Characters / Yin Yang Yo!

These are the characters of Yin Yang Yo!.

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Main Characters

Yin

Voiced by: Stephanie Morgenstern

A pink, female rabbit and the twin sister of Yang. She mostly uses the Mystic side of Woo Foo, but she is also skilled in Martial Arts. Yin is often described as intelligent, cute, girly, and sassy, but she's often as stubborn as her brother while being a "neat freak" and a "control freak". Yin generally has a good sense of right and wrong, and will often do the right thing.

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• Action Girl: She's the main heroine of the show and is frequently fighting against evil.
• All Girls Like Ponies: Or Twonicorns, as the case may be.
• All Girls Want Bad Boys: She's only hot for Coop when he's evil. She reveals this was a phase and snaps out of it. She hooks up with Coop once he channels his powers for good.
• Attention Whore: Incredibly during "Yin-Credible" where she takes credit for Yang's witty insults just to hog up the spotlight. When she's put on the spot and has to whip out quips as quick as he does in the midst of battle, this ultimately ends up biting her in the butt.
  • There's also the time Yin attracted all the boys around her in "Old School" in her new hot armor and teenage body.
• Awesomeness by Analysis: One of her best strengths is being able to come up with solutions and make right decisions at the drop of a hat. This is the focus of "Basic Yin-Stinct" where Carl tricks her into eating magic seeds of doubt that cloud her usually crystal clear deduction skills.
• Badass Adorable: She's the cuter of the two twins and is just a bigger ass-kicker as her brother.
• Badass Bookworm: The brightest out of the twins and often has her nose in a book.
• Badass Driver: Yin is under the age to have a license but smoothly navigates the race in "Yindianapolis 500", her only lesson being to learn on the fly after Master Yo fell asleep behind the steering wheel.
• Balloon Belly: Briefly in "How The Cookie Crumbles"
• Barrier Warrior: Due to a number of Deflector Shields, she's able to create force fields as a shield or use them as their own weapons.
• Brains and Brawn: The Brains to Yang's Brawn.
• Brainwashed and Crazy: Coop keeps corrupting her with his dark energy throughout the duration of "Gone A Fowl", eventually turning her completely evil.
• Brother–Sister Team: With Yang.
• Butt-Monkey: Not as bad as Yang but she still suffers for the sake of comedy quite a bit.
• Calling Your Attacks: Yincinerate and Transfoomate are common spells she uses.
• The Chew Toy: Her brother tends to get the bulk of the Amusing Injuries but Yin is just as likely to take a beating for the sake of comedy.
• The Chosen One: Subverted in "Camp Magic Pants" where Terry Otter as well as Yuck possessing the Headmaster lure Yin into becoming evil so she can awaken the pants statue, making her the fabled "chosen one".
• Color-Coded Wizardry: The color of her magic tends to change depending on the spell: it is normally a bright shade of blue while her fire based attacks are a fitting red; when activating her aura, it's always pink.
• Corrupt the Cutie: Twice. One time by Yuck during "Camp Magic Pants" by prompting her to misuse magic to the point she became evil and the second time by Coop who practically brainwashes her with his dark energy.
• Cute and Psycho: Has some shades of this, especially during "The Trouble With Two-Nicorns" where she proves to have an explosive, violent rage if the time calls for it.
• Cute Bookworm: A much more outgoing example but Yin's downtime is almost always spent with her nose in a book, be it studying or reading a novel.
• Cute Bruiser: She's adorable and has repeatedly defeated against evil.
• Dark Is Not Evil: Her name quite literally translates to "darkness" as she is the black half of the Taoist symbol, but she is the show's main heroine for a reason.
• Deadpan Snarker: She always says snarky remarks to both her enemies and to her brother.
• Deliberately Cute Child: The most likely out of the twins to play up her cuteness factor if it ensures getting what she wants. Her signature "cute face" is this trope to its logical extent.
• Dude Magnet: Similar to her brother, Yin has just as much luck in the romance department and has short time hookups.
• Evil Makeover: During "Gown a Fowl", Yin's appearance becomes more and more dark as Coop's evil nature starts to cling onto her, starting off with simply dark clothes and make up until her fur and aura entirely change.
• Excessive Evil Eyeshadow: Takes up a sudden fondness for dark and heavy eye make up when Coop's evil corrupts her, as well as the rest of her clothing until the markings give her something similar to the Nightmaster.
• Foolish Sibling, Responsible Sibling: Responsible to Yang's Foolish.
• Girls Love Stuffed Animals: She religiously collects Twonicorn dolls and has a few random stuffed animals, one of which Yang threatens in "An Inconvenient Tooth".
• Girly Bruiser: She's a pink, boy crazy tween who loves cute things and jewelry but it is still an incredibly competent fighter.
• Granola Girl: She's implied to be a vegetarian as she's never seen eating meat. Also in "Basic-Yinstinct" she suggests using a scooter instead of a motorcycle to chase after to Carl because it's more environmentally friendly.
• Half-Identical Twins: With her brother Yang.
• Heinz Hybrid: Master Yo is her father, making her and Yang half-panda.
• Heroic BSoD: After the reveal that Brett was nothing but a ploy to trick Yin into helping Yuck get his physical form back, Yin, already hurt by Yang mocking her earlier in the episode, is too heartbroken to even bring herself to fight back. An indirect pep talk from Yang is the only way she snaps out of it.
• Hypocritical Heartwarming: She says that she's the only one who gets to laugh at Yang.
• Innocent Blue Eyes
• Inter Species Romance: With Coop (a chicken) and Clamuel (a clam) among others.
• Kung-Fu Wizard: A subtle part of her Character Development. Initially she primarily used magic and no real might abilities, but after the Season 1 finale, she has been seen fighting more physically, combining it with her magic.
• Levitating Lotus Position: Her Woo Foo abilities are able to levitate objects and others.
• Little Miss Badass: A cute tweenage girl but also an absolute menace of a fighter with or without magic.
• Missing Mom: We never find out who her and Yang's biological mother is. Her questioning Master Yo, her and Yang's biological father, about her is the last joke of the series.
• My Sister Is Off-Limits: A brother variant: she isn't very supportive about Lina's relationship with Yang, though her reasoning equates to wanting to spend more time with her friend rather than Lina with Yang; as a matter of fact, a flashback showed that Yin convinced Lina to "play hard to get" during an offscreen moment when the two first met Lina.
• Neat Freak: Yin craves order and cleanliness and has much better hygiene than her slob of a brother. This has been weaponized against her twice by Fastidious whose not only more of a Neat Freak than she is, but is willing to destroy anyone who gets in the way of it.
• Nice, Mean, and In-Between: The In-Between to Dave's Nice and Yang's Mean.
• Not So Above It All: Yin is often the more level headed and mature out of the twins but she's just as capable as being as indulgent, lazy, and narcissistic as her brother.
• Official Couple: With Coop during season two.
• Pink Girl, Blue Boy: Pink Girl to Yang's Blue Boy.
• Pink Means Feminine: She's has pink fur and is very feminine.
• Pint-Sized Powerhouse: Like Yang, she very short and has fought and defeated against many ten times her size.
• Playing with Fire: "Yincinerate!"
• Polar Opposite Twins: With Yang.
• Purple Is Powerful: She's a powerhouse and her eyes become purple instead of blue during a few frames in the opening.
• Red Oni, Blue Oni: The studious, mature Blue to Yang's temperamental, violent Red.
• Rose-Haired Sweetie: Though the "sweetie" part can sometimes be debatable, Yin is a rather nice girl with good intentions if her selfishness doesn't get in the way.
• Sibling Yin-Yang: With Yang, duh.
• Slobs Versus Snobs: The Snob to Yang's Slob. The entirety of "Messy Relationships" has her going to literal war with the Stink Aardvark Kingdom after she's under the impression they're attacking her with filth.
• Super-Cute Superpowers: Mostly invoked. Yin's Transfoomate ability allows her to change objects into anything she desires but she seems to have a preference for flowers and butterflies. During "Howl of the Weenie" she even weaponizes her own cuteness to save the city, conjuring up a ballerina tutu, dressing herself up like a baby, and shapeshiting into a small pink cat.
  • Even her utilizing Might has her rebranding Yang's Paws of Pain into Pretty Pink Paws of Pain.
• The Spock: Her sharp intellect makes her great at coming up with plans on the spot.
• Sword And Sorceress: The Sorcerer to Yang's Sword.
• Taking the Bullet: Jumps in front of the Woo Foo Aura Drain Eradicus originally aims at Yang, ultimately letting herself slowly die in his place.
• Transmutation: Her Transfoomate ability lets her change objects into almost anything she needs or eliminate minor obstacles-her preferences being flowers and butterflies. She can also conjure up clothing or minorly alter her appearance.
• Waif-Fu: Yin is just as tiny as her brother but proves to be of equal physical strength, even if her preferred fighting style relies more on her mystical powers. She's not only defeated foes twice her size and can perfectly hold her own in a fist fight against grown men but once tore an entire tree out of the ground.
• White Bunny: Colorfully averted.
• Whole Costume Reference: Her magical girl attire as Yinsecure in "Wonder Tweens Go!" is a not so subtle reference to her voice actresses' role as the English dub for Sailor Venus.

Yang

Voiced by: Scott McCord

A blue, male rabbit and the twin brother of Yin. He mostly uses the Might side of Woo Foo, but he can also use the Mystic side of Woo Foo. Yang is a Cloud Cuckoolander, lucky, courageous, and has a liking for clowns. Despite not usually showing it, he really cares about his sister and Master Yo's well-being. He enjoys fighting, and likes hitting stuff.

