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Voiced by: Charlie Adler (English), Teiyū Ichiryūsai (Japanese), Javier Rivero (LA), Gloria Roig (Spain), David Kruger (French)
- Acrofatic: For someone with so much body fat, she is very athletic and fast.
- Action Girl: She's more than capable of looking after herself.
- Annoying Younger Sibling: Occasionally, for Chicken.
- Badass Adorable: Super Cow? Check. Sweet and childlike? Check.
- Beware the Nice Ones: Cow is the nicest, sweetest character in the show, but mess with her precious big brother in any way, you're dead meat.
- Big Brother Worship: She adores her older smaller brother and cannot understand why he's always trying to get away from her.
- Big Eater: An appetite as big as she is.
- Big Fun: Her weight is stated as 600 pounds, though the earlier episodes (and some later ones) sometimes exaggerated this as anywhere from 700 pounds to 2 tons.
- Big Sister Instinct: Big in age, no, big size, YES. But the point is, she always faithfully comes to Chicken's aid whenever he's in danger.
- Big Little Sister: At first sight, one might think she's the older one just because she's bigger, but she calls Chicken, "Big Brother".
- Bigger on the Inside: Cow's internal anatomy is vast. Not just cause she's a cow with four stomachs. Its easy to get lost and trapped if accidentally swallowed as Chicken discovered that his sister is far fatter than he thought.
- "Blackmail" Is Such an Ugly Word: Somewhat subverted, though she is not above hesitating to use blackmail to get her brother to do what she wants.
- Blood Knight: As Supercow, an amusing complete contrast to her usual self.
- Cheerful Child: She's eternally optimistic.
- Clothes Make the Superman: Her security blanket is also the cape for her Super Cow outfit, and the source of all her alter ego's powers (including the ability to speak Spanish). At one point Chicken donned the outfit and proved useless, insisting the powers came from inside her. Cow then readjusts the blanket right side round, and Chicken becomes super charged.
- Cloudcuckoolander: One of many on this show.
- The Cloudcuckoolander Was Right: It isn't rare for some bizarre implication of Cow's to be real in this universe. Ironically she still usually ends up fully convinced by Chicken she is wrong.
- Comically Invincible Hero: Supercow always decimates her foes without them laying a single scratch, no exceptions. The only episode that so much as toyed with her meeting her match was her face-pulling war against a beaver, and even then when it reverted to usual fisticuffs it was the usual outcome.
- Crouching Moron, Hidden Badass: She's kinda dumb, but an amazing superhero.
- Elmuh Fudd Syndwome: Her general form of speech.
- Foolish Sibling, Responsible Sibling: Though sometimes roles do reserve.
- Genius Ditz/Smarter Than You Look: Some episodes show that she isn't as stupid as she behaves.
- Gentle Giant: She's a sweetheart and constantly shows her affection, unfortunately she doesn't realise how powerful she is.
- Gonky Femme: Ugly: Check. Masculine voice: Check. Dolls and tea parties: Check
- Infinite Supplies: She never runs out of milk. A freak milk accident resulted in hundreds of gallons washing away her and her family.
- Large Ham: Mainly in Supercow mode.
- Mama Bear: To Chicken, despite being his sister.
- Misunderstood Loner with a Heart of Gold: Mostly Chicken's fault for not bonding with her.
- Nice Girl: In contrast to Chicken.
- Nigh-Invulnerability: As Supercow.
- Obfuscating Stupidity: She proves she has a mischievous and witty side. A prime example culminates in her manipulating Chicken into being her personal slave over a quarter for a ride (that she knew their father owned already).
- The Pollyanna: Has a silly, cheerful personality.
- Promotion to Parent: She ends up becoming Chicken's babysitter, for life.
- Required Secondary Power: Her Super Cow alter-ego.
- Super Hero: Becomes one when she's Super Cow.
- Super Strength: As Supercow. One example would be "Buffalo Galls", where several members of said group jump onto her, and she throws them off easily.
- Tiny Guy, Huge Girl: The Huge Girl to Chicken's Tiny Guy.
- Youngest Child Wins: Zigzagged. She can be quite idiotic and has her own moments as The Chew Toy, but usually comes out better than her brother.
Voiced by: Charlie Adler (English), Takumi Yamazaki (Japanese), Yamil Atala (LA), César Martínez (Spain), Emmanuel Jacomy (French)
- Aloof Big Brother: Chicken does not always want to play with Cow.
- Aww, Look! They Really Do Love Each Other: Everyone's immediate reaction to whenever Chicken hugs Cow, and gets squashed in return.
- Big Brother Bully: Chicken can be an absolute jerk to his sister at times.
- Big Brother Instinct: He tries to pretend he really doesn't care about his sister at all, however when she appears to be in mortal danger, Chicken always comes through.
- Big Brother Mentor: On occasion when he is looking out for Cow, he'll try to educate her, only usually to come unstuck himself upon realizing how limited his knowledge of the world is.
- Brother–Sister Team: When Chicken puts his ego and pride aside.
