BOWSER JR.

Bowser's only son, who he protects with his life... presumably.

Bowser Jr. is a force to be reckoned with, .. though once one little thing doesn't go right it can throw his whole plan of evil away, and all that's left is a child having a tantrum, which usually Kamek has to deal with, as Bowser's enjoying his time in one of his very many castles within his kingdom and the Mushroom Kingdom.

He was also Bowser's best ally during the events of Super Mario Sunshine, where he donned his infamous mask for the first time, and kicked off as Shadow Mario. He's Shadow Mario, by the way.

Known to be very selfish, though, he'd do anything for his father.