Bowser is the supreme leader of the Koopa Troop, King of the Koopas, and the arch-nemesis of Mario. Repeatedly, he tries to kidnap Princess Peach and take over the Mushroom Kingdom. The Koopa King has attempted to conquer the entire Mushroom World many times, as well as the entire universe.

Since his debut, Bowser has been in almost every Mario game, appearing in main stream, spin-offs and crossover games. Bowser is one of video games' most recognizable villains, and is known for his aggressive nature. Besides being a primary villain, Bowser is also at times an antihero, usually in the Mario RPGs, excluding Paper Mario, where he is the main villain and final boss.