Snow: Steampunker, Pirate and Stylist: ... Terraria - How to unlock Pylons. You'll need to make sure that you place each NPC near another that they like in the correct Biome where possible.

Terraria pylon. You can unlock pylons in Terraria by increasing the happiness of at least two of your NPCs. ... Snow Pylon: Mechanic and Cyborg: Desert Pylon: Dye Trader and Arms Dealer or Painter: ...