Montgomery Gator (also known as Monty for short) is one of the three secondary antagonists (along with Glamrock Chica and Roxanne Wolf) of Five Nights at Freddy's: Security Breach. He is an animatronic alligator who was brainwashed by Vanny into killing a young boy named Gregory. He is voiced by Cameron Miller.
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.)