Koopa Kid

Koopa Kid is a character from the first seven Mario Party games. He is basically a smaller version of Bowser, sporting the same hairstyle as him. He comes in a Red, Green, and Blue variant.

Koopa Kart series
Koopa Kid appears in the Koopa Kart series in every game starting from Koopa Kart 64, along with Lakitu. He is a middleweight driver in every game he appears in. In Koopa Kart: Double Trouble!!, his partner is Sumo Kong, and their special item is the Giant Banana.