Octonaughty is Eight's supervillain alter-ego and enemy. He has a high-pitched, goofy voice and has a very evil personality. He has a particular dislike for Twenty-Seven and Seventy-Two.
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.)
