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If you close the lot immediately without saving, then open it again, usually the NPC is gone and leaves no character data behind. You can use your character folder to make sure that this is the case - as long as it's empty, you're golden; and if you quit without saving, it's as if the character data was never there to start with.
This is one reason to back up your empty hoods every time you work on them - if you accidentally save with an NPC on a lot, it's not an empty neighborhood anymore, and if that's important, you'll have to revert to the most recent backup.
Any NPC generator is likely to do this, so - bars, DJ booths, restaurant stoves and podia, cash registers, coffee stands, any of that.
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