Wikia

There are various types of non player characters (NPCs) this list will describe what each NPC function is, and other associated abilities.

Type	Description
Class Trainers	Trains player classes
Tradeskill Masters	Trains players in tradeskills
NPCs	A non player character (eg Guards, Enemies, Quest Givers)
Merchant	Buys and Sells items to the player
Guard (NPC)	Will attack any hostile NPC within range
Realm Guard	Will attack only enemy players within range
Channeler	Teleports a player to a selected area
Hastener	Gives a temporary, low level (despite in game symbol) speed buff
Vault Keeper	Allows access to the players storage vault.
Smith	Repairs condition of players items
Enchanter (NPC)	Enchants players items with magical bonus
Stable Master	Provides players with a Taxi Horse to take them to other Stable Masters
Dock Master	Provides players with a Taxi Boat to take them to other Dock Masters
Consignment Merchant	Sells items for a player at listed prices, and placed outside of player house
Market Explorer	Allows players to view all consignment merchants throughout their server
Mission Master	Gives several different quest to the player (only in RvR)

NPC Types