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• Amazon Chaser: He falls head over heels for Smoke the instant she starts fighting a group of thugs in her first appearance.
• Attention Deficit... Ooh, Shiny!: Especially the case in "Brain Drain" where Master Yo grows frustrated with Yang's inability to stay focused. Though he ends up being able to use his brain towards the end, he still struggles with this.
  • Yang just loves meat (Isn't he a rabbit?) and Yin often exploits this by throwing him a steak just to get him out of the picture.
• Attention Whore: Not quite to the same extent as his sister but Yang desperately yearns to be immortalized for his work as a Woo Foo knight in ancient texts, a desire which is easily exploited in "Welcome to the Dark Tomorrow".
• Badass Adorable: A cute blue rabbit who is a Woo Foo practitioner.
• Battle Cry: "Chee, Hoo, Waa!"
• Big Brother Instinct: He's was technically born first and when it matters most, Yang will immediately jump to the aid of his sister if she's in a pinch. His speech towards Ultimoose in "Dojo Oh No" and his fight with Yuck towards the end of "Falling Yin Love" speaks volumes about how protective he truly is.
• Blood Knight: His primary motivation for becoming a Woo Foo Knight is wanting to hit stuff. In fact Yang will seek out any opportunity to use violence even in situations that don't call for it.
• Blow You Away: "Foonado!"
• Blue Is Heroic: A blue rabbit and one of the main heroes.
• Book Dumb: Yang is not very bright, especially compared to his more book smart sister. He struggles with basic math, has a somewhat limited vocabulary, and is more often than not an actions first, consequences later kind of person. And yet he still possesses a quick wit and undeniable combat prowess in the heat of conflict.
• Brains and Brawn: The Brawn to Yin's Brains.
• Brilliant, but Lazy: In "Doomed to Repeat It", he says that he does learn stuff, but he doesn't want Master Yo to know that, so that he could get away with more; in fact, if he is willing to think, he is able to escape traps/situations more often (unless he wanted to be trapped/captured just so he could fight some more).
• Brother–Sister Team: With Yin.
• Bruiser with a Soft Center: "Touchy Feelings" reveals he's this: when his emotions are blasted out of him (takin the shape of small color bunnies of energy half his height), Yin tries to find the Love bunny, since Yang loves to kick butt. While searching for it, the Love bunny approaches behind her and Fr-ped: it's practically a Kaiju in terms of size, being almost twice as tall as the buildings of the city. Yin and the villain lampshade this revelation on much Yang really cares:
  Fre-Ped: Wow, he sure bottles up that thing deep inside there, doesn't he?
  Yin: It's a boy thing.
• Butt-Monkey: He suffers a lot because of every other character on the show which includes bad guys (especially Saranoia), his sister often picking on him and his lazy panda guardian neglecting parental duties or worse eating up Yang's bamboo sword. Yang finally gets his revenge on just about everybody in "Deja Foo".
• Calling Your Attacks: Every time Yang learns a new attack, he calls it out when using it.
• Catchphrase: Several. There's "Aw pellets!", "Curse you math!" and "Thinking makes my brain hurt!"
• Chick Magnet: Has gotten the attention of Lina, Melodia, Princess of the Stink Aardvarks and even the dangerous Smoke.
• Comically Missing the Point: Pretty much Once per Episode.
• Companion Cube: Has a wooden replica of Master Yo called Yo-Chop that he carries around in a backpack and cuddles for comfort throughout "Dummied Up".
• Crouching Moron, Hidden Badass: Sure he isn't as smart as his sister, but he is still a powerful warrior and capable of surprising feats and even more surprising thoughts.
• Cute Bruiser: He's not as cute as Yin, but is still a massive ass-kicker.
• Deadpan Snarker: Despite Yin being the brains, Yang still has a sharp wit to him.
• Dumb and Drummer: In "The Gig is Up", he's the drummer of the band.
• Dumb Is Good: As dimwitted as he is heroic.
• Dumb Muscle: Tends to rely too much on violence to settle his problems even if he does have his moments of clarity. In one episode he magically becomes super big and strong at the cost of becoming even stupider than usual, although he realizes that his brain is the same size as before and he has not actually gotten mentally weaker.
• Excuse Me While I Multitask: Has shown more than a few times that he's able to make wise cracks and goof off, even engaging in a full conversation with someone without looking at whoever is attacking him.
• Family Eye Resemblance: The earliest indication that he's Master Yo's biological son is their similar eye color.
• Foolish Sibling, Responsible Sibling: Foolish to Yin's Responsible.
• Half-Identical Twins: With Yin.
• Heinz Hybrid: Master Yo is his father, making him and Yin half-panda.
• Hidden Depths:
  • He is actually more intelligent than he appears to be and when he puts his mind to it (he pretends to be dumber so Master Yo will let him get away with more), can be very studious and learn techniques quickly.
  • In an episode revolving around mind-reading, we learn he loves writing poetry (usually about Lina) as well as fantasizing about painting her toenails.
• Heroes Love Dogs: In "Pets Peeved" he's deadset on proving his responsibility by adopting a Puppygriff, their world's equivalent to a house dog, after watching a movie about one hundreds of times.
• Hot-Blooded: He's and incredibly aggressive and downright malicious fighter when compared to his sister Yin.
• I Shall Taunt You: Especially during "Yin-Credible", it's shown that he tends to get the upper hand on foes by teasing them throughout.
• Inter Species Romance: With Lina who turns out to be a dog.
• It's All About Me: Tends to be rather selfish in his actions if he feels he'll achieve some sort of award in the end, but it normally turns out to be a façade to hide his insecurities.
• Jerk with a Heart of Gold: Yang is a selfish, violent, and immature little boy who seems to be practicing Woo Foo mostly to satisfy his constant craving for action. Even post his proper Character Development, he's shown to have a natural heroic streak, willing to put his life on the line multiple times if it means saving his loved ones.
• KidAnova: He's a pre-teen yet has gotten the attention of a few females, one of which older than him.
• Large Ham: Befitting his loud fighting style.
• Leeroy Jenkins: And how? Yang's blind ambition for combat directly clashes with his sister's more strategic approach. He becomes much more tactical overtime but his recklessness otherwise proves to be a major Fatal Flaw.
• Light Is Good: He symbolizes the white half of the Taoist and underneath his foolishness, he's a very competent hero.
• Likes Older Women: He was in a romantic relationship with Smoke, who is a couple years older than him, at one point.
• Love at First Sight: Towards Lina.
• The McCoy: Boisterous, impulsive and not necessarily the brightest character in the series.
• Missing Mom: We never find out who his and Yin's biological mother is. Him questioning Master Yo, his and Yin's biological father, about her is the last joke of the series.
• Morph Weapon: Yang's sword can shift between a variety of forms on command like a staff, a boomerang, nun-chucks, a jam hammer, and even a magnifying glass.
• Nice, Mean, and In-Between: The mean to Dave's Nice and Yin's In-Between.
• Obfuscating Stupidity: Yang is smarter than he initially appears but he does this so he can get away with things and to make people not to expect anything from him; it's even actually lampshaded in an episode.
• Official Couple: With Lina.
• Pink Girl, Blue Boy: Blue Boy to Yin's Pink Girl.
• Pint-Sized Powerhouse: He's extremely short, but has fought against enemies several times his size.
• Polar Opposite Twins: With Yin.
• Power Glows: His sword glows when it is especially powerful, most likely through charging it with Woo Foo energy.
• Power Perversion Potential: Yang only has any interest in learning invisibility because he can use to pull off pranks...and spy on Lina in the bathroom.
• Red Oni, Blue Oni: The temperamental, violent Red to Yin's studious, mature Blue
• Revenge: In "Deja Foo", being fed up with the way the world mistreats him (that includes Yin and Yo), when he gets a time loop redo he throws pancakes at Yin's face and frames Yo for ruining a bad guy picnic, before inadvertently getting them killed. He regrets this.
• Sibling Yin-Yang: With Yin, duh.
• Slobs Versus Snobs: The Slob to Yin's Snob.
• Stalker with a Crush: A mild example though it's no longer the case when him and Lina become a couple.
• Sword and Sorcerer: The Sword to Yin's Sorcerer.
• Tsundere: A family-love related version with Yin and Yo, often trying to avoid showing affection or dismissing tender moments with a deadpan "whatever".
• Unwitting Pawn: Yang is very easily persuaded by Eradicus' minions posing as guiding Woo Foo spirits, tricking him into reviving their master by gathering mystical artifacts. Little to his knowledge, he was actually helping lead the world into an apocalypse rather than stopping it.
• Vitriolic Best Buds: With Roger Jr.
• White Bunny: Colorfully averted.
• Why Did It Have to Be Snakes?: He hates dentists.

Master Yo

Voiced by: Martin Roach

Teacher of Yin and Yang, Yo is a grumpy old panda whose age is unknown though implied to be a centenarian (as he'd missed his 117th high school reunion). Yo has great sage wisdom and is a master in the Woo Foo arts, but is also pretty lazy and prone to lounging around. Master Yo mentors Yin and Yang in the Woo Foo way to save the world, but it wasn't his choice; the spirits of past Woo Foo warriors stopped him from watching a movie called "Who Stole the Cookie" until he decided to do it. He's able to use both might and magic and has moves that Yin and Yang have no clue about.

