His character model appears lavender in "The Sponge Who Could Fly" and blue in numerous other episodes (e.g. "Something Smells"), and lime-green in "Party Pooper Pants". He also wears round glasses in that episode.
He is shown to be friendly and nice to others most of the time, however, he is very accident-prone, as he is often seen falling and screaming for many reasons.
The running gag was often caused by SpongeBob's antics and naive nature, making him bothered for his obnoxiousness, but is close friends with him.
Fred is sometimes disruptive as shown in "Patty Hype," where he yells at a loud crowd.
Despite his accident-prone nature, Fred shows care towards others.
His name, Fred, was first used in the episode "Patty Hype". When he met up with Tom, they greeted each other with their first names. SpongeBob calls him by this name throughout the episode "My Leg!". In the episode "ChefBob", when he yells "my leg!", Mr. Krabs responds by yelling "Shut up, Fred!". In the episode "SpongeBob's Big Birthday Blowout", when Plankton tries out his torture theme, he has Fred tied up in a leg trap and says "It's a theme party. Get into it. Say it, Fred."
Vincent Waller has also confirmed that the production team uses the name Fred for him.
He is called Clint in "Big Sister Sam."
His first appearance is in the episode "Reef Blower." However, he is barely seen in the episode, as he is in a boat as SpongeBob zooms past him.
He's the most often seen dining at the Krusty Krab. He was one of the first two background characters seen in "Reef Blower," with Harry being the other guy.
Fred's name is revealed in the episode "Patty Hype," where he is advertising the Shell Shack's talking and singing dog.
In Tutor Sauce he appears blue and is seen eating a "Krabby Patty" but just stale buns. He then has to pay extra for "emotional patties."
He is the protagonist in the episode "My Leg!" where he tries not to hurt his leg in the risk of getting it placed by a robotic leg. SpongeBob then tries to keep Fred's leg out of harm's way until he finally reveals that he likes to be in the hospital so he can be with Nurse Bazooka (a nurse he is secretly in love with). So SpongeBob helps Fred by doing many dangerous attempts to purposely hurt his leg, but they just keep failing. When Fred finally ended up in the hospital (after getting run over by the ambulance twice), he sings the song "My Leg is in Love " to show Nurse Bazooka how much he loves her. She enjoys the song and the two end up dating. This episode is Fred's biggest role yet.
In "SpongeBob's Big Birthday Blowout," Fred helps Sandy and the others decorate SpongeBob's house for his birthday party. After he returns, SpongeBob finds the house destroyed and everyone asleep from the party planning. Nevertheless, SpongeBob is excited that his family and friends would do so much for him. SpongeBob lists Fred and the others wonderful friends and how he's grateful to have them. When Patchy the Pirate arrives and sings the birthday song, Fred along with everyone else wakes up and properly celebrate a happy birthday to SpongeBob.
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