Incidental K1

Incidental K1 is a kid fish who first appears as the secondary antagonist of the episode "Friend or Foe."

Names

 * In "Penny Foolish," his name is Billy.

Description
He is a light purple fish with purple fins, faded-blue lips, and wears a red shirt and a white and blue cap.

Personality
He likes to bully innocents with no apparent reason behind his actions, as seen in the flashbacks from his grade-school years and when he is shown as a delinquent teenager using ketchup as a weapon.

"Friend or Foe"
He is shown as the leader of a group of class bullies at Poseidon Elementary School who constantly makes fun of about his clothes and calls him "Rag Boy" and also bullies  for his small size and brilliant intelligence. He is also the first ever person to try a Krabby Patty. When he and the other kids try it, they love it because of its flavor and how they can actually eat it and hold it down. This makes them warm up to Mr. Krabs.

"Picture Day"
He is among a small mob of troublemaking teenagers who run rampant through Bikini Bottom, attacking people with ketchup.

"Penny Foolish"
He is seen in his mom's car, commenting over Mr. Krabs blabbering in his car.

"The Clash of Triton"
He appears as a baseball player at the baseball field.

"Don't Look Now"
He is one of the kids who stars in the horror film Fisherman 4: Attack of the Hook.

"Lost and Found"
He is seen running away from school after hearing 's kazoo playing in a flashback.

"Whale Watching"
He appears in Dylan's surface party.

"Stormy Weather"
SpongeBob gives him his leaf blower.

"Plankton's Intern"
He appears as one of the Chum Bucket candidates.

Picture Day Disaster
He appears on the title screen and during the gameplay.

Nicktoons MLB
He appears in the Bikini Bottom field.

Trivia

 * He is the first child bully to be shown in the series.
 * Despite being a teenager in "Picture Day," he does not look nor sound any different than he does as a first grader in "Friend or Foe."