13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Shadowmage59–60Cult of the DamnedEastern Plaguelands
Dark Summoner55–56Cult of the DamnedEastern Plaguelands
Necromancer54–55Cult of the DamnedEastern Plaguelands
Chief Sharptusk Thornmantle5Mulgore
Crypt Fiend53–54Eastern Plaguelands
Crypt Walker55–56Eastern Plaguelands
Crypt Horror57–58Eastern Plaguelands
Crypt Slayer58–59Eastern Plaguelands
Mossflayer Scout57–58Eastern Plaguelands
Mossflayer Shadowhunter58–59Eastern Plaguelands
Mossflayer Cannibal57–59Eastern Plaguelands
Woodsman58–59Eastern Plaguelands
Ranger59–60Eastern Plaguelands
Pathstrider57–58Eastern Plaguelands
Dark Iron Lookout47–48Searing Gorge
Glutton40Razorfen Downs
Ag'tor Bloodfist45Azshara
Magus Rimtori55Azshara
Yeh'kinya41Tanaris
Atal'alarion50Guardian of the IdolThe Temple of Atal'Hakkar
Blood Elf Defender51
Kadrak31The Barrens
Dirania Silvershine8Teldrassil
Iverron5Teldrassil
Haggrum Bloodfist45Azshara
Jediga49Azshara
Umbranse the Spiritspeaker50Winterspring
Plaguehound Runt53–54Eastern Plaguelands
Plaguehound55–56Eastern Plaguelands
Frenzied Plaguehound57–58Eastern Plaguelands
Plaguehound Mastiff43–44
Plaguebat53–55Eastern Plaguelands
Noxious Plaguebat54–56Eastern Plaguelands
Monstrous Plaguebat56–58Eastern Plaguelands
Carrion Grub54–55Eastern Plaguelands
Carrion Devourer56–57Eastern Plaguelands
Living Decay55–56Eastern Plaguelands
Rotting Sludge54–55Eastern Plaguelands
Angered Infernal53
Alexandra Constantine55Gryphon MasterBlasted Lands

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.