Incidental K4

Incidental K4 is one of Incidental K1's friends who also attended Poseidon Elementary School with and. He first appears in the episode "Friend or Foe."

Names

 * In "Friend or Foe," he is named Big Johnny.

Description
He is a short lime green kid fish, with dark green fins, orange lips, and acne who wears a white T-shirt, and light blue shorts.

On newer seasons, his feet are completely black, he doesn't have acne and his color palette is inconsistent.

"Friend or Foe"
When first introduced, he is a schoolmate of Mr. Krabs and Plankton at Poseidon Elementary. He is also one of the various friends of the school bully, Incidental K1, who teased and tormented and  as children. According to his friends, he will eat anything. He was the first to try Plankton's chumburger, but when he eats it, he spits it out due to its toxic flavor.

"A Life in a Day"
He makes a cameo at Goo Lagoon, where he is making a sandcastle alongside Incidental 67KID.

"Lost and Found"
Incidental K4 appears in 's childhood flashback where he jumps out from the top of the Bikini Bottom School after hearing Squidward play the kazoo badly.

"Stuck on the Roof"
After fails to save the Krabby Patty from falling, it lands on the floor and splatters ketchup everywhere like blood, which makes Incidental K4 cry and leave with Incidental 49.

"Old Man Patrick"
He appears at the beginning of the episode where he is afraid of jumping in the pool, so he stays on the trampoline until the chubby customer jumps behind him and due to the latter's weight, Incidental K4 flies out to the sky. He is not seen landing.

"The Goofy Newbie"
He appears as a customer at Goofy Goober's Ice Cream Party Boat.

Trivia

 * Between "A Life in a Day" and "Lost and Found," he was absent in the series for 9 years.