Koopa 3

Koopa 3 (クッパ3, Kuppa 3) is one of Bowser's alter-ego that appears in Super Mario-kun, he represents the Bowser from Super Mario Bros. 3, as hence not only by the "3" on his belly, but also by the cape Bowser wore in the Japanese box art of Super Mario Bros. 3. The character was created as a way to please the readers that were not able to see the continuation and conclusion of the Super Mario Bros. 3 manga, due to the publisher, Wanpaku Comic, going out of business.

Koopa 3 and his army (they are also from Super Mario Bros. 3) takes over the Star World power-up factory, kidnaps all the stars (but one of them, Sutakichi, manages to escape) and covers the factory with a giant shell: that way, Mario will not be provided with power-ups. When Sutakichi comes back with Mario, Luigi and Yoshi, they rescue the stars and Koopa 3 appears on top of the shell-dome. After presenting himself, Koopa 3 unleashes the Koopa Troop on the heroes, who manage to deal with them. Koopa 3, then, jumps into battle and gets the upper hand, but his finishing blow is stopped by the traveling pod of the Star World Yoshis, who just returned from a vacation. The Yoshis pass Mario a bag full of power-ups, but before he can grab it, Koopa 3 punches away the bag so hard it catches fire. Mario grabs it and the impact turns him into Super Power-Up Mario and, with a powerful blow, defeat Koopa 3 who disappears.