Larry has a yellow skin and a green head. His eyes are blue and oval. His hair is light blue. He has small but sharp claws on his fingers and toes. He has a light blue shell on his back and a pink snout. He also has, like the other Koopalings, a padded stomach and padded feet.
In the game, Larry is the boss of Crescent Coast and rides in a sun-shaped submarine. The sun machine has a yellow coloured body with blue half-spherical shaped window in the centre. Mario had to shoot at the nose to open up the submarine and expose Larry. Larry then zooms around the screen while Mario starts shooting at Larry. After a lot of hits, Larry is defeated and floats up to the surface, holding up a white flag to admit defeat.