Morton Koopa Jr.
Morton Koopa, Jr. is one of the eight children of King Bowser.
Morton is the boss of Desert Land and the Donut Plains in both Super Mario Bros. 3 and Super Mario World, respectively. In both games, he fights like his brother Roy.
In the cartoons he was named Big Mouth Koopa, ostensibly because he was more talk than action. Aptly, in the Super Mario World cartoon, he occasionally served as an announcer. There are a few physical differences between Morton and Big Mouth: Morton's shell is gray and Big Mouth's is purple; Big Mouth has much larger eyes and purple eyelids; and the star-shaped birthmark on Morton's face is darker around the cheek, while it's just one solid color on Big Mouth. Big Mouth's rambles were given by Dan Hennessey.
The fact that Morton's name ends in a "Jr." has made some fans wonder if Bowser's actual first name is "Morton" as well. This is not the case. This curious nominal suffix is merely a nod to Morton's namesake, just as the "von" in Ludwig von Koopa is a nod to Beethoven. Any speculation into other possibilities — brown-skinned Morton being adopted into the yellow-skinned Koopa family, for example — has no basis in Nintendo canon, as Nintendo has never opined on the issue, one way or the other. In fact, the editors of the magazine Nintendo Power once claimed that when they asked Bowser why Morton Koopa was called "Jr.", he responded by pelting them with Bob-ombs
