Bowser Jr.

Bowser Junior is the son of the brutish King of the Koopas, Bowser. First appearing in Super Mario Sunshine, he has turned up in many Mario titles since to help his father take over the Mushroom Kingdom.

Overview
Bowser Jr. is a vicious and mischievous little brat who takes after his father in all the wrong ways. Since his debut in Super Mario Sunshine, he has taken part in many of his father's major world domination schemes, commanding hordes of Bowser's minions and, oftentimes, creating and operating giant machines that he can use to battle Mario. If there's anything that sets Junior apart from his father, its his creativity: in most of his appearances, he takes control of giant robots or other contraptions when battling Mario; he doesn't seem to possess his father's fiery breath or have the same level of magical ability. He is, of course, very tenacious and doesn't give up easily.

Abilities
Junior isn't as strong as his father and cannot breathe fire, so he's no match for Mario in a fair fight. He does, however, possess some significant technical prowess as he is seen commanding at least one giant robot in each of his major game appearances.