13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Thuwd35Skinning TrainerOrgrimmar
Mooranta35Skinning TrainerThunder Bluff
Shadowforge Ambusher43–44Uldaman
Tainted Ooze51–52Felwood
Vile Ooze53Felwood
Ironbeak Owl48–49Felwood
Ironbeak Screecher52–53Felwood
Ironbeak Hunter50–51Felwood
Warpwood Moss Flayer52–53Felwood
Warpwood Shredder53–54Felwood
Dessecus56Felwood
Jadefire Satyr49–50Felwood
Jadefire Rogue50–51Felwood
Jadefire Trickster52–53Felwood
Jadefire Betrayer52–53Felwood
Jadefire Felsworn50–51Felwood
Jadefire Shadowstalker51–52Felwood
Jadefire Hellcaller53–54Felwood
Jaedenar Cultist51–52Felwood
Jaedenar Guardian50–51Felwood
Jaedenar Enforcer52–53Felwood
Jaedenar Adept51–52Felwood
Jaedenar Darkweaver53–54Felwood
Jaedenar Warlock53–54Felwood
Jaedenar Hound50–51Felwood
Jaedenar Hunter52–53Felwood
Toxic Horror53–54Felwood
Infernal Bodyguard53–54Felwood
Infernal Sentry52–53Felwood
Immolatus56Felwood
Irontree Wanderer52–53Felwood
Irontree Stomper52–53Felwood
Withered Protector55–56Felwood
Deadwood Warrior48–49Felwood
Deadwood Gardener48–49Felwood
Deadwood Pathfinder49–50Felwood
Deadwood Den Watcher53–54Felwood
Deadwood Avenger54–55Felwood
Deadwood Shaman53–54Felwood
Wrenix the Wretched20The Barrens

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.