I wouldn't say I dislike any of the elephant designs--I like the elephants as a species too much, to use a phrase I've picked up recently they're "shaped like a friend". Very cute base design~
That said, Axel and Dizzy don't make much of an impression beyond being basic, cute cartoon elephants. Paolo as well, though having seen some of the other villagers with the same big rectangle 'brows, he doesn't look too bad.
Big Top has a very niche design. I'm not a huge fan of the sentai themed villagers myself, but I'd prefer him over Agent S. I love the idea of a mammoth themed villager (I wonder if Tucker ever visits the fossil wing of the museum...) and his tusks are very cool, but I don't really like the expression of Tucker's eyes.
Opal's design is again, a little basic, but fine. Ellie to me looks a lot like Maple, so while her design is also pretty basic, it works and her slightly worried facial expression is endearing.
Eloise I prefer over Opal for some reason. They've both got the front-hair and eyelashes, but I guess I like Eloise's colors better, and to me she seems mischievous. Margie has a bolder color scheme, fitting for a 'circus elephant' motif, and it makes it seem like she has a more bombastic personality. Tia is a teapot, so I can't help but like her!
Chai is also associated with tea, but I think I like her over Tia...I just think it's funny to imagine her balancing a teacup on her head all day long, or to think that maybe she's completely unaware of it. And her color is very cute. Cyd is a villager I'm determined to host at some point! I overlooked him when New Horizons came out, but the more I look at his design the more I appreciate the little details. I like his asymmetrical mohawk, his eye expression, his cocky smile, and his distinctive green-painted nails! So for me, Cyd is the favorite <3