Paige
Pixel Pirate
Rather than just making each NPC room exactly the same (rather boring if you ask me), certain NPCs could require different furnishings in their houses For example a Piggy Bank could be made out of clay and the Merchant would require a Piggy Bank in the room to move in. Another example is the Hair Stylist could require Mannequins, or a new item could be added like a Head Mannequin. The Traveling Merchant could require minecart rails nearby, The Angler a fish other than a Bass on the wall (would require you to do a bit of fishing considering Bass are the most common fish) or just two different types of fish, The Dryad a boss trophy (most likely would require killing a boss more than once), the Party Girl a banner of each color, etc.
EDIT: Chadwick (http://forums.terraria.org/index.php?members/chadwick.1291/) pointed out that the whole requiring certain furnishings idea disallows creative freedom in many aspects, so rather than having it be a requirement, these furnishings could simply lower the prices of the merchant's wares, get you better loot from quests, and give you better sell prices.
EDIT: Chadwick (http://forums.terraria.org/index.php?members/chadwick.1291/) pointed out that the whole requiring certain furnishings idea disallows creative freedom in many aspects, so rather than having it be a requirement, these furnishings could simply lower the prices of the merchant's wares, get you better loot from quests, and give you better sell prices.
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