EDIT: It's clear now! TL;DR: Game rolls species first, then villager if there's more than one in the species, making the odds uneven - less possible villagers in a species mean higher chances for those villagers appearing. Thank you to ForbiddenSecrets for helping me realize this!
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So, as I had posted yesterday, I am desperately trying and failing to get Bunnie or Dotty as a Peppy villager for my initial Peppy pick. Given that I have already and very quickly found a Lazy and Normal I like,
I am currently only getting Peppy villagers. However, I not only failed to find Bunnie and Dotty but basically every single bunny, despite there being so many in the Peppy pool.
And so, spreadsheets. I have
450 NMT to use (but will stop when I get Bunnie or Dotty). I will use them in
batches of 50 and will vary daytime and date to see if it has any influence. For now, here's
tickets 1-50, done on Friday afternoon. And look at this data, it's already interesting and has a pattern:
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As you can clearly see, species with only one possible villager in the Peppy group appear A LOT! There are
nine villagers who are the only "Peppy"s of their species, out of 49(!) total, but they make up almost half of the island populations! This is a huge thing, obviously, and rabbits seemingly just don't happen unless the stars perfectly align because there's so many of them. At least not in the afternoon hours.
I will start my second 50-batch once my Switch has recharged and edit it in here once I've collected the data. It's now in the middle of the night here in Germany, so the second 50-batch will happen at around 3am and we'll see how that influences things. Given that I had done all tours at night until now and I'm at this since almost two weeks, I can say: It likely won't change much and I expect the same results based on my experience. But science and all that... also I am horribly frustrated. I just want Bunnie or Dotty...
EDIT: I got Dotty (AAAAAAAA!), so collecting is over for now, but it's pretty sure at this point that ForbiddenSecret has it right and the game rolls species first (all equal chance). And, if there's more than one possible villager for the set personality in that species, it rolls again. Hence, if there's only one villager possible for a species, said villager will appear far more often than if there's eight villagers in a set species and personality type. To summarize: If you want a peppy bunny, be ready to cry. If you want Audie, your chances are pretty good during the initial three houses!
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Will collect more if a set personality happens again on the mystery islands. But this is pretty confirmed.