13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Lord Cobrahn20FanglordWailing Caverns
Lord Pythas21FanglordWailing Caverns
Lady Anacondra20Fanglord
Boahn20Druid of the FangThe Barrens
Lord Serpentis21FanglordWailing Caverns
Skum21Wailing Caverns
Disciple of Naralex20Wailing Caverns
Naralex25Wailing Caverns
Serpentbloom Snake1
Wisp1Darnassus
Vrang Wildgore35–48Weaponsmith & ArmorcrafterThe Barrens
Kiknikle32Stylish ClothierThe Barrens
Pizznukle33Leather Armor MerchantThe Barrens
Harb Clawhoof45Kodo MountsMulgore
Reban Freerunner40Pet TrainerMulgore
Laer Stepperunner42Food & DrinkThousand Needles
Kar Stormsinger44Kodo Riding InstructorMulgore
Raene Wolfrunner60Ashenvale
Volcor19Darkshore
Terenthis15Darkshore
Sentinel Selarin20Darkshore
Grimclaw13Darkshore
Ran Bloodtooth30Ashenvale
Bolyun40Pet TrainerAshenvale
Jadenvis Seawatcher51Reagent VendorFeralas
Tharnariun Treetender18Darkshore
Alanndarian Nightsong19Darkshore
Krulmoo Fullmoon42Expert LeatherworkerThe Barrens
Mahani31Expert TailorThe Barrens
Gahroot25ButcherThe Barrens
Tai'jin18Priest TrainerDurotar
Ken'jai10Priest TrainerDurotar
Gruna52Food & DrinkBurning Steppes
Wrathtail Myrmidon20–21Ashenvale
Wrathtail Razortail19–20Ashenvale
Wrathtail Wave Rider18–19Ashenvale
Wrathtail Sea Witch19–20Ashenvale
Wrathtail Sorceress18–19Ashenvale
Mystlash Hydra19–20Ashenvale
Mystlash Flayer23Ashenvale

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.