They all have text like that in the thought bubble when they're thinking. Resetting the game resets villager placement and behaviors. It'll change which villagers are inside (or in a shop/the museum/visiting someone) and outside, and it'll change who has the first thought bubble you see upon loading up. The game picks who will want to move out every morning when Isabelle does her announcements, and it won't change until the next day in-game.
And trust me, in my own experience other villagers are obnoxious about thought bubbles during the move-out period. I once had a day where every villager except the one who was picked to move had thought bubbles. If you're talking with your villagers and improving their friendship, the game doesn't prioritize move-out bubbles over any other random thought a different villager may have.