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- Voiced by Brian Atkinson
- The Ace: Undefeated in the racetrack, he can generally win even without really trying or paying attention and usually starting behind (because he showed up late).
- Berserk Button: Smooth Jazz fills him with rage.
- Catchphrase: "Blame it on the thunder!"
- Cool Car: The Rabble Rouser.
- The Ditz: He isn't very capable outside of racing and generally exploits his fame in order to get by, although he's so nice and dimwitted that he doesn't realize it.
- Drives Like Crazy: He always drives like he's in a race, and usually crashes through things like walls and billboards.
- Heterosexual Life-Partners: With his mechanic Darnell. The two are almost always together and being apart for any reason is a cause for anxiety and depression in Buddy. The only time he wasn't horrified by the idea of being apart is when he didn't realize Darnell was close.
- Inexplicably Tailless: Averted. While his lack of a tail stands out next to his relatives and friends, Word of God confirms Buddy's breed as Rat Terrier, which are known to have bobtails, so his tail is unnoticeable.
- It's All About Me: To say his fame goes to his head would be putting it lightly, even if he doesn't mean to be conceited.
- Jerk with a Heart of Gold: He's a subversion. He doesn't mean to be insensitive, he's just so dumb he doesn't realize when he causes trouble. To be fair, he isn't blind to the needs of others and will very often do his best to help them out. He even says he loves the people of Greasepit as one of his first lines of the series.
- Lucky Seven: There are sevens painted on all four sides of The Rabble Rouser.
- The Pirates Who Don't Do Anything: He's only seen trucking once in the first episode, and even then he's transporting such a small load he can fit it in his cab without the need for a trailer. To be fair, he mostly uses the Rouser for racing instead of trucking.
- Perpetual Poverty: Despite winning a fat stack of cash money every week, he gives it all to his aunt to keep the business going.
- Red Oni, Blue Oni: The red to Darnell's blue.
- Story-Breaker Power: Turning around a race is generally as simple as using the Rouser's Nitro Boost (he can probably thank Darnell for that). No other racer seems to be able to do this besides Moneybags, and Moneybags promptly crashes when he attempts to.
- Voiced by Ted Riami
- Butt-Monkey: While not as extreme as other characters in the show, Darnell still takes his share of abuse as a side effect of Buddy's schemes.
- Cloud Cuckoolanders Minder: Being the more capable of the two makes him feel like this, which leads him to dejectedly labeling himself Buddy's babysitter in "Babysitters, Yo!"
- The Engineer: Has a general love of machines and tinkering with them, is at least as good a mechanic as Buddy is a racer, and created the Rabble Rouser from the ground up.
- Heterosexual Life-Partners: With Buddy, of course. They live together and are rarely seen apart.
- Not So Above It All: He is as equally likely to be Buddy's voice of reason as he is to just go along with whatever Zany Scheme Buddy has come up with.
- Red Oni, Blue Oni: The blue to Buddy's red.
Tex Arkana Jr.
- Voiced by Justin Michael
- 13 Is Unlucky: It's no coincidence that he's Buddy's rival and his truck is decorated with thirteen on three sides.
- Berserk Button: Subverted. He has no particular button to push, but Smooth Jazz calms down his aggression. Though he still would feel good over smashing a stereo that plays smooth jazz.
- Butt-Monkey: No matter what he tries, he'll always lose to Buddy.
- Catchphrase: "Yo yo yo!"
- Full-Boar Action: A hairy, scary pig, and Buddy's biggest rival.
- Infinite Supplies: Whatever he wants, his father provides for him. He even has multiple copies of his truck on hand.
- Not So Different: Both he and Buddy are quite inept; Tex Jr. is spoiled by his money while Buddy is spoiled by his fame.
- Punny Names: Texarkana is the name of two neighboring towns on the Texas-Arkansas border.
- Rich in Dollars, Poor in Sense: He may be the only person in Greasepit that's more dim-witted than Buddy (unfortunately he doesn't have Buddy's charm, kindness, or luck).
- The Rival: Has a tendency to compete with Buddy even outside of the racetrack.
- Stealth Pun: He's both a literal and figurative "road hog".