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• Action Dad: He's revealed to be Yin and Yang's biological father in the series finale.
• Afro Asskicker: Back in his younger days, he dawned skills as broad as his afro.
• Badass Adorable: When he was reverted to a toddler in the episode, "Turn About" at three years old, already more talented and powerful than Yin and Yang combined: he could already use Woo Foo Aura better than them and even some unique tricks like calling down thunder with Woo Foo Lightning. Lampshaded:
  Yin: He's 3 and he can Fooportate?!
  Yang: No wonder he's a Woo Foo Master now! I wonder what else he can do?
• Big Eater: He seems to do nothing around the house but binging on food and Tv.
• Brilliant, but Lazy: He's a master of Woo Foo, but is now perfectly content to lounge around and do nothing.
• Bunny-Ears Lawyer: A goofy, out of shape old man who nonetheless knows very important lessons and can still kick ass.
• Casanova Wannabe: He often tries to flirt with ladies with failing results. One episode Hex of the Ex revolves around Yo's love life, where it's shown he was quite the player in his youth and a Jerkass to his various girlfriends who later tried to kill him.
• Child Prodigy: Look at Badass Adorable above; considering he'd mastered skills that Yin and Yang barely even know about at only three, he qualifies.
• Cool Old Guy: More than a century old, but still capable of kicking butt.
• Dirty Old Man: Attends a macrame gathering with Yin just so he can meet up with single women that are most likely way younger than he is.
• Fat Slob: He's a fat panda who spends most of his time sleeping, eating junk food, and lazing around. He's also a flatulent slob who constantly burps and farts, and he's shown to have bad manners and poor personal hygiene in general.
• Fighting Panda: Master Yo is a grump and lazy but wise and experienced panda who teaches Yin and Yang.
• Gasshole: He belches and farts on multiple occasions, and is shown to be quite gassy due to his constant eating.
• Good Is Not Nice: He's more of a obstacle towards Yin and Yang than a mentor. He almost never does any action, throws Yin and Yang into sticky situations just because he thinks it'll help them build character and neglects to pay any parental support to the two.
• Grumpy Old Man: He's a century old and is very grump most of the time.
• Heavy Sleeper: Generally downplayed for the most part.
• Hero of Another Story: Currently trading out his past success to be a mentor though he isn't too shabby on his past skills and still contains a lot of knowledge.
• Hypocrite: In "A Walk in the Woods", he gets mad about Yin and Yang for being lazy while Yo is much lazier than those two as he's always sleeping or forcing the two to do chores for him.
• I Am Big Boned: In "Touchy Feelings" where he was losing layers of his body and stripped down to bone, he mentions this; even so, he retains this mindset when his flesh returns.
• Interspecies Romance: In relation to the previous trope, Yo should have had a rabbit girlfriend/wife.
• Jerk with a Heart of Gold: A lazy, gluttonous, and rude old panda, but he does care a lot about Yin and Yang, willing to do what he can to protect them.
• The Kirk: He's this towards Yin and Yang at heart, though he frequently fails to fully qualify due to his laziness and frequent apathy towards so many things.
• Last of His Kind: He's the last panda on earth.
• Luke, I Am Your Father: He's revealed to be the twins' biological father in the series finale.
• Magic Knight: Unlike Yin and Yang who focus exclusively on the magic and martial arts sides of Woo Foo, he is an expert with both.
• Papa Wolf: Although he regularly lets Yin and Yang handle their own battles, he's more than willing to stand up for and rush to their aid if he sees they're in need of help. It especially applies to this after the reveal that he's their biological father.
• Parental Substitute: Practically raised two children due to their absence of their actual parents though it later turns out that he was their father all along yet had his memory wiped of that knowledge to train them "without bias and fear."
• Old Master: A spoofed example.
• The Pig-Pen: Pretty much his entire character. He's a fat, old, flatulent panda who loves to stuff his face in junk food and who's notoriously unmannered and unhygienic. Several characters comment on him having strong B.O. and bad breath. In the episode Voyage to the Center of the Yo, it is revealed that he hasn't cleaned his ears in years.
• Really 700 Years Old: Master Yo looks visibly eldery but "Voyage to the Center of Yo" reveals he's been alive for at least over a hundred years.
• Spirit Advisor: Despite being alive, his spirit appears to advice Yin and Yang when he's not present.
• Strong as They Need to Be: How powerful Yo is depends almost entirely on the plot. Sometimes he's stronger than Yin and Yang while other times he suffers from The Worf Effect to show off how strong an enemy is before Yin and Yang defeat them.
• Trademark Favorite Food: He loves his soft pretzels.
• Trickster Mentor: He takes some pleasure in letting his students make their mistakes and him rubbing it in their faces regarding his advice.

Allies

Lina

Voiced by: Novie Edwards

An aqua-green female dog, Lina is Yang's girlfriend (after "Gone-A-Fowl") and Yin's best friend. She is a nice, yet short-tempered girl who lives on a farm with her father. She was first introduced in "Beetlemania", when Yang pretended to be a Woo Foo Warrior in order to impress her, but his plan backfired after he had to fight a giant steel beetle; eventually, Yin was able to get Yang to tell the truth. Lina is often unafraid to state her opinion and even talks back to her father. She was trained by Yin and Yang to use Woo Foo and is the second-in-command of the Woo Foo army Yin and Yang gathered together.

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• Action Girl: She was somewhat this as a civilian. Became a more prominent example once she Took a Level in Badass and learned Woo Foo's Might techniques.
• Birds of a Feather: Her and Yang; while she is often the voice of reason and more level-headed than Yang is, she can also be pretty hot-headed (albeit in a more subdued matter) and some of her dates with Yang show they love to go out and whack gophers.
• Blush Sticker: She's seen with blushy cheeks all the time.
• Cartoon Creature: Subverted. Lina is a dog, apparently resembling some sort of Welsh Corgi, which isn't at all evident in her base design. "Yin Yang You!" not only reveals her species but lampshades it quite a bit with Carl and not even Yang not knowing what species she was.
• Catchphrase: "Talk to the hand!"
• Deadpan Snarker: Being the sassy type, she's also as snarky as Yin and Yang.
• Farmer's Daughter
• Furry Female Mane: Has short magenta hair.
• Girly Girl with a Tomboy Streak: Her outfit includes a purple dress and headband and she's best friends with the even more girly Yin, but she absolutely loves the unconventional dates she has with Yang like gopher whacking.
• Interspecies Romance: With Yang. She's a dog.
• The Kirk: Whenever she's paired up with Yin and Yang and acting as the Only Sane Woman.
• Little Miss Badass: Becomes one when she learns the techniques of Woo Foo.
• The Noseless: Despite being a dog, she has no nose whatsoever.
• Official Couple: With Yang.
• Only Sane Woman: She's this when she has to deal with Yin and Yang arguing.
• Sassy Black Woman: She's blue but her personality and mannerisms lean heavily on her being coded as black.
• Took a Level in Badass: Learns some of the Might techniques of Woo Foo: she's seen using the Paws of Pain a couple of times and one scene in the final battle has her even using a glowing bamboo sword like Yang.
• Tsundere: Lampshaded by Lina herself in "Gone-A-Fowl".
• Violently Protective Girlfriend: Defending Yang from Evil Yin in "Gone-A-Fowl".

Roger Jr.

Voiced by: Damon Papadopoulos

Logically the son of Yin and Yang's part-time enemy, Roger the Skelewog. At first, Roger Jr. was a bully to Yin and Yang, having mock fights with Yang and teasing him and Yin, but, during "Woofoogeddon", it was revealed he longed to be Yang's best friend. Roger Jr., being a monster, has displayed super strength, such as when he easily took out a whole group of the Night Master's soldiers just by running by them with his arms. He is also a member of the Woo Foo army Yin and Yang gathered together.

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• Breath Weapon: He has the ability to breathe fire.
• Friendly Enemy: At first, Roger Jr. was a bully to Yin and Yang, having mock fights with Yang and teasing him and Yin, but during Woofoogeddon/Who Knows What Evil Lurks, it was revealed he longed to be Yang's best friend. In Season 2, he ultimately ends up be friending Yin and Yang and their other friends.
• Hidden Heart of Gold: He pretends to hate Yang, but he longs to be his friend.
• Super-Strength: Roger Jr. Being a monster, has displayed super strength such as when he easily took a whole group of the Night Master's soldiers just by running by them with his arms.
• Vitriolic Best Buds: With Yang.

Dave

Voiced by: Dwayne Hill

A magical talking tree stump, Dave is a dork and is considered pathetic by his friends. Many times, Dave is often caught in the crossfire of battles or hurt in some way by friend and/or foe. He's considered whiny, talks nonstop about his family of trees, and is never noticed. As discovered in "Stuck", Dave has the ability to communicate with and manipulate non sentient plants, which apparently surpasses that of the other characters. He later became a member of Yin and Yang's Woo Foo Army.

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• Butt-Monkey: Constantly deemed annoying and whiny by anyone who meets him, including his group of friends.
• The Chew Toy: Which is saying something given how much slapstick everyone else suffers.
• The Friend Nobody Likes: An affiliate of Yin and Yang's crew, but is treated with very little (if any) respect.
• Green Thumb: Capable of communicating and manipulating other plants which ends up making him quite powerful.
• Nice, Mean, and In-Between: The Nice to Yang's Mean and Yin's In-Between.
• Plant Person: Literally a talking tree stump; he even has a squirrel living in him.
• Only Sane Man: Dave tends to provide more astute observations amongst his social group which is especially apparent in "Wonder Tweens Go" when he points out the list of cliches their team is embodying. Too bad no one ever listens to him.
• Took a Level in Badass: Learns about his abilities during "Stuck" and from then on has been able to use to help out.
• Youthful Freckles: He's young and have visible freckles on his cheeks.

Coop

Voiced by: Dwayne Hill

A nerdy chicken who appears to be scared of any threats and has a huge crush on Yin but because she never returned any of his feelings, Coop joined the Night Master in exchange for the promise to have Yin when the world was taken over. He is a minor villain and he is seen with some of the other villains in the Yin, Yang, Yo intro in season 1. Coop gave the impression of incompetence, but in reality, he had powers and abilities rivaling Yin and Yang's; in the end, Coop couldn't bring himself to go through with the Night Master's plans and held him in place so Yin and Yang could destroy him. Eventually, he returns and ends up overwhelmed by the power of the Night Master, temporarily becoming evil before snapping to normal and going off to train and gain control. Upon doing so, he joins the Woo Foo army.

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• Abhorrent Admirer: Towards Yin due to his obsessive behavior and general nature that Yin finds more annoying than endearing, no matter how hard the poor guy tries to impress her.
• All Love Is Unrequited: His feelings towards Yin seem like they'll never be returned that is until the ending of the series when Yin seems to return his feelings.
• The Dragon: To the Night Master in Season 1 prior to his Heel–Face Turn.
• Inter Species Romance: A chicken who has, occasionally, gotten romantically involved with a rabbit.
• The Mole: Acted as a spy for the Night Master.
• Nerd Glasses: He's incredibly nerdy and wears very large, nerdy glasses.
• Official Couple: Later gets the relationship he's been yearning for with Yin.
• Punny Name: A chicken named Coop, as in a chicken coop.
• Single-Target Sexuality: Only shows to have eyes for Yin the entire series...unless you count his strange fondness for corn (though he is a chicken.)
• Stalker with a Crush: To Yin.
• Superpowered Evil Side: Due to the Night Master's presence infesting him, he can become a super powered and muscular version of himself that comes along whenever he grows agitated; of course, this nearly corrupts Yin and he disappears for many episodes to control it.
• Took a Level in Badass: In his quest to try and win Yin's affection, he trains under the Night Master and quickly becomes as strong as Yin and Yang; he does further still when he reabsorbs some of the Night Master's power in Season 2 and learns to control it.
• Villain Has a Point: After Yin realizes he was working for the Night Master, she accuses Coop of betraying after she trusted him and was nice to him. Coop angrily, and rightly, reponds that Yin was never nice to him.
• Verbal Tic: "Buckaw!"

