Submitted by Player2410
"The King of the Koopas. Bowser is Mario's archrival and is always causing trouble in the Mushroom Kingdom.
Bowser commands many underlings, including Koopas, Goombas, Bullet Bills, and Shy Guys. Whenever he sets his sights on the Mushroom Kingdom, his plans are often foiled by Mario and friends.
Bowser is a mighty foe who possesses incredible strength and can even breathe fire."
- Super Mario Official Website