Bowser Jr. is a character that has appeared in plenty of Mario games, with his first appearance being Super Mario Sunshine. He is the only child of Bowser, as the Koopalings are not considered his actual children. Bowser Jr. shares his father's sentiment in kidnapping Princess Peach, as well as putting an end to Mario.
Bowser Jr. looks just like his father when he was a baby, complete with the same color hair (orange), and color scheme. He wears a bandana around his neck with fangs drawn on it, which he usually uses as a mask. His size varies from game to game, with his smallest size being in Super Mario Sunshine.