Arlo Armadillo is a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. He is a Mobian "western region" armadillo and was a member of the Substitute Freedom Fighters. He was personally trained by Sally Acorn and voiced his confidence in the princess' abilities during his training.
Obviously, don't nominate any human characters. Hybrids like Cheetah or The Lizard are okay, as are shapeshifters with one set animal form (eg Professor McGonagall.)