Jason and Company
- The Cassandra: Caught saying so many lied that when he is telling the truth (even if it's too weird to believe) only his best friend believes him.
- Crying Wolf: He does this quite literally.
- Determinator: Flew to Los Angeles with Kaylee to confront Marty to get his paper back is the only way to convince his parents that he's telling the truth.
- Hero with Bad Publicity: He's lied to a lot of people, and struggles to gain their trust. (Not so those who have an ax to grind with Marty Wolf.)
- Heroic BSoD: Jason breaks down when he tried everything to stop Mary and admitting the truth only too make matters worse and in the brink of giving up.Kaylee: You know what the worst part of this whole thing is? Wolf is just going to keep getting away with it. He treats all these people like dirt, and no one has the guts to stand up to him.Jason: Forget it, Kaylee.Kaylee: I can't forget it. It just makes me sick that your parents are never gonna know that you wrote that story.Jason: What are we supposed to do?. My parents are gonna be here in the morning! We tried everything. It would take an army to get Wolf to admit the truth.
- Innocent Blue Eyes: It ain't Jason Shepherd without Frankie Muniz's blue eyes!
- Jerk with a Heart of Gold: He may be a chronic liar, but he's also kind and helpful.
- Keet: Sometimes Jason can be this, especially when he drank too much Coca-Cola.Kaylee: What's with the Cokes?Jason: The machine, it's rigged. They're free. (hysterically laughing) They're free!
- Laser-Guided Karma: Jason the chronic liar gets busted by his English teacher at the beginning of the film.
- Late for School: After Jerk Jock Bret takes Jasons skateboard, he goes rushing on foot to school only for Ms. Phyllis Caldwell to shut the door in front of him. Same when he took a bicycle when he needs to go back to school to submit his handwritten essay.
- No Escape but Down: After Martys Villainous Breakdown, the only way for Jason to escape from the chase is to jump off the 4-foot building. Fortunately, he landed safely on an airbag.
- Pragmatic Hero: Not above using cunning and manipulation to get what he wants, but he does know that lying is bad, and is making an active effort to stop doing it by the end.
- The Trickster: Hes accountable for the pranks and mishaps Marty fell victim into.
- "Well Done, Son!" Guy: Wants nothing more than to get his parents' trust back. He does.Harry Shepherd: You did all this just to prove you weren't lying?Jason: I wanted to earn your trust back, Dad.Harry Shepherd: You've earned it, buddy. You've earned it.
Jason's best friend, who tags along with him to Hollywood to get his credibility back.
- Genki Girl: Kaylee really has an upbeat personality.
- Girl Friday: To Jason.
- Nice Girl: Very polite and kind, especially towards Jason.
- Platonic Life-Partners: Doesn't really have any visible romantic feelings for Jason, she's just his best friend.
- The Straight Man: Acts as this to Jason, showing him how outrageous some of his ideas are.
Michael Bryan French & Christine TucciJason's parents, who are both fed up with his lies. The one time he tries to tell the truth, they don't believe him.
- Good Parents: They really would like Jason to not be such a chronic liar, though.
- Small Role, Big Impact: They don't appear much in the film, but Harry chastising Jason about his lying habit by saying that "making up stories seems to be [his] God given talent," is what inspires him to write "Big Fat Liar."
Marty Wolf Pictures
- 0% Approval Rating: NO ONE likes this guy. Even the kids. And with valid reason.
- Bad Boss: Treats all of his employees like dirt.
- Berserk Button: Tricking him, making a fool out of him (which is pretty easy, but still), all that.
- Big Bad
- Butt-Monkey: A big target of Jason's mishaps.
- Cloud Cuckoo Lander: Marty is typically one especially when he has Mr. Funnybones with him.
- Color Motif: Blue skin? Check. Blue car? Check. The song Blue playing from his car? Check indeed. Anything blue for Marty aptly fits this trope to a T.
- Laser-Guided Karma: Marty gets the boot for all his troubles at the end, shutting down his production studio for good.
- Cool Car: His favorite blue Jaguar convertible until the wreck.
- Consummate Liar: He will never tell the truth. Only when he's been manipulated to do so.
- Hoist by His Own Petard: Ultimately, he's manipulated by all of his employees into fessing up that he stole Jason's story.
- Jerkass: Towards everyone under him, and to Jason. But what really seals the deal is what he does when Jason helps him get people excited for Big Fat Liar, only asking that he calls his parents and tells them that he took Jason's story. Not only does he not call Jason's parents, but he calls security on him and Kaylee, and gloats that he'll never tell the truth. This bites him hard in the end.
- Kick the Dog: It's easier to list a scene in which this doesn't happen.
- Large Ham: Never hesitates to raise his voice and act outlandishly.
- Manchild: He has a stuffed monkey that he plays with and talks to like a real person.
- Manipulative Bastard: Lies to everyone and uses emotional manipulation to keep his employees in line. It bites him hard in the end when they all turn on him.
