If what I think is true, we haven't gotten a new line ever since the 'Shhh!' voice line released, I'm not counting the Guest as you can't tell what he's saying, and the kids have gone even LONGER without getting new lines. They just had the original lines they got and nothing new. So I have two things to ask here and I'm sure quite a few will agree
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Record new lines for both kids and neighbors.
There's quite a few things that kids can ping that don't have voicelines and other things that I think deserve voicelines in general, perhaps some event related stuff. -
Have the lines NOT be generic (give personality).
These characters in SN aren't just characters that show up once, they have a personality. Have their voice lines reflect it with having their own way of saying things and perhaps even changing the script up a bit. Like I can imagine Detective would exclaim 'Get into the basement quick!' nervously when he opens the basement while Leader says 'Now's our chance, let's save Nicky!' demonstrating their personalities and it's better than a simple 'The basement's open!' or something like that.