I am figuring out who are my 3 villagers that wanted to move onto my island? I traveled to mystery island 2 times, but talked to no one. Nook one day told me 3 people wanted to come live on my island and gave me 3 lands to build. I so worried they are going to be the 3 that I met, or 3 random villagers. I am trying to earn more miles to visit more island to invite villagers that I like such that I don't get those less desirable ones. I so far traveled to 2 more islands but still talked to nobody.
I don't know if this could be done, but that's what I am working on.... anything to earn more miles.
I believe you are safe to continue visiting islands and talking to villagers. Until you actually plot the house spaces down on your island, the villagers aren't set. If you do this without inviting any islanders, you will indeed get 3 randoms