Muffin, The Town President

Voiced by: Dwayne Hill

Description coming soon.

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• Amazing Technicolor Wildlife: He's a green goat.
• Butt-Monkey: He is usually attacked by Carl.
• Everyone Calls Him "Barkeep": Muffin isn't even his real name.
• I Lied: In "" when he promised Yin and Yang that he'd get them into a hip club.
• It's All About Me: He's a bit egomaniacal, often losing sight of what's moral.
• Jerkass: He cares mostly about his publicity and popularity (although he does care for his cat Puddin' Paws), and is even willing to take credit for the deeds Yin and Yang perform in order to attain it.
• Mayor Pain: The mayor of the town and a real jerkass.
• No Name Given: His real name is unknown, as Carl randomly started calling him Muffin the first time he captured him, and everyone else (including the President/Mayor himself) has been using it ever since.

Jobeaux

Voiced by: Bill Engvall

A Redneckistanian practicing Woo Foo, while being disliked by his teachers, Yin and Yang, as a stupid, smelly hick; however, when he finally gets the time to clean himself up, he reveals himself to be a smart, well-groomed young man. After defeating the Chung Pow Kitties, Jobeaux reveals his knowledge of Yin and Yang's disrespect and returns home to marry and live in a castle of diamond-encrusted grits (which Yin was fantasizing about before they met). He has a pet armadillo named Fuzzy Thunder that hides in his mouth, giving him a hick accent.

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• Deep South: He lives in Redneckistan.
• He Cleans Up Nicely: Unlike many Redneckistanians.
• Modest Royalty: Somewhat, despite being a prince, he's rather casual and doesn't show much interest in changing his traditional ways even when he does take up a married life in a diamond encrusted grit fortress.
• Royals Who Actually Do Something: Takes a very active role in his kingdom and seems to be the most active method of defense.
• Warrior Prince: Yes, it's hard to believe, but he's a prince.

The Boogeyman

The Boogie Man is a disco-loving green monster that helps Yin and Yang defeat Pondscüm, Zarnot, Fastidious and Mastermind in "Roboticus Maximus". When the two rabbits were looking for a sidekick to boss around, they chose him. Eventually, they put him in charge over them which lead them to a victory. He became part of the Woo-Foo army they gathered.

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• Afro Ass Kicker: A Woo Foo knight who sports an afro.
• Cool Shades: A circular, pink pair.
• Disco Dan: Boogeyman is a disco-loving green monster, and has a funky speech that's hard for anyone to understand.
• Early-Bird Cameo: Appears as a minor character in The Howl of the Weenie.
• Real Men Wear Pink: His entire outfit (sans the belt, glasses, and shoes) is pink.
• The Unintelligible: "This boogety-bites the big bamma-lamma!", among others. Actually protects him against mind-reading as while someone could read his mind, they still can't understand disco.

Villains

The Night Master

Voiced by: David Hemblen

Billed as a "Dark Overlord in an Evil Class All By Himself", the Night Master is a very powerful and dangerous foe who was responsible for the near extinction of Woo Foo by eliminating all of the Woo Foo knights except for Master Yo. The Sensei managed to turn Night Master's army to stone and sent him into hiding for a hundred years until he tricked Yin and Yang into using Woo Foo in order to free his army. The Night Master appears to be a demonic sorcerer bat (as such, he hates light) of some description and has a liking for Gothic, ostentatious outfits.

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• As Long as There Is Evil: It's possible for about anyone to take up the Nightmaster's reign as long as they prove how terrible of a person they are; so, even if the current one dies, there can always be a replacement. Subverted in "Welcome To The Dark Tomorrow" when the Flame of the Night Master is extinguished. Yo implies this means Eradicus will be the last Night Master.
• Bad Boss: He's very abusive of his underlings. Sometimes it's because he's annoyed with their idoicy, but some moments like his treatment of Coop ^note Coop once asked if he eat a pile of chocolate and the Night Master destroyed it is just him being a jerk.
• The Bad Guy Wins: "The Return Of The Night Master" sees him successfully manipulate Yin and Yang into freeing his army. He fails to kill them and Yo, but accepts them getting away.
• Bat Out of Hell: Resembles an incredibly tall and thin bat wearing a cloak.
• Big Bad: He's the main antagonist of Season 1.
• Casting a Shadow: His abilities rely solely around darkness and shadows to the point he's weakened by sunlight.
• The Comically Serious: It's his short temper and serious nature towards most things that make his interactions with more zany characters all the more comical.
• Curb-Stomp Battle: Easily bests Yin and Yang in "The Return Of The Night Master" with them only managed to escape by holding him off with his weakness to light.
  • In the finale of the first season he dishes out one against Yo, and even when Yo combines his powers with Yin and Yang, the Night Master still defeats all three of them since blotting out the suns has made him stronger than ever.
• Dark Is Evil: He's evil and wears an all-black coat.
• Disc-One Final Boss: He's set up as the show main villain is responsible for the near extinction of Woo Foo^note the most recent instance of it at least and drives the conflict of the first season, but is beaten at the end of the first season and not seen again, outside of a cameo in “Shadowcluck”.
• Drama-Preserving Handicap: Since the only warrior who could match is an old man, if not for his weakness to light the Night Master would be unbeatable.
• Evil Laugh: He laughs like a stereotypically evil antagonist.
• Evil Overlord: He's evil and is the Night Master, the ruler of all evil.
• Evil Sorcerer: He's a sorcerer who's obviously evil.
• Fatal Flaw: He's arrogance and his ego gets the better of him. He does underesimated Yin and Yang.
• Foil: He is a dark reflection of Yin and Yang. He has a lot in common with these two being smart, arrogant, prideful, rude, and egotistical. However, unlike the two, he doesn't have family.
• Expy: Aku of Samurai Jack.
• Furry Reminder: He's a bat, and is sometimes seen hanging upside down.
• The Heavy: The one who started the main source of conflict with Woo Foo being close to nonexistent int the current society and not at all taken seriously by others.
• Knight of Cerebus: Despite some occasionally funny scenes regarding his fashion choices, he's clearly the main cause behind a mass genocide and he's taken in all seriousness whenever he invests in his plans. Rather telling the first time his gets personally involved in "The Return Of The Night Master" the episode actually ends with him winning.
• Lean and Mean: He's as scrawny as a stick figure and is evil.
• The Man Behind the Man: Prefers to act this way.
  • Sends out Ultimoose in the show's opening episode sending him to drive a wedge between Yin and Yang.
  • In "Falling Yin Love" he supplies a robot body to Yuck with gloves that allow him to absorb enough Wu Fu to regain a physical form.
  • Sends Zarnot to pilot a robot doll in "A Toy's Story" to infilitrate the Wu Fu dojo and blow it up. The plan would have worked if Zarnot had simply set off the bomb like he was supposed to.
• Names to Run Away from Really Fast
• No Name Given: He's only referred to as "the Night Master" with his name before he became the current Night Master never being stated.
• Obviously Evil: He's a giant bat who wears a dark cloak and speaks in an eerie voice; also, he prefers looming in the shadows at all times.
• Orcus on His Throne: While he's powerful, he prefers to rely on his underlings.
• Red and Black and Evil All Over: The marks around his eyes are red and his cloak is black with red underneath.
• Red Eyes, Take Warning: Sometimes they are most noticeable when he's in the dark.
• Surrounded by Idiots: He's pretty smart himself, it's just that his minions tend to be much less intelligent than him and screw up his plans. In the finale of the first season he wises up and relies on different underlings than usual (sans Coop since he's avoided screwing up) and they manage to do their jobs right.
• The Trickster: Enough to get Yin and Yang to accidentally free him.
• Weakened by the Light: His main weakness is sunlight which is why he always looms in the darkness to avoid being burned to death.
• Vile Villain, Saccharine Show: A genocidal, power hungry destroyer who now wants to kill two children and their elderly panda mentor and maybe take over the world in the process.
• Why Don't You Just Shoot Him?: The reason he didn't kill Yin and Yang a long time ago because he feared Master Yo would train another group of Woo Foo warriors that would be more competent than the two and he was waiting for the right moment to kill them and Yo at the same time. He maybe right that the two are incompetent, but he underestimated them and their allies.

Carl, the Evil Cockroach Wizard

Voiced by: Jamie Watson

Carl, the Evil Cockroach Wizard (who tends to shout out his name as much as possible and always wants to be called Carl the Evil Cockroach Wizard), continuously schemes to defeat Yin, Yang, Master Yo and the power of the Woo Foo with his insecure genius. He also lives with his overbearing mother Edna, who is a dragon (it makes no sense as to how they are related). Carl is always trying to find a way to impress his mother and out-do his brother Herman. Despite his desire to win his mother's love (or possibly due to his failure to do so), Carl is resentful and has talked back (usually under his breath), made her cry, and even put a spell on her.

