Koopa the Quick
Koopa the Quick is the Koopa you talk to and race in Bob-omb Battlefield and Tiny-Huge Island. He also wears sick shoes called the "Koopa Mach 1 sprint shoes" in the second race which he allegedly spent his life savings on.
When KtQ interacts with a bowling ball coming toward him, he will jump over it. Similarly, when KtQ interacts with a bowling ball moving away from him, he'll slow down for it. By placing a clone of a bowling ball facing toward him in certain spots, we can make him jump into cannons and chasms. By placing a clone facing away from him, we can make him slow down at will. This completely wacks him out. Placing both a clone facing toward him and away from him, we can cause him to jump infinitely.