Piston is a female OC made by BrownFamily1108. There is another Piston, who is a male contestant in Best of the Rest.
BrownFamily1108's OC: Piston is a tomboy who likes racing. She is also Steering Wheel's sister.
Best of the Rest: Piston is naive, being idiotic and silly. He is also a bit clumsy and a bit unintelligent. He likes to be on Goggles' side.