Morton Koopa Jr.

Morton Koopa Jr. is one of Bowser's eight children and is the sixth oldest Koopaling. Morton's first appearance was in Super Mario Bros. 3 where he along with his siblings (minus Bowser Jr.) aided their father in an attempt to take over the Mushroom World. Morton usurped the sultan of Desert Land and took over, but in the end he was defeated by Mario. Morton appeared again in Super Mario World helping his family in an attempt to take over Dinosaur Land, here he had taken over Donut Plains and attacked Mario by climbing the walls and ceiling of his room and dropping down. Morton was defeated but still helped his family in causing choas in Hotel Mario, Yoshi's Safari and Mario is Missing, but after all these adventures Morton along with the other six original koopalings disappeared. Morton and his bros. and sis reappeared in Mario & Luigi: Superstar Saga were they guarded Bowser's Castle, here Morton learned a new attack, sending shockwaves. Despite this new attack Morton ended up being beaten and has once again disappeared.

Some unused sprites of Morton were found in Super Princess Peach which has spread speculation that the koopalings were going to appear in it. 1

Cartoons
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.

Name Controversy
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 of brown-skinned Morton being adopted into the yellow-skinned Koopa family, for example Jr. 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.