I like the idea. It seems kind of nice to have a wraith running a toy shop, ironically. I'm thinking about those generic stories I've heard where the kid is terrified of some old guy who seems cranky and evil but he actually turns out nice... It's finally a somewhat-humanoid creature, on top of that.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.