They are all so cute but I’d pick either Mitzi because I love cats, or Poppy. I used to not care much for Mitzi’s design (her eyes) and never paid attention to Poppy, but they’re among the bunch of villagers whose designs have grown on me tremendously as I read threads and see people’s screenshots. Since this is your island not mine, I’d say go for whichever you have stronger feelings for their design.
I’d choose Mitzi. Her design is cool and I hardly ever see people talking about her, so I think she will also feel fun and different on your island. Poppy is also very cute of course.
Poppy for sure in my opinion. She's a sweetheart and her color is fantastic. Plus her house is really awesome as well! I'm pretty biased though as Poppy is literally my favorite squirrel villager.
based off of what you’ve said, you seem to like poppy the most out of the 3, so i’d go with her! and plus, she’s absolutely adorable and would be great to have around, but really, you can’t go wrong with any of them
