Donkey Kong Jr. and Bowser are the powerhouses of Super Mario Kart. They possess the highest top speed and are incredibly difficult to push around, making them dominant on tracks with long straightaways like Mario Circuit. Their heavy weight also makes them excellent for bumping lighter opponents off the track or into hazards. However, their slow acceleration and wide turning radius require a higher level of skill to manage. You'll need to start your power slides earlier and be more deliberate with your steering. When playing as a heavyweight, focus on maintaining your top speed, utilizing your weight to your advantage, and mastering wide, sweeping power slides. They are best suited for experienced players who can compensate for their handling limitations.