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• Affably Evil: He's pretty friendly with the twins even during evil schemes and the two have allied on occasion.
• All of the Other Reindeer: He's the only major villain left out of Eradicorp. Because the front is a coffee shop, a cockroach running around would hurt business.
• Ambiguously Gay: Despite having a flamboyant personality and speaks in a stereotypical Gay Lisp, it's implied that he had a girlfriend.
• Big Bad Wannabe: He actually faces the protagonists far more often per season than the Night Master or Eradicus. He's also a legitimately powerful wizard. It's just that his own foibles and insecurities hold him back.
• Big Little Brother: Carl is taller than Herman, but is younger than him.
• Breaking the Fourth Wall: Has broken the fourth wall on occasion on the show.
• Butt-Monkey: Despite being the most frequent villain on the show, he's frequently on the other end of the stick when it comes to being a walking punching-bag.
• Card-Carrying Villain: Loves to show off he is evil.
• Catchphrase: Constantly shouting his full title as Carl, the Evil Cockroach Wizard, usually after a hammy speech about the evil he plans to commit.
• Color-Coded Eyes: Green eyes, possibly indicative of his jealousy of his brother and/or to invoke Emerald Power.
• Deadpan Snarker: Easily one of the more sarcastic characters.
• Disappeared Dad: While seen interacting with his brother and mother, no mention of a father.
• Enemy Mine: One of the only villains to team up with Yin and Yang. He even considered a Heel–Face Turn in one episode but was rejected.
• Evil Is Petty: It's no exaggeration to say that most of Carl's motivations behind his evil schemes is his own inherant pettiness. This is even how Yin and Yang get him and Herman to end their truce in "Family Day".
  Yin: We need to get them fighting again... but how?
  Yang: What's that emotion I have that always makes me wanna dump on your day?
  Yin: Oh, oh! Petty jealousy?
• Evil Sorcerer
• Ineffectual Sympathetic Villain: His failures of impressing his mom and being bullied by his older brother make him quite sympathetic.
• Line-of-Sight Name: Carl is really bad at coming up with fake names, he just comes up with "Carla" or "Carlos".
• Not-So-Harmless Villain: He's powerful enough to take out the Night Master's Elite Mooks in droves during the season one finale. He is also the member of the Rogues Gallery that has the most episodes centered around him.
  • Lampshaded a few times. Yang points out that while he is dangerous, their insults make him mad and throws him off.
  • Another example is where Carl switches minds with Yo. Yo uses Carl's powers to fight back against brother Herman, revealing Carl is as strong as his brother.
• Paper-Thin Disguise: How Yin and Yang never seem to see through them is a mystery, as almost all his plans include the use of a disguise at some point, often more than once an episode, occasionally involving crossdressing, and at least once it wasn't even necessary.
  Herman: Exactly why do we have to dress like plumbers to sneak into a bathroom window?
  Carl: You know me, I like to play dress-up.
• Sibling Yin-Yang: With Herman.
• Supreme Chef: He proves to be an excellent chef in "Get Off My Back" where he's so offended by the site of Yin and Master Yo eating frozen dinners that he prepares them a gourmet meal.
• Sword and Sorcerer: When cooperating with Herman, with him as Sorcerer.
• Tragic Villain: Behind the destructiveness and thirst for power, Carl is just a painfully lonely, emotionally crippled man desperately yearning for the love of his mother.
• The Unfavorite: His mother prefers Herman over him, due to his brother's success.
• Weaksauce Weakness: His weak self-esteem and short temper means that insults throw him off his game pretty easily. Yang exploits this very often.
• Who's Laughing Now?: Pulls this to Yin after she humiliates him in "A Bad Case Of The Buglies"
• Woobie, Destroyer of Worlds: It is implied on numerous occasions that his failed attempts at being a villain efficient and physical abuse of his older brother, is resentment that motivates him to try to defeat Yin and Yang to impress his mother.

Eradicus

Voiced by: Jonathan Wilson

A mighty Gryphon who is bent on destroying Woo Foo. As revealed in "Welcome To The Dark Tomorrow", he is in fact the first and original Night Master. After his demise (of an unknown cause), other beings of darkness took on the mantle of evil he left behind including an unknown snake lady and the bat-creature Yin and Yang faced in season 1. His deceased minions posed as the ghosts of the Woo Foo Elders to manipulate Yang into collecting the items of power needed to revive him. Tricking Yang into throwing the items into the Night Master's fireplace at the stroke of midnight, Eradicus was instantly resurrected.

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• Attack of the 50-Foot Whatever: He's miles taller than about any other person presented, only seeming smaller than the Halloweenie he summons and can stand atop of.
• Bad Boss: He regularly abuses and belittles his allies, even striking them down with his power if they pose a logical flaw in his plans. It's no wonder Ella Mental gets the bulk of it.
• Big Bad: Upon being resurrected due to Yang being manipulated by his minions, Eradicus became the main threat to the heroes for the rest of Season 2.
• Card-Carrying Villain
• Corrupt Corporate Executive: As the head of "Eradicorp"
• Didn't Think This Through: He planned to unleash the Weeniehowl by having it drain people's fears: while successful in creating a large monster that could destroy the city, he also wanted to hear the screams of terrified people (hoping to transform his favorite holiday back into a terrifying affair); however, since the monster completely drained everyone's fears, they had no reason to care what was going on and were completely indifferent to it.
• Early-Bird Cameo: First seen in "Doomed To Repeat It".
• Evil Overlord: The previous Night Master.
• Names to Run Away from Really Fast: His name could easily be interpreted as "eradicate", which means to destroy completely; he especially lives up to his name after he successfully brings on the Dark Tomorrow which is the show's equivalent to the apocalypse.
• Large and in Charge: He completely towers over anyone else in his vacinity, especially compared to the meager stature of his minions.
• Large Ham: Lots of it.
• Names to Run Away from Really Fast: His name is derived from the name "eradicate".
• Our Gryphons Are Different
• Power Echoes: Almost always has the presence of two voice speaking at one time, though it's especially noticeable whenever he shouts.
• Suddenly Shouting: To add onto his hamminess, he has a bizarre habit of starting off his sentences in a flat and calm tone until randomly shouting at the top of his lungs by the end.
• Vocal Evolution: Deep and gruff voice in his first appearance.
• Villains Out Shopping: Aside from being evil, he loves polka and to throw slumber parties with his minions

Ella Mental

Voiced by: Linda Ballantyne

A female villain who can read minds. She is the smartest one of Eradicus's minions, though her blunt corrections often get her zapped by Eradicus. Eradicus also forced her into tuba lessons, and can play polka music.

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• Battle in the Center of the Mind: After being sucked into the Box of Infinite Trapitude, she has a brief mental confrontation with Yin and Yang
• Dark Action Girl: She's works for Eradicus and is an action type.
• Deadpan Snarker: Normally in response to the other's incompetence.
• Designated Girl Fight: More often then not, she and Yin will end up in a one-on-one battle.
• Evil Genius: The smartest out of the group and is far more likely to plan ahead and approach situations with common sense before jumping head of herself.
• Facial Markings: She has a star and moon design on her cheeks.
• Fiery Redhead: Mostly averted as she's easily the most level headed member of the team and a brunette, but does have a tendency to become incredibly malicious and loud if angered.
• Fingerless Hands
• Flight: Is one of few characters shown to have this ability.
• Magic Staff: Regularly holds a long staff with a glowing red orb at the top.
• Mass Hypnosis: As demonstrated in "Division Quest", she's able to shoot out strong enough psychic waves to hypnotize multiple people at once.
• Mini Dress Of Power: The only girl on Eradicus' team and a sports a earthy brown tunic dress.
• Pstandard Psychic Pstance: Almost always places both hands to her forehead before utilizing her abilities.
• Psychic Block Defense: The best method of defense against her psychic powers. "Mind Games" has Master Yo trying to teach Yin and Yang how to set up mental walls to keep Ella Mental from using her most useful skill, mind reading.
• Psychic Powers: Is able to mind read and levitate items and harbors a great deal of power from being within her own mind as shown in "Mind Games" when she nearly overpowers Yin.
• Proud Beauty: Holds a lot of satisfaction in her attractiveness and doesn't take it well when Yin thinks she's not that hot.
• Punny Name: Sounds like "elemental".
• Sarcastic Devotee: She's behind Eradicus' cause but won't hesitate to poke holes in his plans with a very dry wit.
• Telepathy
• Vain Sorceress: Less magic and more psychic powers, but still fits.
• Women Are Wiser: Consistently the most level-headed and sensible member of Eradicus' organization.

Indestructo-Bob

Voiced by: Tony Daniels

A villain who has nearly impenetrable armor and can bowl over nearly anyone. He can be best described as unintelligent.

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• Affably Evil: Generally pleasant and friendly to everyone due to his stupidity.
• The Brute: An indestructible being who can deflect attacks, roll over enemies and send his enemies flying through the air with one punch or kick.
• Dumb Muscle: Emphasis on dumb. He's very strong and the muscle of the group but is as dumb as rocks.
• Nigh-Invulnerability: He's indestructible, hence his name.
• Punny Name: His name is a play on indestructible.
• Third-Person Person: He refers to himself as "Bob".

Rubber Chucky

Voiced by: Peter Cugno

A villain who can stretch himself into any shape and any person. He loves cracking bad jokes. His name is a portmanteau of the gag toys Rubber Chicken and Rubber Ducky.

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• Beard of Evil: The only one among his teammates with a beard and is a mook of the Season 2's Big Bad.
• Pungeon Master: He has a knack for telling bad jokes.
• Punny Name: His name is a play on "rubber ducky".
• Rubber Man: A being made entirely of rubber and thus the ability to stretch.
• Voluntary Shapeshifter: Thanks to being a Rubber Man, he has the ability to contort himself into any shape he wants.

Molecu-Lars

Voiced by: David Berni

A villain who can shapeshift and regenerate his limbs.

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• The Ahnold: He's speaks in a Austrian-accent like Arnold Schwarzenegger.
• Chuck Cunningham Syndrome: Introduced physically in "Welcome to the Dark Tomorrow" but never seen again.
• Flight: He has the ability to levitate.
• Good Thing You Can Heal: He has the ability to regenerate his limbs.
• Punny Name: His name is a play on "molecular".
• Voluntary Shapeshifter: He possesses the ability to shape shift.
• What Happened to the Mouse?: Mollecu-Lars fled after Eradicus was destroyed in "Welcome To The Dark Tomorrow", and his current status, alive or deceased, remains unclear.

Brother Herman

Voiced by: David Berni

Carl's black-hearted, sadistic, selfish and evil ant brother, Herman, is a tyrannical ant warrior who rules his kingdom with an iron fist, a diabolical mind, and impeccable table manners. He is also quite the mama's boy. He attempted to take over the world until Master Yo stopped him.

