Morton K Jr
Background information
Debuted In
Feature films
Television programs
Video games Super Mario Bros. 3
Super Mario World
Mario is Missing!
Hotel Mario
Yoshi's Safari
Mario & Luigi: Superstar Saga
New Super Mario Bros. Wii
New Super Mario Bros. 2
New Super Mario Bros. U
New Super Mario Bros. U
New Super Luigi U
Mario and Sonic at the London 2012 Olympic games (Mii Costume)
Mario and Sonic at the Sochi 2014 winter Olympic games (Mii Costume), Mario Kart 8
Super Smash Bros (Wii U/3DS)
Park attractions
Portrayed by
Portrayed by
Voice Lani Minella
Performance model
Designer Shigeru Miyamoto
Honors and awards
Character information
Full name
Other names Big mouth koopa
Age 5
Personality Stupid, serious, insane
Appearance Gray skin, peach skin, two braclets, wacky eyelashes
Home Mushroom Kingdom
Relatives Bowser (Father), Bowser Jr (Brother), Larry Koopa (Younger Brother), Roy Koopa (Older Brother), Wendy O. Koopa (Older Sister), Lemmy Koopa, (Older Brother), Ludwig von Koopa (Older Brother), Iggy Koopa (Older Brother)
Enemies Mario, Luigi, Toad
Likes Beating Mario, Himself
Dislikes Losing, Being defeated
Powers and abilities Strong
Weapons his scepter (in New super Mario bros wii), his hammer (in new super Mario bros U)

Morton Koopa Jr. is the boss of the second world in Super Mario Bros. 3 and Super Mario World respectively. Morton is depicted as the "average" Koopaling, usually possessing no noteworthy special abilities or quirks. He is the second youngest of the Koopalings, which might be hard to believe due his incredible girth.

In the cartoons he was named Big Mouth Koopa, ostensibly because he was more talk than action, and as an homage to Downey, whose entire theme was his admittedly big mouth. His show’s logo was a large open mouth, which Morton/Big Mouth Koopa’s design even resembled. Aptly, in the Super Mario World cartoon, he occasionally served as an announcer[1] (until an annoyed sibling or Koopa would stop him when he talked way too much). There are a few physical differences between Morton and Big Mouth: Morton’s shell is gray (or black in New Super Mario Bros. Wii) and Big Mouth’s is purple; Big Mouth has much larger eyes and purple eyelids; and the star-shaped birthmark (a possible reference to Paul Stanley from the band KISS) on Morton’s face is darker around the cheek, while it’s just one solid color on Big Mouth. Morton Jr. is also much larger than Big Mouth. In the Super Mario World cartoon, Big Mouth’s shell became the same color as in the artwork shown above.

Morton is the only Koopaling to sport a gray shell. Wendy's shell is pink and Roy's formerly; Roy's is currently Purple and the others all have green shells (in the unused Super Princess Peach sprites Wendy was the only Koopaling without a green shell). Morton has a black shell in New Super Mario Bros. Wii.


  1. Super Mario World episodes "Rock TV" and "The Yoshi Shuffle"


Morton Koopa Jr's name is derived from Morton Downey Jr

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