Bowser

Bowser is a large Koopa who rules as the king of the other Koopas and the main antagonist of most Super Worlds. He owns a very large army of Koopas and other creatures, including his children and various other large monsters such as Bud Bully and Big Boo. He is very powerful physically. He periodically will invade the homeland of either Loogi or Mayro and try to create destruction, though his whole kingdom is somehow stopped by the heroes of the story. His goal is to kidnap leaders of opposing kingdoms and take them down, such as the Shroom Kingdom or Yoshi Village.

In World 2D and Mayro World, Bowser used his eight children to fight with him, but before World 3D they resigned and didn't appear during it. Bowser then used a Cat Bell on himself to become stronger and hired more minions to compensate for this loss.