what's the difference between bowser and king koopa
Bowser (クッパ, Kuppa, "Koopa"), or King Koopa, is a fictional character and the main antagonist of Nintendo's Mario franchise. In Japan, the character bears the title of Daimaō (大 魔王, Great Demon King). In the U.S., the character was first referred to as "Bowser, King of the Koopas" and "The sorcerer king" in the instruction manual. Bowser is the leader of the turtle-like Koopa race, and has been the archenemy of Mario since his first appearance, in the 1985 video game Super Mario Bros.