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• Aloof Big Brother: To Carl. Though it's never outright stated that he is the elder of the two, it's implied here and there, and he certainly fits the trope.
• Big Brother Bully: He's Carl's older brother and always bullies him any chance he gets.
• Disappeared Dad: No one knows what happened to him and Carl's dad.
• Even Bad Men Love Their Mamas: He treats his brother like dirt, but does appear to actually love his mother.
• Evil Overlord: He's a ruthless tyrant that's anything but nice.
• Eviler than Thou: To his younger brother Carl.
• A Father to His Men: Subverted. "Please, soldier, don't cry... because weakness is a punishable offense! THROW HIM IN THE DUNGEON!!!" Although, it could also mean that the dungeon is where his soldiers rest and train to be super soldiers
• Faux Affably Evil: Pretends to be nice to his mother even when treating Carl like crap.
• Jerkass: Herman is a violent brute who beyond his love conquest is also complete jerk to his brother, beating him any chance he gets. Even his underlings aren't safe.
• Momma's Boy: A trait he and his brother share.
• Multi-Armed and Dangerous: He has four arms, making him capable of Quadruple Wielding.
• Multi-Melee Master: Swords and hammers.
• Nigh-Invulnerability: He's an ant, yet can resist lots of heavy blows from blunt weapons to even magic.
• Oh, Crap!: When he finds out that the potion to take away his allergies no longer works because all the potion did was conjure up a clothespin over his nose, and Yin flicked it away easily.
• Pet the Dog: When Yin and Yang disguise themselves saying Herman was voted dictator of the year in order to get Herman to set up a party so they could still back a Tome of Eldritch Lore, Herman was actually in the process of thanking the two of them until he realized they were robbing him.
• Satellite Character: While Carl appears plenty of times without him, it's noteworthy that he almost never appears in an episode without Carl making at least a cameo, if not sharing the spotlight. His character is largely defined by comparison with his brother. It's particularly jarring since he's mentioned as having conquered most of the world, and is played up as being a more competent villain overall.
• Sibling Yin-Yang: With Carl.
• Super-Strength: His four arms pack a surprising amount of wallop.
  • Strong Ants: His troops aren't pushovers exactly either.
• Sword and Sorcerer: The Sword (or Hammer, or Fists) when paired with Carl.
• Villain Decay: In his debut appearance, Yin and Yang couldn't scratch. But since he forgot to level grind while they trained, the third time he appears they can defeat him and he doesn't pose much of a threat than his brother.
• Violent Glaswegian: He's a villain who for some reason has a Scottish accent.
• Weaksauce Weakness: He's allergic to panda fur. Both physically and mentally allergic to it.

Ultimoose

Voiced by: Tony Daniels

Ultimoose is the ultimate Night Master lackey: tough as nails, a master at Moose fighting, and really, really dumb, despite his shortness and strong antlers. He seems to offer work under the Night Master but is merely a dim-witted pawn.

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• All of the Other Reindeer: "Deja Foo" sees the various villains hold a picnic scavenger hunt. Guess who wasn't invited.
• Battle Cry: "HOOH!HAAH!HOOH!"
• Boisterous Bruiser: He constantly boasts how buff he is all the time.
• Butt-Monkey: He's just as bad as Carl when it comes to this.
• Dumbass Has a Point: When Yin and Yang manage to get into massive credit card debt at a mall built around their dojo, with cards Ultimoose gave them while in a Paper-Thin Disguise, after he reveals the mall was a scheme by the Night Master, he reveals his own identity. And then points out the mall and the credit cards were clearly named after him and that it was painfully obvious the whole thing was a trap.
• From Nobody to Nightmare: In "Deja Foo" after becoming the Night Master, (calling himself the Night Mooster) and killing Yin and Yo and nearly killing Yang as well.
• Harmless Villain: While he can be genuinely dangerous at times (see From Nobody to Nightmare), Ultimoose absolutely cannot compare to Yin, Yang, and Yo in strength and ability as they are leagues above him. He usually has to attempt to outsmart them instead, but he isn't any good at that either, as he is a massive idiot. Lampshaded by Yin and Yang in the final episode.
• Hated by All: No one, hero or villain (with the possible exception of Coop's mom in the final episode), can stand Ultimoose. Only the Night Master can even tolerate working with him, and even then, the Night Master makes it clear that he only keeps Ultimoose around as long as he serves a purpose.
• Ineffectual Sympathetic Villain: Subverted. While his Butt-Monkey status is just as big as Carl's, Ultimoose has fewer sympathetic qualities than the latter. Then you see what Ultimoose would do with true power (again, see From Nobody to Nightmare) and you realise he deserves every bit of his Butt-Monkey and his Hated by All status.
• Invincible Villain: Typically, he is the opposite, but in "Deja Foo", during his brief stint as the Night Master, he became so unbelievably powerful that he is able to effortlessly defeat both Yin and Yo simultaneously in a few seconds twice (the second time killing them) and Yang is so helpless to stop him that he has to reverse time itself to be able to stop him. Thankfully, afterwards he is back to his regular wimpy self.
• Large Ham: He tends to be over-dramatic, especially when it comes to manliness.
• Moose Are Idiots: A Dumb Muscle antagonist who happens to be a moose.
• Red Eyes, Take Warning
• Starter Villain Stays: Ultimoose is the first villain Yin and Yang fought in the series and in said first appearance Master Yo effortlessly beats him off-screen. Despite that, he continues serving the Night Master and fighting Yin & Yang.
• Straw Misogynist: Ultimoose says a lot of sexist things about women, most commonly by using "lady" as an insult. He is to Yin what Saranoia is to Yang.
• Third-Person Person: It will be easier to count the times where he doesn't says sentences in the third-person.

Yuck

Voiced by: Scott McCord

Yuck, a turquoise-green rabbit with terrible hygiene, is an entity formed from Yin's obsession with control and Yang's aggression. As a disgusting, mutant rabbit, Yuck wants more than anything in the world to be the greatest, most powerful Woo Foo Knight of all time.

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• All Your Powers Combined: Upon his creation, Yuck has knowledge of everything Yin and Yang can do, be it Might or Magic, as well as abilities that go far beyond their current levels.
• Ambiguous Gender: Yuck seems to personally identify as male and uses masculine pronouns but due to being the halves of two opposite-sex twins he has what is essentially a Boy Half and a Girl Half as discovered in "Personality Problem". He even uses a bathroom with a question mark on it in his debut episode.
• Arrogant Woo Foo Guy: He's a power-hungry, narcissistic jerk willing to gain power by any means necessary.
• Ax-Crazy: Adapting Yang's aggression, Yuck is as equally if not more addicted to combat to blood thirty degrees. He's made a habit of terrorizing entire towns and assaulting civilians for his own joy-and that's without mentioning his borderline manic expressions.
• Badass Adorable: He's a small and cute if somewhat scruffy and unkempt rabbit child and one of the deadliest foes in the series, ranking at a Level Two upon his creation and capping at Level Five by the end. Not to mention that he's possibly the most powerful Woo Foo knight in existence, nearly killing Master Yo the first time in a mostly one sided fight.
• Back from the Dead: Due to the nature of his existence, Yuck can be created and destroyed and has bounced back from being essentially beamed to death until he was merely a wraith and shrunken down until he ceased to exist. With enough concentrated-and misused-magical energy being generated from Yin and Yang, he can come back to life.
• Berserk Button: People not listening to his orders is the quickest way to get on his nerves, especially if he's already riding the high of being in charge. The Fooplicates were met with violence at the slightest argument and in "Personality Problem" he sics the gathered crowd on Dave for pointing out a logical flaw in one of his rules.
• Big Eater: Eats an entire pie and a pizza in his debut episode in just a few bites, normally making a mess along the way.
• Bitch in Sheep's Clothing: Very much so in "Falling Yin Love" as his Brett persona, presenting himself as a dreamy and romantic boy with the explicit purpose of taking advantage of Yin's affection. He only ever drops the act when Yang is around.
  • In "Camp Magic Pants" he doesn't break character once when he's controlling the Headmaster, coming off as a kind if somewhat airheaded mentor figure until Yin does what he wants.
  • Cruelly subverted in "Upstanding Yuck" as Yin and Yang presume he's being this and winning over the townspeople to unveil an evil plot when in reality his kindness was entirely genuine.
• Blood Knight: Yuck loves fighting though definitely to more lethal degrees than his counterpart Yang.
• Blow You Away: "Yuck-i-cane!"
• Boomerang Bigot: Yuck is a creature who not only practices Woo Foo but is made out of it. And yet he'll still address Yin and Yang as the popular insult "Woo Fools" and the first rule he implements in "Personality Problem" is that "Woo Foo sucks again."
  Yuck: Rule number one: Woo Foo sucks again!
  Crowd: Woo Foo sucks!
  Dave: Aren't you Woo Foo?
• Calling Your Attacks: Not nearly as much as Yin and Yang do though he will shout out his signature move "Yuck-i-cane" whenever he summons it.
• Control Freak: Yuck is obsessed with power in the physical and mental sense with some of his plots being to claim control over anything he can get his hands on. In "Imperfect Fooplicates" he controls an army of Yin and Yang clones that he's quick to punish with violence at the slightest sign of disobedience and in "Personality Problem" he's after a crown that bestows a level of vague political power over the town.
• Demonic Possession: He takes control of the Headmaster's body in "Camp Magic Pants", only revealing himself towards the end once the pants statue has been awakened. It's never explained if this a Woo Foo related power or if something Yuck can simply do on a whim.
• Energy Ball: Is able to devise a ginormous sphere of green energy on one finger not only strong enough to implode an entire town but be seen from space.
• Evil Counterpart: To both Yin and Yang.
• Evil Laugh: A short, fast, somewhat nasaly chortle.
• Fangs Are Evil: Has spiky teeth and is the evil opposite to both Yin and Yang.
• Good Costume Switch: In "Upstanding Yuck", he wears a non-ripped shirt, seems to have bathed himself, and slicks back his fur.
• Green and Mean: What better way to describe an egotistical Woo Foo mutant whose frequently called a jerk by his enemies?
• Heel–Face Revolving Door: Also in "Upstanding Yuck" he becomes a good guy by having a group of hooded figures beat goodness into him. Yin and Yang don't trust him of course and follow him around, ambushing him whenever his words sound like a threat. They're proven wrong in the end, realizing too late that Yuck was good all along and that their actions have only turned him back to his old ways.
• Hiccup Hijinks: The thing that defeats him at the end of "Imperfect Fooplicates". Despite his incredibly increased power after inhaling a number of Fooplicate flakes, this also gave him a bad case of hiccups that make him lose control of his abilities and ultimately defeat himself.
• Hidden Depths: Aside from his hidden potential to be a genuinely good person, Yuck shows an impressive display of skills when helping the citizens around town in "Upstanding Yuck". He apparently knows how to fix a flat tire and has something of an artistic side with a giant statue he made entirely by hand to commemorate his friendship with Yin and Yang.
• In Touch with His Feminine Side: At least as far as Yang is concerned. Yuck will sometimes get a hold of a powerful item like Yin's Fooplication Charm Bracelet or the Crown of Civic Authority and shows no shame in wearing it if it guarantees him a power advantage. Yang, as well as Yin with Yang's aura, is quick to mock Yuck for his willingness to use dangerous artifacts in the form of typically girly accessories, unaware of just how dire the situation has become because of it.
• Jerkass: A rude, selfish, arrogant, menace with a manipulative streak a mile wide. Yin and Yang don't regularly call him a jerk for nothing.
• Jerkass Has a Point: Towards the end of "Upstanding Yuck" when Yin and Yang push him too far and he reverts back to his old self, Yuck delivers a speech about the twins' hero complexes and how that's the only real reason they wouldn't just let him be.
• Killer Rabbit: An almost literal version.
• Large Ham: Yuck is downright tame compared to some other villains, but he can certainly bring up the ham whenever he makes an entrance.

