Hmm the elephants are underrated, in my opinion, as are the anteaters! I love all of the anteaters, they're so cute! You never see someone having them as their dreamies. Pango is one of mine and I can't wait to get her ^_^Those would probably be my main two to be honest. I also quite like the frogs and goats, too :3
Koalas and gorillas, definitely. Also the dogs to an extent-- people seem to really like Lucky, and a few of the others have their fans, but a lot of them get really overlooked. The penguins as well. I love most of the penguins but I recently learned that a lot of people really dislike them.