Bowser Jr.

Bowser Koopa Jr., known in Japan as Koopa Jr. (not to be confused with Baby Bowser), is the eighth and youngest child of Bowser and the apparent heir of the Dark Land. Dark Bowser's brother. He debuted in Super Mario Sunshine. He acts as the main antagonist of both Super Mario Sunshine and New Super Mario Bros., with parents only playing a minor role in each. He is a playable character in various multiplayer Mario games. Since his debut, he has stolen the spotlight as the main villain from his father in a few Mario Games.