  Yeah baby, I'm back!

• Magic Knight: Dual-wields the Might and Magic capabilities of Woo-Foo.
• Made of Evil: Made from the negative qualities of Yin and Yang (specifically bossiness/need for control and impatience/violent streak).
• Manipulative Bastard: Stands out amongst the other villains for playing the long game to get his way rather than result to one quick trick-Yin often being the victim of his lies. In "Falling Yin Love", he practically woos Yin into falling in love with him through a combination of sheer charisma and the Brett suit disguising him completely. Also in "Camp Magic Pants" when he's able to use the body of the Headmaster to his advantage and yet it's shown he still managed to manipulate Terry Otter post reveal.
  • This skill ends up being to his detriment in "Upstanding Yuck" when his genuine devotion towards turning his life around is seen as a ruse by Yin and Yang.
• Master Actor: Unlike most of the other villains who tend to poorly disguise themselves or just barely be able to trick the twins, Yuck is uncannily good at sticking to a role and hardly ever breaks character.
• Master of Disguise: Earns this rank by not just wearing a mask and costume like many other villains or, in Carl's case, a Paper-Thin Disguise, but by pulling some pretty elaborate stunts like a robot suit or possessing a body.
• Never My Fault: Rarely ever takes the blame for his failures, especially in "Personality Problem" where he blames Yin and Yang for "being on top of their game" and towards the end of the episode where he claims his girl half's idea is the reason he lost.
• The Pig-Pen: He doesn't call himself "Yuck" for nothing.
• Pint-Sized Powerhouse: He's the same size as Yin and Yang and is as deadly, if not moreso, than either of them. Even out of his muscular form, he can support heavy tree branches with one hand and lift mile high statues like it's nothing.
• Playing with Fire: Is capable of doing the Fists of Fire when he's first made, a Level 2 Woo Foo move, mind you.
• Punctuated! For! Emphasis!: In his fight with Master Yo, each of his word emphasized with punches.
  Master Yo: You've mastered the Fists of Fire? That's a level two Woo Foo move!
  Yuck: THEN IMAGINE-WHAT I'LL BE ABLE TO DO-ONCE I TAKE! ALL! OF YOUR-WOO! FOO! KNOWLEDGE!
• Sickly Green Glow: His magic is this color.
• Slasher Smile: Somewhat of a default expression if he isn't frowning, especially helped by his sharp teeth.
• Smug Super: Always feels the need to point out how he's a Level 5 Woo Foo Warrior and he's still hungry for more power.
• To Be a Master: A villainous variant as his ultimate goal is to become the most powerful Woo Foo Knight ever.
• Third-Person Person: On occasion, he'll end a threat with his own name, such as shouting phrases like "So swears Yuck!" or "You'll be no match for Yuck!".
• Uncleanliness Is Next to Ungodliness: His foulness is a clear display of his evilness. When he goes good in "Upstanding Yuck" it's the first we see him properly groomed but post Heel–Face Revolving Door, the filth manifests again on his fur.
• Unreliable Narrator: Yuck's flashaback sequence in "Upstanding Yuck" has him introduce the reformed grim reapers as stern but well-meaning mentors who gentely informed him about his "wicked intent". The part Yuck leaves out is that teaching him "the error of his ways" included relentlessly beating him up for possibly days on end.
• Vocal Evolution: His voice is mildly inconsistent during season one at a more nasally pitch but what could be considered his official voice settles early into season two onward.
• Wind Is Green: His signature move "Yuck-i-cane" often manifests with spiraling green winds, though it could also be an extension of his magic that already has a Sickly Green Glow.

Smoke

Voiced by: Linda Ballantyne

A hyper-active female who was, supposedly, Yang's girlfriend. It turns out she was using him to fight against her brother, who in turn, captures Yin to fight against Smoke. Yin and Yang eventually capture the two into Smoke's Prison Prism.

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• Affectionate Parody: Smoke and Mirrors capture Yin and Yang and force them to fight in a style similar to Pokémon while the characters themselves are one of anime. Smoke dating Yang is a parody of Pokémon: The Series ' usual Power of Friendship theme. She is dressed in Sailor Fuku and wields a large Buster Sword-like blade.
  • Smoke loses the Pokémon angle in later appearances, becoming an entirely different parody that's only more ironic considering her VA (see below).
• Amazing Technicolor Population: Yellow skin.
• Ambiguously Human: Resembles a human more than anyone else, only excluding her yellow skin and lack of a nose, though she's never specifically stated to be one.
• Ax-Crazy: A number of the things she randomly yells between her lectures range from bizarre to downright terrifying threats towards people who may be annoying her.
• BFS: Being a walking anime parody, her sword is as big as Guts and Cloud Strife.
• Cute Little Fangs: Has two sharp teeth that come out of her mouth.
• Dark Action Girl: She's evil and is a powerful swordswoman.
• Dating Catwoman: Yang, a hero, dated her in her debut appearance.
• Evil Redhead: She's one of the more recurring villains and has bright red hair.
• Fiery Redhead: Can't go very long without screaming a threat, normally finishing with a giggle.
• Impossible Hourglass Figure: Her waist is as thin as her arms and has visible hips and bust.
• Large Ham: Speaks like this in a vein to hammy anime dubs.
• Magic Skirt: Despite doing a great deal of fighting, her skirt stays in place as though it were cloaked in starch.
• Motor Mouth: She has a tendency to speak incredibly fast to the point where no one can understand her.
• Noblewoman's Laugh: A subtle case as her laughs aren't much beyond a giggle though she always holds her hand up to her mouth whenever doing so.
• The Noseless: She is drawn without any nose like Lina.
• No Indoor Voice: In addition to talking quite fast, she also has a tendency to scream almost everything she says.
• Punny Name: With her brother Mirrors, a play on Smoke and Mirrors.
• Red Eyes, Take Warning: One of the most violent and unhinged villains with blazing red eyes.
• Revenge: Due to Yang putting her and Mirrors inside her own Prison Prism and having fun shaking it while they were sealed, Smoke has been seeking vengeance against him ever since and has attempted with a few plans to do away with him.
• Sailor Fuku: Going along with an embodiment of anime parodies.
• Unexplained Recovery: Towards the end of "Stuck", Smoke got flung to a volcano, where she accidentally got herself scorched by the lava after opening a hidden door, yet is shown to be perfectly fine in "Worked Stiff", her next appearance after that.
• Verbal Tic: Normally finishes her statements with a "tee hee!"

Mirrors

Voiced by: Jonathan Wilson

Smoke's rivaled brother. When Smoke uses Yang in the tournament, Mirrors obtains Yin to fight her. Yin and Yang managed to use one of the Forever Friend Prisms to imprison Smoke and Mirrors. Mirrors' hairstyle resembles the hairstyle of Goku from Dragon Ball Z. He appears to speak in a way mocking most anime, by stopping and starting at odd intervals.

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• Affectionate Parody: Smoke and Mirrors capture Yin and Yang and force them to fight in a style similar to Pokémon while the characters themselves are one of anime. Mirrors mimics Tuxedo Mask while having a vague resemblance to Goku.
• Amazing Technicolor Population: Green skin.
• Ambiguously Human: Bares a humanized appearance much like his sister's though it's never clarified what he actually is.
• Anime Hair: The kind of spikey hair you'd expect from an anime character.
• Captain Obvious: "They are rabbits: Yin and Yang."
• Cute Little Fangs: A lot like Smoke's.
• I Know Karate: As he very well points out with a series of poses before disappearing in his introduction.
• Out of Focus: The season he's introduced he just as quickly gets pushed aside in favor of his sister Smoke taking most of the screentime.
• Punny Name: With sister Smoke, a play on Smoke and Mirrors.
• Something about a Rose: Flings one into the ground before his introduction, copying a particular anime.
• Walking Shirtless Scene: He's practically half dressed compared to his sister.

Saranoia

Voiced by: Linda Ballantyne

With an outfit & magic wand for every occasion, Saranoia is a powerful sorceress and mistress of disguise. Deeply sexist and obsessed with female rights, she is determined to free Yin from studying Woo Foo and take her in as her disciple. She had a terrible childhood and always thinks men are like her lazy brother Mark and her boy-favoring wizard father, who she mistakes Yo as, just as she mistakes Yang for Mark.

