Sheila is a rare mountain kangaroo[1] who first appeared as a playable character in Spyro: Year of the Dragon. She also makes appearances in Spyro 2: Season of Flame and Spyro: Attack of the Rhynocs, where she serves as a playable character in the former.
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.)