Rabbits - way too many of them any they don't even look like actual rabbits. Their ears are strange. Even Zipper looks more like a genuine rabbit and he's a costume (not that i like Zipper). There are some Rabbits I don't dislike, but the general design is bad in my opinion.
I'm gonna be basic and say lions, gorillas, kangaroos and hippos. I do not like any of their designs (though I did have Harry for a while and he certainly grew on me - I guess we can learn to appreciate any villager... which is why I won't kick one of these out immediately if they would move to my island)!
^ This response right here!
The only reason I heavily dislike the kangaroos is because of their “mechanical” babies who have the same expressions and have no interactions/mentioning whatsoever. I can even excuse the male ones (Rooney and Walt aren’t the worst in my book!)
Large apes are amazing! I wish that they were better represented in Animal Crossing. I'd like to see a redesign that actually makes them justice but that's probably hoping for to much.
Probably the birds. Twiggy is nice, but none of the others really appeal to me. Gorillas may be unfortunate looking, but I really like their designs (Hans, Boone, Louie) Anteaters and sheep are pretty low for me.