13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Rotting Behemoth55–56Western Plaguelands
Decaying Horror56–57Western Plaguelands
Diseased Black Bear51–52Western Plaguelands
Diseased Grizzly55–56Western Plaguelands
Diseased Wolf53–54Western Plaguelands
Carrion Lurker52–53Western Plaguelands
Venom Mist Lurker50–51Western Plaguelands
Plague Lurker54–55Western Plaguelands
Scarlet Mage55–56Western Plaguelands
Scarlet Sentinel55–56Western Plaguelands
Scarlet Hunter52–53Western Plaguelands
Scarlet Magus56–57Western Plaguelands
Scarlet Knight54–55Western Plaguelands
Scarlet Paladin55–56Western Plaguelands
Scarlet Invoker53–54Western Plaguelands
Scarlet Cavalier56–58Western Plaguelands
Scarlet Judge60Western Plaguelands
Scarlet Interrogator61Western Plaguelands
Scarlet High Clerist63Western Plaguelands
Grand Inquisitor Isillien63
Scarlet Executioner60Western Plaguelands
Highlord Taelan Fordring63Highlord of the Scarlet CrusadeWestern Plaguelands
Foreman Jerris62Western Plaguelands
Foreman Marcrid58Western Plaguelands
High Protector Tarsen59Western Plaguelands
High Protector Lorik61Western Plaguelands
Foulmane52Western Plaguelands
Lord Maldazzar56Western Plaguelands
Putridius58Western Plaguelands
The Husk62Western Plaguelands
Araj the Summoner61Western Plaguelands
Darkmaster Gandling61Scholomance
High Priest Thel'danis62Western Plaguelands
Tirion Fordring61Eastern Plaguelands
Ravenclaw Raider12–13Silverpine Forest
Ravenclaw Slave11–12Silverpine Forest
Dalaran Apprentice13–14Silverpine Forest
Ravenclaw Servant13–14Silverpine Forest
Ravenclaw Champion14–15Silverpine Forest
Hand of Ravenclaw15–16Silverpine Forest

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.