The Choppa is a normal creature that will spawn, they are called the Choppa because of their spinning blades.
Min/Max Speed: 5/10
They move very simply, if far enough from the player, they will move straight on at a slow speed, if they get close enough, they will charge. Charging means they cannot change their direction, but move at a much faster speed (Faster then the player)
Sometimes a Choppa will spawn with a Thief on it's back, which will drop off if the Choppa dies.