A Koopa Kid is a character from the Mario Universe who happens to be the child of King Bowser Koopa. As far as known there at least 8 Koopa Kids. The first 7 originally appeared in Super Mario Bros.3 and then they appeared in Super Mario World, Yoshi's Safari, and Mario is Missing.

Their Names are:

Ludwig Von Koopa, Lemmy Koopa, Roy Koopa, Iggy Koopa, Wendy O' Koopa, Morton Koopa Junior, and Larry Koopa,

In Super Mario Sunshine and the Mario Party series Bowser had an eighth child named Bowser Koopa Junior as a replacement character for his siblings.