I have no idea how you all remember I can't think that far back.
I just went digging through my photos and I think it might have been Cally? I dunno though, I've had so many villagers come through town over the years...
In the first town I made back in 2013 it might have been Snake... My memories of the town of Thaumila are hazy, but Snake is the one thing I remember from my debut in Animal Crossing.
In my very first town, it was Freckles or Ava. I can't remember which of them moved first, but I do remember that I cried when I found out :/ And in my main town the first person to move out was Nibbles, glad she's gone