Kelpy G's appearance is like most octopuses in the show: tall and teal with four legs. He has long, light brown hair and a regular brown mustache. He wears an orange, long-sleeve turtleneck with three red stripes on it. However, in "Smoothe Jazz at Bikini Bottom," he wears leather black shoes that look like SpongeBob's and a long purple dress-shirt.
In the third movie, Kelpy G has darker and curly hair. He also now wears a golden chain around his neck, and a red shirt with white full sleeves. He also has less stress marks on his forehead.
He seems to be a very mellow octopus who believes in peace and tranquility.
Kelpy G has his very own TV show where he performs smooth jazz. He also performs smooth jazz for the Smellies; he calls them "his children," suggesting that he is their leader.
He appears in the episodes "The Thing" and "Smoothe Jazz at Bikini Bottom," both of in which he performs a jazz song on Squidward's TV and performs a concert. In the former, Squidward is annoyed that SpongeBob and Patrick keep interrupting while he is trying to listen to Kelpy G play.
In the latter, Squidward attempts to meet Kelpy G but gets kicked out as SpongeBob plays with the musician.
Even though he met Squidward in "The Thing," he does not seem to recognize him when he meets him again in "Smoothe Jazz at Bikini Bottom."
Kelpy G is shown playing at the Lost City of Atlantic City in The SpongeBob Movie: Sponge on the Run. His performance is what convinces Squidward to go along with the other main characters to find SpongeBob.
Kelpy G changes his clothes in each of his appearances.