Metal Knuckles (メタルナックルズ Metaru Nakkuruzu) is a character that appears in the Sonic the Hedgehog series. It is a robot created by Dr. Robotnik in the image of Knuckles the Echidna. It was used during the first World Grand Prix incident to counter Knuckles' participation.
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.)