Flossie Trophydash/Muncie Thunderstruck
- Voiced by Debi Derryberry
- Voiced by Ted Riami
- Animal Stereotypes: Averted. He's a sheep, but fills the exact opposite roles most sheep are given, even as antagonists.
- Big Bad: For the first season, spending his time studying and attempting to destroy Buddy from behind the scenes or directly in a race.
- Cartoon Creature: According to Word of God, he is a sheep. In practice he looks like a bizarre koala mutant.
- Cool Car: His car, the Moneybags Mobile certainly qualifies. His hastily put together truck less so.
- Didn't Think This Through: He becomes Mayor of Greasepit solely so he can add himself to the local races, but he gets bogged down in the red tape of running the town taking him quite some time before he gets a chance to race.
- Evil Brit: He makes it quite clear that he wants to defeat Buddy and then also destroy Greasepit in the process.
- Man of Wealth and Taste
- Suddenly Voiced: He spends long enough being the "Creepy Silent New Guy" that it is a genuine surprise to people when he does start talking.
Buddy's #1 Fan.
Joseph "Handsome Joe" Handsomme
A feral cat that used to be a computer programmer for Cyberneck Systems until he lost his mind.
- Heroic BSoD: While it's initially assumed he went mad from making a terrible video game, he actually went insane with grief when he lost his pet mouse in one of the arcade cabinets.
- Ironic Nickname: He's rather disheveled and disfigured.
- The Unintelligible: He's incapable of talking so Darnell makes him a communicator out of a modified Speak and Spell.
A large canine with a short temper.
Nick the New Guy
The announcer at the Greasepit Speedway.
- Breathless Non Sequitur: He has a habit of just casually dropping personal information into his commentary.
The local Jackalope that always seems to have whatever job is relevant to the plot.
- Eyepatch of Power
- New Jobs As The Plot Demands: It's basically in his name.
- Paper-Thin Disguise: As a Buddy impersonator, he just wears a vest with Buddy's outfit poorly drawn on it. It still fools everyone.
- Punny Names: He sure holds a lot of jobs. You could say he's a Jack of All Trades.... a Jackalope, at that.
- Wild Card: His professions are equally likely to be helpful or antagonistic.
"Big Tex" Arkana
Tex Jr's father and owner of the Gold Brick Pawn Shop.
- Loan Shark: He gives loans to people and then aggressively repossesses all their stuff when they can't pay up.
Greasepit's resident raccoon burglar.
- Blatant Burglar: His day-to-day attire, not helped by the pattern of fur on his head that resembles a ski mask.
- Freudian Excuse: When confronted on his behavior, he explains he steals to deal with the pain of having his favorite teddy bear stolen from him when he was five.
- Punny Names
- Rascally Raccoon
Buddy's aunt, and owner of Thunderstruck Trucking. Buddy lives in her garage and he gives her his racing winnings in exchange.
- Backseat Driver: Even Buddy can't focus with her constant complaints.
- A Fool and Her New Money Are Soon Parted: It does not appear that Thunderstruck Trucking makes any revenue besides Buddy's winnings, and even then she's very good at wasting those funds. "Get The Hock Out" in particular has Auntie Uncle forced to pawn off most of her things as she's run out of Buddy's money before Buddy has even had a chance to earn any more.
- Gender-Blender Name: She's an aunt named Uncle.
- The Pirates Who Don't Do Anything: Buddy appears to be the only trucker in her employ, and given that all her revenue comes from his racing rather than deliveries, it does not seem like Thunderstruck Trucking does a whole lot of actual trucking.
The owner of Ziel's Truck Stop.
- Cool Old Guy: His first rule is no crazy parties in his Truck Stop. His second rule is he gets to be the DJ at any crazy parties in his Truck Stop.
Greasepit's equine police officer with a short temper. Eager to lock up Buddy Thunderstruck for good.
Cannonball's child-like deer deputy.
- Butt-Monkey: Suffers the most physical abuse of the two officers, including being the only one in the police truck when it suffers catastrophic crashes on multiple occasions.
- Catchphrase: No matter what happens to him, he'll be just fine and assure everyone "I'm okay!"
- Older Than They Look: Despite looking, sounding, acting and being treated like a child, Word of God confirms Hoisenberry is an adult.
- Trademark Favorite Food: He loves him his boxed grape juice.