The other three are the Wizard, Guide, and Goblin Tinkerer, as the Guide spawns in a new world, but respawns with the message. The Mechanic is one of four NPCs who don't give the '(NPC name) the (NPC type) has arrived' message.It would appear that the Mechanic and the Goblin Tinkerer are fond of each other, the first characters to show affection in Terraria (excluding the Arms Dealer and Nurse as they generally flirt with all of the opposite sex NPCs).'Thanks! It was just a matter of time before I ended up like the rest of the Skeletons down here.'.'I don't appreciate the way you are looking at me.'All I want is for the switch to make the.What!?'.'(Tavernkeep's Name) offered me a Root Beer, I told him to give it to me in a square cup.'(Tavernkeep must be present).'Hold on, I've almost got wi-fi going down here.'.'Hey, watch where you're going! I was over there a little while ago!'.I DROPPED MY CONTACT.' (A reference to 'Paper Mario and the Thousand Year Door') 'But I was almost done putting blinking lights up here!'.'Oh, you know what this house needs? More blinking lights.' (Might be a reference to a youtube meme where one person goes 'You know what this map needs? Needs more sand.).'Hey, (Character Name), did you just come from ( Goblin Tinkerer Name)'s? Did he say anything about me by chance?' (Goblin Tinkerer must be present).I told him it was for stepping on.' (Arms Dealer must be present) '(Arms Dealer's Name) keeps talking about pressing my pressure plate.'Did you make sure your device is plugged in?' (possibly a reference to 'The IT Crowd').It appears that her wrench can pass through enemies, thus useful against groups. Throws her wrench that acts as a boomerang when an enemy is nearby. Although the Tavernkeep and the Angler are found as well, they are different scenarios. This works the same for the Wizard and the Goblin Tinkerer. Right clicking on the mechanic will unbind her, and after that point it will be possible for the new NPC to move into a house.

One can find a bound mechanic in the Dungeon after defeating Skeletron. The Mechanic is an NPC that sells items such as wrenches, wire cutters, levers, etc.

Terraria 2 mechanics