Goofy Goober is a large, light tan peanut character with light green arms and legs. He wears a Southern hat, a red bow tie with yellow dots, and Mickey Mouse-like gloves. He also holds a lollipop. He has a single tooth, two large dimples on his cheeks, and a nose resembling Pinocchio's. The costume also has a few gadgets hidden inside such as a long spring with a pointing finger on the end and a vaccum.
In "The Goofy Newbie" it is revealed that Goofy Goober is really a security fish dressed up as a peanut. He is a large light purple muscular fish with yellow hair and dark purple lips. He has three freckles on the right side under his mouth. He wears a purple suit with a white dress shirt and a red necktie along with black shoes and green shades.
His undisguised form and the bald bodyguard kick SpongeBob out of the Art Museum.
After being mentioned and referenced in many episodes throughout the series, Goofy Goober finally made his first physical appearance in the show as a cameo. He is shown as a waiter at Goofy Goober's Ice Cream Party Boat in this episode.
"The Goofy Newbie"
He appears in the beginning of the episode handing balloons to the children at Goofy Goober's Ice Cream Party Boat. Squidina then calls him to kick Patrick out since he keeps trying samples instead of actually buying ice cream. Goofy Goober takes his disguise off revealing his true form as a security guard and uses an ice cream scooper to scoop Patrick out of the ice cream parlor.
On his first day of working at the Goofy Goober's Ice Cream Party Boat, Patrick temporarily takes over Goofy Goober's job by dressing up as the peanut himself. He eventually uses the costume to steal ice cream by sucking it up with the hidden vaccum in the costume.
According to Vincent Waller, Paramount Pictures formerly did not allow any movie-exclusive content to be used in the SpongeBob SquarePants series from 2005 to 2014. This is why Goofy Goober did not make a physical appearance in an episode until "Patnocchio" (not counting his undisguised form). He recalled, "We couldn't even use images of Goofy Goober from the movie back then."
This makes him the first character from the movie to fully appear in the series.