I seem to recall it being stated that the 1.2 update includes a number of new, friendly NPCs. What are they, and what are the requirements for each to appear?
Dye Trader will move in when:
- Any material used to make dye is in the player's inventory, such as the yellow marigold.
Party Girl will move in when:
- You have at least 8 NPCs (Note: There is a 2% chance for the Party girl to spawn each morning, so it can take a while for her to arrive.)
Steampunker will move in when:
- The player has killed any Hard Mode boss and there is a suitable house for her.
Painter will move in when:
- The player has obtained at least 4 NPCs.
Witch Doctor will move in when:
- The player kills The Queen Bee.
Pirate will move in when:
- The player fights the pirates by using a treasure map obtained by killing hard-mode sea monsters.
Cyborg will move in when:
- The player kills Plantera.
Truffle will move in when:
- The player has a house with Mushroom Furniture (Mushroom Workbench/Mushroom Doors/Mushroom Chair) in a surface Mushroom Biome.
Note: Just like with any NPC, the player must have an empty and valid house available.