Ohhh that would be so cute. Maybe you can even invite one to stay indefinitely, but no more spawn? And if you dismiss them it will allow another dev to come next time it triggers one to spawn.
Teatime with the Devs ~
I know it's a bit late for something like this to be considered, and I didn't see any mention of this from searching, but I was thinking about the way the Travelling Merchant shows up occasionally, and it struck me what else would be cool.
What if rarely (maybe even after Hardmode or...