When they are killed they are gone until the next day. NPCs aren't invincible, though it isn't the end of the world if they die.
![map viewer terraria find npc map viewer terraria find npc](https://i.redd.it/vzdchqnozcy41.png)
If we break down the types of NPCs in Terraria, there are: The rest require certain conditions to be met to unlock. Only the guide will be in your town at the start of the game. There areĀ 28 NPCs and 3 pets in Terraria. Moving in requirements for Terraria NPCs |.This Terraria NPCs guide details how many NPCs are in Terraria, and how to unlock NPCs in both pre-Hardmode and Hardmode.
![map viewer terraria find npc map viewer terraria find npc](https://cdn.windowsreport.com/wp-content/uploads/2020/04/terraria-TEdit-e1587305277288.jpg)
They each with their own set of requirements that you need to fulfil before they move into your town. So yeah, there are quite a few different NPCs out there.