Coming back to the Corruption Toy Shop idea, I was looking around the wiki recently and I noticed an interesting thing.
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This is an official card from the Terraria's Collector's Editon. This information could make him a good candidate for the shop, it gives him a connection to the corruption, he's human like and most importantly it connects him to the Crimson Barkeep. According to Terraria lore Face Monsters were a sacrafice to the Crimson so you could say that Wraiths are a sacrafice to the Corruption. He doesn't have a connection to making stuff like my other examples but Face Monsters don't have a connection to cooking so I don't think it's necessary.