I don't really think the Animal Crossing personalities line up with MBTI types very well. The best way I can think to show you what I mean is that my roleplay partner (who has done a ton of research and reading about MBTI) and I been MBTI typing all our original characters and Animal Crossing personality typing as well. They don't line up at all. I have an ENTP snooty, an INFJ snooty, an ISTJ normal, an ISFJ cranky, an ENFP peppy, an ENTP smug and an ESTP smug
I could see a correlation though, I think smug might correlate with tertiary Fe and Normal with dominant Si, peppy seems to be kinda FP? Like the high up Se or Ne without the tertiary Fe, hm..... yeah I don't think it works.