- Butt Monkey / The Chew Toy
- Crouching Moron, Hidden Badass: Not as pronounced as Cow, but Chicken can be skillful at times. He donned the Supercow costume in at least two episodes after Cow was put out of action.
- The Cynic: Always thinks negatively of Chicken's actions.
- Deadpan Snarker: Mainly at Cow's expense.
- Grumpy Bear: He's quite cynical.
- Hypocritical Heartwarming: Often claims he's the only one allowed to bully his younger sister.
- I Don't Know Mortal Kombat: Averted. Chicken never seems to accept when he's no expert, and the opposition clearly has him outmatched and outgunned.
- Identity Impersonator: Impersonates Supercow to protect his sister's Secret Identity in one episode.
- Jerk with a Heart of Gold: He can be greedy and cynical, but he does have a good heart underneath.
- Little Big Brother: He's 11, but his 7-year-old sister is taller and stronger than he is.
- Made of Iron: A lot has happened to him... the majority of things that caused him pain have lasted for more than a few seconds. Although there are times when he's reached his limit and his little fragile frame shows.
- Manipulative Bastard: Sometimes uses Cow's naivete to his advantage. These usually end up backfiring onto him.
- Only Sane Man: Is the most normal character on the show.
- Protectorate: Cow always faithfully responds to his cries for help.
- Sibling Rivalry: Chicken hates how his younger sister is stronger, savvier, taller and far bigger than him. He cannot beat her physically or mentally no matter what he does.
- Tiny Guy, Huge Girl: The Tiny Guy to Cow's Huge Girl.
The Red Guy
Voiced by: Charlie Adler (English), Katsumi Suzuki (Japanese), Ricardo Hill (LA), David Sánchez Guinot (Spain), Michel Mella (French)
- Abusive Parents: As seen in the Professor Longhorn Steer episode, Red's mother feeds him gruel and keeps challenging him to fight her like a man much to Red's displeasure.
- Affably Evil: Despite being the devil, he's rather a mischievous and jerkish troublemaker instead of evil, but he can also be polite, friendly and even helpful.
- Anti-Villain: In later episodes.
- Badass Teacher: In The Karate Chic, he was a karate teacher.
- Beware the Silly Ones: He may be a silly buttwalking nudist, but he can also be quite dangerous when angered and has nearly killed Cow and Chicken more than once.
- Big Bad: The closest thing the show has to this.
- Big Red Devil: In the pilot, he is outright acknowledged to be the Devil. In the actual series, this was de-emphasized and he was referred to only as "the red guy". In the Cartoon Network IDW comics, this role is bumped back up significantly as he attempts to trick Chicken into selling his soul.
- Breakout Character: He was the only character to be a regular on both Cow and Chicken and I Am Weasel.
- The Devil Is a Loser: He's not very smart. Plus, he's a devil.
- Catchphrase: "Hello, it's me, (insert name of disguise persona here)."
- Jerkass: He spends most of his time harassing Cow and Chicken and tormenting their loved ones.
- Large Ham: Good luck naming 1 episode where he didn't scream at the top of his lungs.
- Dub Name Change: In the brazilian dub, he is known as Bum de Fora, possible a bowdlerization of the expression "Bunda de Fora" (Naked Butt), which is meaninful considering a running gag related to him. See Naked People Are Funny below.
- Laser-Guided Karma: He almost always gets his comeuppance at the end of each episode.
- No Indoor Voice: How many sentences can you count where he hasn't yelled at least once?
- Naked People Are Funny: A Running Gag in that he is naked and constantly emphasizes his big red butt. Even when disguised in a costume, he is usually still pantless.
- Nigh-Invulnerability: He once got thrown into lava... and started enjoying it seconds after screaming in agony.
- Otherworldly and Sexually Ambiguous: In spades. Considering he's a jack-of-all-trades, he can pull any kind of role of either gender... and not only that, whenever he plays a female, he clearly has a bust.
- Paper-Thin Disguise: Lots and lots of them, to the point that the opening theme shows dozens of Red Guys, each dressed in a different costume.
- Psychopathic Man Child: His demeanor most of the time is this.
- Punny Name: Most of his aliases have some allusion to his bare butt, such as "Mrs. Barederriere".
- Satan: In the pilot episode (and only the pilot episode).
- He seems to have returned to this role in the comics.
- Suddenly SHOUTING!: Does this all the time.
- Super Strength: Shown several times, such as in "Whose Supercow?", when he tries to lure Supercow out by pretending to be crushed by a piece of kryptonite several times his size. When it doesn't work, he just picks the thing up and throws it away.
- Also shown in "Boneless Kite", the episode where he dresses up as a pilot and gets into a tug-a-war with a small tribe...using Boneless Chicken. If Cow and Chicken didn't help the tribe, he might've won, considering how much they struggled against him.
- The Sociopath: Many of his behaviors in the series denote him as this from his lack of empathy over his brutal pranks and bullying to his various psychotic outbursts.
