Bowser is a popular character in the Mario game series, he is a large, spiky, fire-breathing villain who is the arch-enemy of Mario. Bowser is often portrayed as the leader of the Koopa Troop, a group of turtle-like creatures. He is also known as King Koopa and his mission is to kidnap Princess Peach and take over the Mushroom Kingdom.

Bowser has a variety of attacks and abilities, including throwing hammers and fireballs, as well as having the ability to fly and breathe fire. He is usually fought at the end of a level or a castle, where he is often protected by various obstacles and minions. Mario's goal is to defeat Bowser and save Princess Peach from his clutches. 

Bowser's character has become an iconic part of the Mario game franchise and has appeared in hundreds of games, spin-offs, and merchandise items.