- Nice Job Fixing It, Villain!: His loud confessional taunt gets Caught on Tape, proving Jason that he's telling the truth.
- The Nicknamer: And not with Flowery Insults, either. If you're up in your years, he'll call you "Grandpa" or "Father Time." If you're heavy, expect to hear references to eating and your weight.
- Prima Donna Producer Hoo-boy. His temper surpasses James Cameron's! Amusingly enough, the actual in-universe director of Big Fat Liar, Dustin "Dusty" Wong, is himself actually more of a Reasonable Authority Figure and spends much of the film as one of Marty's chew toys.
- Professional Butt-Kisser: To Marcus Duncan. He does everything he can to stay on his good side, including lying of course.
- Deus ex Machina: Monty pulling a HeelFace Turn and decides to help Jason and Kaylee after giving up from trying to admit Marty the truth by giving them one last fight, alongside the team that Marty has abused.
- The Dragon: Of Marty Wolf.
- HeelFace Turn: She was never "evil" so to speak, but she did have to work for Marty, however much she hated it. That is until Wolf betrayed Jason.
- Mistreatment-Induced Betrayal: When Wolf betrays Jason's promise to call his dad after the latter helps him get people excited for the movie, she decides that enough is enough.
- Tsundere: Type B. She's very mellow and hardworking but can be very harsh when stressed, especially with Marty's tirades.
- As Himself: Not only is Jaleel playing himself, his previous filmography is worked into his character.
- Berserk Button: Being called Urkel. Not only does Marty Wolf do this repeatedly, he threatens him with being forced to wear the Steve Urkel outfit.
- Cool Car: During the climax, Jaleel drives his BMW convertible to transport Marty only just to get him lost.
- Former Child Star: Of course, but he doesn't appreciate being called Urkel.
- I Am Not Spock: As mentioned before, he doesn't like when people call him Urkel In-Universe.
- Armor-Piercing Question: To Marty when he finds out he was plagiarizing Jason's paper for a film. Though he mistook Jason's age though.Marcus: You stole this idea for this movie from a 13 year old boy?
- Benevolent Boss: The moment he gets proof that Marty has committed a flat-out crime he fires the douchebag and continues the production of "Big Fat Liar" with Jason getting a "Story By" credit.
- Big Good: He's in a position of great power in Hollywood, and also does his best to make worthwhile movies while keeping his employees content.
- No-Nonsense Nemesis: To Marty Wolf.
- Reasonable Authority Figure: Pulls funding on Big Fat Liar when Whitaker & Fowl proves to be a Box Office Bomb. When Marty Wolf uses his charisma to sway people into wanting to see the movie, he only begrudgingly gives him a second chance. And when it comes to light that Wolf stole Jason's paper, he fires him immediately.
- Scary Black Man: Downplayed. He's a very strict man as president of Universal Studios but he's very calm and doesn't lose his temper when angered.
- As Himself: Averted, despite the fact that he easily could have just been Donald Faison as a famous actor.
- The Big Guy: He sides with and aids Jason and Kaylee in their mission and watches their back.
- Earn Your Happy Ending: After a Dark and Troubled Past, Frank comes from struggling actor to finally become the lead character for the In-Universe movie Big Fat Liar without Martys involvement.
- Dark and Troubled Past: Has years of troubled history with Marty, which explains his struggling persona.
- Gosh Dang It to Heck!: Enforced and lampshaded."Now I've got some R rated dialogue for you, but I'm gonna keep it PG, I'm gonna keep it PG!"
- Saying Sound Effects Out Loud: Frank imitated a failing car ignition towards Jason and Kaylee as a sign of losing his job since they owe him $100 for the ride.
- The Bully: Obviously. He targets Jason frequently.
- Disguised in Drag: Has to pose as Kaylee for his visit with Grandma Pearl.
- Jerk Jock: Well, he loves skateboarding, plus his arrogant persona.
- Pet the Dog: Bret also is proud of Jason when his name appeared in the movie. Must have taken a day to complete Character Development.
- Berserk Button: Upon seeing the bump on his tire, he gives out a furious tirade:"OH... MY... GOD! I WILL KILL YOU!"
- Big "OMG!": Twice. First when Marty bumped his tires then second at the ending when Marty shows up at his house as a clown. Both of them are Punctuated! For! Emphasis!
- Cool Car: A GMC Sierra monster truck with his name on it.
- Disproportionate Retribution: The Masher destroys Marty's car after the latter simply bumps into his tires.
- The Glasses Come Off: Pulls off his glasses to inspect the tires before going berserk.
- Jerkass: Even more than Marty! (Though, judging by his son's birthday party, he does turn out to be a sympathetic example.)
- No Indoor Voice: For a tough guy that loud.
- The Strongman: With that kind of a Cool Car and those kinds of tights, hard not to be.
- Only Known by Their Nickname: Throughout the movie, it's the only name we hear of him.
- Pre-Mortem One-Liner: Has this before The Masher slowly plows and wrecks Martys car.The Masher: Who's the tough guy now, pal?