The Prize Ball Guardian are the enhanced and modified versions of Gumball Guardians and are the protectors and mobile form of Candy Kingdom. The guardian is introduced in the episode "Graybles 1000+" where it takes in Cuber mistaking him for Starchy. Not much is known about them except that they are a guardian of the Candy Kingdom and also its mobile form.
The guardian is seemingly an enhanced and futuristic form of the Gumball Guardians. It has a cuboid-shaped head, which contains the citizens of the Candy Kingdom in prize containers, hence the name, Prize Ball Guardian. It is very tall, has a dark pink body color, and also carries a boomerang/gun at their waist.