- Too Dumb to Live: Many of his failures are his own fault.
- Just look at "Comet!", where he mistakes a golf ball on a string for a comet, even though the side facing his telescope clearly had Dad's ball written on it! However, so did everyone except for Chicken...
- Villainous Breakdown: Near the end of "I Scream Man", he gives off one of the funniest breakdowns in the history of breakdowns due being heckled by the main characters (and a random pig) over ice cream.Red: AAAAAHHHH!!!!! I CAN'T TAKE IT ANYMORE!!!! I don't have any ice cream! Not one, so! EVER! (Hangs near the side of the cop, then switches to a calm, quiet voice) I don't even like ice cream, (switches back to Large Ham mode) OR KIDS! It says "Eye Screem" on my truck, not "Ice Cream"! Get it? 'cause I SCREAM!!! Look at me. (screams while spinning in circles) SCREAMING IS MY HOBBYYYYYY!!!!!!.Policeman: (hits Red with a sausage) It's the padded cell for you, scream man!
Mom and Dad
Voiced by: Candi Milo and Dee Bradley Baker (English), Aya Yamakawa and Masayuki Nakata (Japanese), Liza Willert and Genaro Vásquez (LA), Dany Laurent and Cedric Dumont (French)
- Bumbling Dad: Dad is somewhat funny.
- Cloud Cuckoolander: Consider the time that they woke their kids up at 3 a.m. to tell them how they met, or how they tried to make their kids scared of the dark.
- The Faceless: They are only ever seen from the legs down. Parodied to its logical extreme in the pilot episode when it is revealed that Mom and Dad are literally just two pairs of legs with no upper bodies.
- A common sight gag in the show is any time Mom and Dad have their shadows cast, they stop directly at the waist
- Standard '50s Father: Though what kind of standard '50s father makes passing references to possibly being a female-to-male transsexual? Or being less of a man than his wife?
- Wacky Parent, Serious Child: The Wacky Parents to Chicken's and, to some extent, Cow's Serious Child.
Flem and Earl
Flem Voiced by: Howard Morris (English, primarily), Maurice LaMarche (English, occasionally), Katsumi Suzuki (Japanese), Mario Filio (LA), Aleix Estadella (Spain), Cyril Monge (French)
Earl Voiced by: Dan Castellaneta (English, using a less drunk version of his Barney Gumble voice), Takayuki Okada (Japanese), Genaro Vásquez (LA), Yann Le Madic (French)
- Fat and Skinny: Flem and Earl, respectively.
- Gender-Blender Name: In "Dirty Laundry," The Red Guy (as Jeraldo Rearviewa) doctored their birth certificates so their middle names (actually last, since viewers never find out what their last names are) are Beatrice and Jennifer (Earl "Beatrice" and Flem "Jennifer") so they can get arrested for being boys with girl middle names.
- Interspecies Romance: The two have a crush on Cow.
- Only One Name: Flem even lampshades it in "Dirty Laundry." ("I don't even have a last name! I'm just Flem!")
- Those Two Guys: They are always seen together.
Voiced by: Candi Milo (English), Yuko Sato (Japanese)
- Beehive Hairdo: Has a curly red beehive that's a twist between Marge Simpson and Joan Holloway Harris.
- Fiery Redhead: Red-haired and very bad tempered.
- Gonky Femme: She is very hideous and loud, yet dresses very feminine and acts boy-crazy.
- No Indoor Voice: To say she's loud would be an understatement.
- No Name Given: Her name was never revealed
- Sadist Teacher: She insults her students and constantly tells them to shut their pie-holes.
Manure the Bear
Voiced by: Dee Bradley Baker
- A Day in the Limelight: "Cow's Toys" in which he, Crabs and Piles leave Cow's room to search for their original owner - Maiden Hong Kong.
Voiced by: Pamela Adlon
Voiced by: Charlie Adler (English), Hideki Ogihara (Japanese), Genaro Vásquez (LA), Aleix Estadella (Spain)
- Deadpan Snarker: So deadpan it's hard to tell whether or not he's joking.
- Out of Focus: Was a recurring character in the first 2 seasons, but was absent in Season 3 and made a cameo in Season 4.
Voiced by: Tom Kenny
Crabs the Warthog
Voiced by: Dee Bradley Baker
- A Day in the Limelight: See Manure the Bear.
Piles the Beaver
Voiced by: Tom Kenny
- A Day in the Limelight: Again, see Manure the Bear.
The Buffalo Gals
Voiced by: Judy Tenuda, Candi Milo, and various
- Butch Lesbian: Very much hinted at and are very masculine looking.
- Lesbian Jock: They love softball.
Professor Longhorn Steer
Voiced by: Tom Kenny
Cousin Black Sheep
Voiced by: Tom Kenny
- Black Sheep/Meaningful Name: He's the black sheep of the family.
- Nice Guy: Despite being the black sheep of his family, he's a kind person.
Voiced by: Michael Stanton
Voiced by: Dee Bradley Baker
Voiced by: Dee Bradley Baker