Morton Koopa Jr.

Morton Koopa Jr. is the largest and only brown member of the Koopalings, a group composed of seven siblings who lead the Koopa Troop. He is the heaviest and one of the strongest Koopalings.

Super Mario Bros 3
In Super Mario Bros. 3, Morton and his siblings were sent by Bowser to the cause havoc in the Mushroom World. Morton decided to raid Desert Hill; when he got there, he attacked a Toad that was the King's attendent, stole the magic wand and transformed the Desert Hill's King into a Hoopster. Mario and Luigi arrived in Desert Hill to help. After the Bros. go all through the Airship, they fight Morton in his cabin; the Koopaling lost the fight and the Bros. returned the King to normal.