Demolitionist

The Demolitionist is an NPC vendor that will spawn once the following criteria have been met:
 * There is an empty house.
 * You have one of the Explosive Consumables in your inventory.

Once the Demolitionist has moved into a house, he will sell the following:

The Demolitionist's appearance seems to be based on dwarves from many games, films and works of literature. He is significantly shorter than other NPCs and has a beard. Furthermore, his mining helmet, lantern, and the fact that he sells explosives fits the trope of dwarves preferring underground environments. He and the Arms Dealer also seem to have a rivalry.

Quotes
"Dynamite, my own special cure-all for what ails ya."

"Explosives are da' bomb these days. Buy some now!"

"Why purify the world when you can just blow it up?"

"It's a good day to die!"

"I'm sure the nurse will help you if you accidentally lose a limb to these."

"I wonder what happens if I... (BOOM!)... Oh, sorry, did you need that leg?"

"Even the gun dealer wants what I'm selling!"