Morton Koopa Jr. (also known as Big Mouth Koopa Jr.) is one of the Koopalings, named after the late talk show host Morton Downey Jr. Although he is the largest of the siblings, Morton isn't as powerful as some of his other large brothers, like Ludwig Von Koopa or Roy Koopa. This may just be due to the fact that he is one of the younger Koopalings, and needs to grow some more. Morton and his brother, Larry Koopa, have a star-shaped birthmark on their heads. He is also the only Koopaling to have a different skin tone rather than the yellow tone the others have.