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An NPC or Non-Player Character is an automated character that provides a service to players. Most NPCs are vendors, providing items in exchange for coins, and vice versa. Exceptions are the Guide, who provides information, the Nurse, who doesn't sell items, but instead provides health restoration in exchange for coins. A player can utilize NPCs by standing near them and right-clicking on them.

NPCs have randomly generated names as of 1.1.

Conditions

For all but two of the 12 NPCs (excluding the Old Man and the Guide at the start of the map) to spawn you must build them a home, which consists of a light source, a flat surface item, a comfort item, as well as meeting one other unique requirement for each NPC, which are listed below (more information in the home page). This doesn't exclude the guide, who still requires the same to respawn. NPCs will not spawn if a Goblin Army is present, or if your house is on an area affected by corruption.

List of NPCs (As of 1.1.2)

	Guide	The Guide is gained at the start of any map. He is the first NPC you will have. The Guide gives advice that can prevent new players from getting stuck. He also tells you which items can be crafted with certain materials.
	Merchant	A Merchant is acquired when all players combined have a combined wealth of more than 50 in their inventory. He sells various items, one of which, is a Mining Helmet. Since the 1.1 update, you can no longer spawn more than 1 Merchant. He sells Piggy Banks, Mining Helmets, Iron Anvils, Copper Pickaxe and Copper Axes, Torches, Lesser Mana and Lesser Health Potions, Arrows, Shuriken, and at night, Glowsticks.
	Nurse	A Nurse is acquired when your character has found and used a Heart Crystal. She heals you for a certain price depending of your health. Note - She can be obtained on a world so long as someone has previously used a Heart Crystal. In other words, It doesn't need to be consumed on that world. Since the 1.1 update, you can no longer spawn more than 1 Nurse. She doesn't sell anything.
	Demolitionist	The Demolitionist is acquired when you have an Explosive (i.e. Bombs, Dynamite etc.) in your inventory. He sells Grenades, Bombs and Dynamite to the Player.
	Arms Dealer	The Arms Dealer is acquired when you have a Gun in your inventory. He sells guns and ammo to the Player. He sells Musket Balls, Flintlock Pistols, and Minisharks.
	Dryad	The Dryad is acquired after you have beaten a Boss in that world. You can beat any boss in order to get the Dryad.
	Old Man	The Old Man is found at the entrance to the Dungeon. He will be freed as you defeat his captor: Skeletron. After defeating Skeletron he will arrive at your house as the Clothier.
	Clothier	The Clothier is acquired after defeating Skeletron. He sells Vanity items and Black Dye.
	Mechanic	The Mechanic is found bound within the Dungeon. You must right click her to unbind her. She sells Wrenches, Wire Cutters, Levers, Switches, and every type of pressure plate.
	Goblin Tinkerer	The Goblin Tinkerer is found bound within the Dungeon, the Underground Jungle, or simply Underground after defeating the Goblin Army. You must right click him to unbind him. He sells Rocket Boots, Rulers, the Tinkerer's Workshop, the Grappling Hook, the Toolbelt, and Spiky Balls.
	Wizard	The Wizard is found bound Underground after you have beaten the Wall of Flesh. He can also be found bound in the Dungeon You must right click him to unbind him. He sells Crystal Balls, Ice Rods, Greater Mana Potions, Bells, Harps, Spell Tomes and Music Boxes.
	Santa Claus	Santa Claus is acquired when you have defeated the Frost Legion. (Will now die if your computer date is past Dec. 31 and will not respawn.)

Notes

NPCs can only jump 3 blocks high.
The Guide is an NPC that spawns upon creating a new world. He will move into the first house you build.
If a house occupied by an NPC is destroyed, the NPC will move out, but will walk around in the same area and will no longer stay still at night, until the house is restored or a new one is built elsewhere.
When night begins, NPCs will walk into their house and remain there until dawn, at which point they will walk around again and go through doors.
All NPCs have 250 HP and can take damage from enemies, (with exception of the Old Man) though their health automatically regenerates over time, and a killed NPC will respawn and move back into its house (provided it is still standing with all requirements met).
Items sold to NPCs (as of the 1.0.5 update) may be re-purchasable at the same price until the player closes the shop screen.
Currently, the Guide is the only NPC you can damage and kill with weapons, you can do this by equipping the Guide Voodoo Doll in an accessory slot. Other NPCs can only be damaged and killed with lava, boulders, traps, or monsters.
NPCs will automatically teleport back to their home if they have just spawned or if it is night-time and they are unable to get back to their house. However, if you can see their house OR the NPC they will not teleport to it.
With the 1.1 update, all NPCs (excluding the Old Man and Santa Claus) now have randomly generated names. Many of the names are references to well-known characters from Legend, or in some cases Deities, or Higher Powers of some Religions. Some are even references to well-known games or films.
If you leave a bound NPC without rescuing him or her, the NPC will not be at the same location the next time you visit it.
All female NPCs become irritable during a blood moon, snapping at the player when being talked to.
NPCs can live in houses made from Demonite bricks.
You can respawn Santa Claus by setting the date of your computer to 15-31 December.
To choose which room to put your NPCs in you must press esc, then press the little house symbol above your armor. Then you can drag the portrait of the NPC to the room where you wish to place them.

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NPC

Conditions

List of NPCs (As of 1.1.2)

Notes

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