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• Alpha Bitch: As her popular tween girl persona, Miranda. Saranoia's never been exactly nice but she's especially catty and judgmental during "The Truth Hurts" and talks down to Lina for being a farmer.
• Amazing Technicolor Population: Light purple skin.
• An Ice Person: Becomes one in the episode "Scarf it Up". Her wand of choice even turns her to ice and lets her freely manipulate the weather.
• Bad Boss: Often yells at and abuses G.P., her gnome assistant.
• Cloud Cuckoolander: Depending on the episode. Sometimes she just hates Yang, other times she assumes he is actually her brother, and she once even believed that Master Yo was her father.
• Crystal Ball: Similar to Carl, Saranoia has her own crystal ball that lets her spy on the twins as she pleases.
• Demoted to Extra: In Season 2. Several Season 1 villains would lose prominence but still get an episode or two; she only got a handful of cameos.
• Does Not Like Men: Believes that all men, whether good or not, are all bad.
• Evil Sorceress: She trained since youth in the ways of witchcraft.
• Flanderization: Her misandrist traits become her singular trait after her later appearances and she becomes more insane over the course of the series.
• French Maid: In "Bad Nanny Jamma", she tries to get into the dojo this way. However, the given wand forces her to clean every mess before she can even try to get Yang.
• Freudian Excuse: Having a boy-favoring wizard of a father who made her study all the time practically shaped who she is today.
• Hot Witch: Insanity be damned, Saranoia is still a statuesque, curvy sorceress often decked out in fetish costumes varying from sexy pirate with a midriff exposing top and miniskirt to a French Maid in fishnets.
• Hypno Trinket: The scarves she passes out in "Scarf if Up" have mind control properties that causes people to become more reckless and irresponsible.
• Impossible Hourglass Figure: Much like Smoke, Saranoia's physique comes with a cinched waist, large breasts, and massive hips-further emphasized by her variety of costumes.
• Join or Die: Saranoia desperately wants to take on Yin as a disciple but will immediately try to eliminate her as well once she sees Yin favors protecting her brother.
• Magic Wand: Has a wide assortment, most of which based on a household objects. Besides allowing her to shapeshift into a certain form (along with her gnome minion), it lends her appropriate abilities. For example, a lipgloss wand turns her (and her gnome minion) into a tween while the broom wand gives her a French maid outfit (along with turning Fred into a poodle.) The wand also influences her magic, as she could only use the broom wand to clean (at least until there was nothing left to clean), which the twins exploited.
• The Noseless
• Pirate: In "The High She-as" (fake beard included).
• Psychological Projection: She is CONVINCED that Yin’s situation with Yang and Master Yo is exactly like her relationship with her father and brother. Despite her minion pointing out the differences.
• Revenge: Is on the receiving end of this when G.P. (who she often abuses) gains a power boost. The first thing he does is shove her face in her dinner. He does it again just as she's done cleaning up.
• Squick: In-Universe, her obsession with Yin. Though it becomes saddening when one understands she actually believes she is helping Yin and trying to prevent her going through the same abuse she went through as a young girl despite Yin actually choosing to study magic instead of being forced.
• Tragic Villain: Many of her actions are a reaction to her years of childhood trauma, so much so that she projects her life issues onto Yin as some warped way to mend her own issues.
• The Unfavorite: Her father preferred her brother, brainwashed her to study magic against her will and gave her a hatred of men so deep she became homicidal.

Zarnot

Voiced by: Jamie Watson

Once Yang's favorite toy, Zarnot is an evil action figure brought to life by the Lie Fairy, hell bent on destroying Yang.

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• Brought to You by the Letter "S": He has a stylized "Z" around his chest area.
• Butt-Monkey: At times, Zarnot often gets flung away, usually by Yang, sometimes even when he's disassembled. A small gag in Season 1 even had him thrown into a toy box.
• Card-Carrying Villain: He wants to be one.
• Crazy Jealous Guy: A platonic version. It has been revealed in "Dummy Up" that Zarnot still desires Yang's affection and attention, and seems to grow insane jealousies towards any other toy that Yang might be playing with (such as Yochop). Whenver Yang ignores him, he seems to want Yang's attention more, and is willing to go far lengths to attain it.
• Dark Is Evil: His main color scheme are dark blue and black.
• Evil Is Hammy: He uses the same villain cliches.
• Humongous Mecha: Subverted for most of the time, but sometimes displays the ability to grow huge.
• Living Toys: The evil type. He's like a Decepticon knock-off with the personality of Talking Tina.

Pondscum

Voiced by: Jonathan Wilson

A street, Swedish, fish inside a robot suit. His being a "Swedish fish" appears to be a reference to Swedish Fish candy. He is obsessed with "bling-bling", and will get it at all costs; however, he truly carries a Swedish accent.

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• Bodyguard Babes: His two henchwomen, the Blixens.
• Disco Dan: Loves to disco dance.
• Funny Foreigner: A Swedish fish who loves disco.
• Gold Makes Everything Shiny: Pondscum even wears a gold made suit. He is obsessed with "bling-bling", and will get it at all costs. Even his sidekicks are equipped with gold armor when a battle gets serious.
• Insistent Terminology: Insists that people pronounce the U with the umlaut in his name properly.
• Light Is Not Good: He wears shiny gold, but is a definite antagonist.
• Negative Continuity: He was revealed to be a frog in "Deja Foo", but in "Welcome to the Dark Tomorrow" was a fish again.
• Sidekick: The Blixens, two beautiful, leggy women who seem to be a parody of Lovely Angels.
• Totally Radical: He makes a big show of talking in slang when partying or committing villainous acts, though he speaks far more normally in his Swedish accent in private. Yang outright calls him a poser.

Chung Pow Kitties

Are little, furry and adorable kittens (at first glance), but they are really evil and heartless ninjas. They usually wear dresses red, blue and green.

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• Badass Adorable: As evil as they are, you can't deny their adorable nature or skill in martial arts.
• Cats Are Mean: A trio of adorable-looking kittens who tend to cause trouble to the heroes.
• Evil Divas: The three of them form a rather famous band that more or less seems like a cover job for their crimes.
• Expys: Of both Hello Kitty and The Powerpuff Girls, but as villanous pop-star ninjas.
• Pint-Sized Powerhouse: They're small kittens, but they pack a punch.
• Terrible Trio: A trio of cats who commit crimes.
• The Unintelligible: They only say "meow" yet they manage to be an incredibly popular band.
• Took a Level in Badass: They manage to learn something akin to the Woofoo Aura technique; the trio of kitties combine their auras to make an energy cat known as the "CPKougar."
• Villain with Good Publicity: Due to being a popular band, they're easily able to deceive people and get away with their schemes.

Kraggler

Voiced by: Tony Daniels

A gargoyle who is about a "bazillion" years old, Kraggler used to be a great and powerful warrior and Master Yo's arch enemy. Reduced to a feeble old man, after he broke the time traveling hour glass he got the power to drain the youth from anything, or give his age to anything.

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• Arch-Enemy: Was one to Yo back in his glory days.
• Grumpy Old Man: He's default form if he isn't much younger.
• Our Gargoyles Rock: He's a sentient, magical gargoyle creature who becomes stronger if he can retain his youth.
• Plot-Relevant Age-Up: Does this to Yin and Yang which later turns into Rapid Aging for the duo.
• Senior Sleep-Cycle: Downplayed at best.
• Time Master: The hourglass he had can influence time travel and grants him the ability to influence one's age.
• Totally Radical: Whenever he's in the form of his younger self.

Mastermind

Voiced by: Peter Cugno

An evil mittens-wearing wizard who was a big threat years ago; now he's just a brain looking for a body to regain his reign of evil.

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• Diabolical Mastermind: Mastermind is power hungry, and wishes to gain full domination of the planet as he did in the past.
• The Ditz: "I was the ruler of an empire that covered over twelve continents in a world that only had seven!"
• Evil Brit: He has a British accent and is a Diabolical Mastermind.
• Grand Theft Me: Pulls this on Yang by tricking him into accepting a magical coupon. It's one of few ways Mastermind can even be a physical threat and Yang's strong, athetlic build proves to be the perfect vessal.
• Green and Mean: He emits green flames and is one of the show's antagonists.
• Hair-Trigger Temper: He also has a short temper, which results that his head is engulfed in green flames which are usually extinguished by emergency water sprinklers.
• No-Respect Guy: "Roboticus Maximus" has Mastermind aligning himself with Fastidious, Pondscüm, and Zarnot, yet he gets constantly disrespected throughout the episode, mainly with Zarnot giving him formations that are insults towards him that the other two laugh as well as Mastermind finding the three to be incompetent to work with.
• Red Eyes, Take Warning: These even carry on to Yang when he takes over his body.
• Was Once a Man: He was once a human wizard.

The Manotaur

Voiced by: Seth MacFarlane

A half-man with hairy hooves, but all man (that is if one would count collecting comic books and action figures manly). He is a large man with a bald head who dresses like a city man.

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• Ambiguously Bi or Camp Straight: He's trying to win over Womanotaur and he has an interesting fashion sense.
• Bald of Evil: He's bald and his plan was to kidnap all the Twonicorns and to shave off all their hair to make a large wig to cover up his really smooth, bald head to get a date with the Womanotaur.
• Evil Lawyer Joke: Becomes one in "Game Over".
• Flat Character: Lampshaded, when he notes that a Pet the Dog moment is “Out of my lack of character”.
• Four-Fingered Hands: Unlike the rest of the cast, he subverts it. Most of the cast treat it as a horrifying thing that he has five fingers.
• Half-Human Hybrid: Half man, half minotaur.
• Large Ham
• Real Men Wear Pink: He's not ashamed of wearing a pink shirt or sweater.

Badfoot

World famous funk singer and the one enemy Yo could never defeat. This funkadelic horse man comes into town once a year to extract Woofoo out of Master Yo. And by “extract”, we mean beat it out of him.

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• Cane Fu: His weapon of choice is LickinStick, a magical pimp cane he charges with woofoo. And he charges it by whacking the nearest woofoo user.
• Expy: From the top of his slick hairdo to the tips of his hooves and the tip of his sparkling cape he’s James Brown. Even his name’s a reference to “Goodfoot”.
• Small Role, Big Impact: Not Badfoot himself actually but his weapon, LickinStick. The woofoo warriors start restocking the armory with it and this becomes the first item on Yang’s alleged “sacred quest” that would eventually resurrect Eradicus and bring about the Dark Tomorrow.
• Villain with Good Publicity: He’s not just a bad guy, he’s a famous funk singer with cheering fans and everything.
• Weaksauce Weakness: He can’t go anywhere without his horn section. And he can’t do anything without them either, including attack.

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