Bowser Koopa Junior

Bowser Koopa Junior is a fictional character from the Mario video games from Nintendo. He appears as the youngest of King Bowser Koopa's children. Unlike his siblings he first appeared in Mario Party 3, if not, Super Mario World 2: Yoshi's Island as Baby Bowser. His biggest appearance was in Super Mario Sunshine where he used his alter ego known as Shadow Mario to frame Mario for polluting Isle Delfino. He has also appeared in Mario Party 4, Mario Party 5 and Mario Kart Double Dash.

Bowser Junior, unlike his siblings, does not appear in Mario and Luigi: Superstar Saga.