Koopa Jr., known as クッパJr. (Kuppa Jr.) in Japanese, is the mischievous son of Bowser, the main antagonist of the Mario series. In the Super Smash Bros. series (Dairantou Smash Bros.), Koopa Jr. is a playable fighter, utilizing his Junior Clown Car and a variety of gadgets to battle opponents. He is characterized by his youthful arrogance and loyalty to his father, often acting as Bowser's accomplice in schemes against Mario and his friends.