1Darkshore
Burning Blade Toxicologist14The Barrens
Burning Blade Crusher13The Barrens
Stormscale Toxicologist15Darkshore
Quel'Lithien Protector60Eastern Plaguelands
Brother Crowley44Scarlet Crusade EmissaryStormwind City
Crimson Courier60Eastern Plaguelands
Shadowprey Guardian55Desolace
Demetria61The Scarlet OracleEastern Plaguelands
Drulzegar Skraghook35Desolace
Blue Skeletal Horse1Tirisfal Glades
Brown Skeletal Horse1Tirisfal Glades
Red Skeletal Horse1Tirisfal Glades
Emerald Raptor1Durotar
Enraged Reef Crawler30–32Desolace
Turquoise Raptor1Durotar
Violet Raptor1Durotar
Dire Riding Wolf10Orgrimmar
Scarlet Trooper58–59
Timber Riding Wolf10Orgrimmar
Brown Riding Kodo12Mulgore
Gray Riding Kodo12Mulgore
Riding Striped Frostsaber1Darnassus

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.