Arms Dealer

The Arms Dealer is an NPC vendor that will spawn once the following criteria have been met:
 * There is an empty house.
 * You have acquired a gun (the gun must be in your inventory, not just stored in a chest somewhere).

The easiest gun to acquire for this purpose is the Musket, which can be obtained by destroying a Shadow Orb.

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

Quotes

 * "Keep your hands off my gun, buddy!"
 * "Don't bother with that firework vendor, I've got all you need right here." (Only if Demolitionist is present.)
 * "I see you're eyeballin' the Minishark.. You really don't want to know how it was made."
 * "Make it quick! I've got a date with the nurse in an hour." (Only if Nurse is present.)
 * "That dryad is a looker. Too bad she's such a prude." (Only if Dryad is present.)