Villains that have appeared more than once in both series. Often facing the monks on their own terms or teaming up with the bigger villains in the series.
A seeming endless legion of robots built by Jack Spicer, whom serve as his minions throughout the series. While typically shown with one uniform design, Jack-Bots can be redesigned for specific needs or circumstances. They are usually the ones who bear the brunt of the monks or other character's attacks.
- Artificial Stupidity: At times, they're not exactly the brightest light bulb in the room. For example, in "Like a Rock!" two Jack-Bots ran into each other and then proceeded to tear each other into pieces, for no good reason.
- Animal Mecha: Dog-Bots, Koi-Bots, and Dolphin-Bots are just a couple of animals that have been mechanized.
- Benevolent A.I.: Dude-Bot from "The Deep Freeze", whom cared more about making friends than fighting. Too bad no else could share the sentiments.
- Deceptively Human Robots: The Chameleon-Bot that disguised itself as Kimiko in "Chameleon". In addition to having visible bolts in the neck, the bot would visibly glitch and would say error messages aloud.
- Depending on the Writer: Their competence and functionality depends on what the current episode's plot demands. "Citadel of Doom" shows them gunning down one of Wuya's rock golems without a hitch, while in another episode their marksmanship is about as great as an Imperial Stormtrooper.
- Do-Anything Robot: Whatever Jack Spicer needs they'll do it. Tearing up a forest? Yep. Illegal deep-diving? Totally. Providing refreshments? Absolutely.
- Easily Detachable Robot Parts: When they're not being smashed to bits, their limbs and parts can be detached like legos.
- Just a Machine: How most of the characters treat them. Jack on the other hand treats them with more respect and care.
- Killer Robot: One of their primary designs is being this. They managed to fulfill this duty in "Time After Time".
- Machine Monotone: Whenever a Jack-Bot speaks, their tone is dry and emotionless, with a little buzz too.
- Mecha-Mooks: Their main purpose, especially in the second series.
- Robot Me: The Chameleon-Bot as Kimiko in "Chameleon" and then Robo-Jack Spicer from "The Shard of Lightning".
- The Usual Adversaries: The Monks deal with them quite regularly, usually by detroying the bots by dozens.
A girl who met Jack Spicer at one of his parents' parties. After Jack failed in acquiring the Golden Tiger Claws, she joined him and Wuya on the Heylin side. She shows her affinity for cats by dressing up in a costume that consists of a form-fitting catsuit with heeled boots, a head cover, and cat ears.
- Blonde, Brunette, Redhead: Of the three recurring female characters in the series, Katnappe is the blonde to Kimiko's brunette and Wuya's redhead.
- Cat Girl: Takes the appearance of a cat, with black whiskers-like marks, fangs which appear to be real, gloves with sharp claws, a tail which can twitch and a hat with cat ears. Sometimes she takes the cat theme a bit too far, eating a living fish at one point.
- Chronic Backstabbing Disorder: In her debut episode she takes the Golden Tiger Claws for herself rather then give them to Jack and Wuya. In a later episode, she likewise abandons Wuya when the mission became too annoying for her. Needless to say, she doesn't work well with others.
- Curb-Stomp Battle: She defeats Omi in a showdown within seconds in her debut.
- Dark Action Girl: Easily defeats the monks twice in her debut appearance, partially due to Clay refusing to fight a girl, even if she's an evil one.
- Designated Girl Fight: Bad puns aside, Katnappe typically faces off against Kimiko.
- Do Not Call Me "Paul": She hates being called by her actual name, which is "Ashley."
- Expy: She's basically teen version of Catwoman from Batman, but more villainous.
- Extreme Omnivore: She shows how far she takes the cat theme in "The Shard of Lightning" by snacking on a live goldfish.
- Incredibly Lame Pun: Often makes painful cat-based puns when out villaining. It's lampshaded in the episode Royal Rumble.Katnappe: My my my, look what the cat dragged in.Kimiko: Ugh, I hate your cat puns.Katnappe: Really, I find them puuuuurfect.
- It's All About Me: Unlike most of the other villains, she has little to no interest in world domination. Only in the villain business for her own pleasure, she could care less about the fight between good and evil.
- Pungeon Master: More cat puns than you can twitch a whisker at.
- Spy Catsuit: Wears a skin-tight black catsuit (no pun intended).
- The Trickster: Sometimes causes trouble just for fun, like stealing a child's ice-cream, then throwing it on the ground and going into a rollercoaster without waiting her turn.
- The Vamp: Manages to seduce Omi in "The Apprentice" after she gets injured and fools him into allying with the monks to help them take back the Shen Gong Wu stolen by Jack.
An extremely overweight, but surprisingly agile ninja that is promised by Wuya and Jack Spicer that if he retrieves a Shen Gong Wu called the Sword of the Storm then he will be able to join the Heylin.
- Acrofatic: Despite his enormous size, he's just as quick and agile as you'd expect from a ninja.
- Belly Flop Crushing: A move he uses.
- Bilingual Bonus: With a dash of Punny Name.
- Evil Laugh: Complete with fart.
- Fat Bastard: He's overweight and villainous.
- Highly Visible Ninja: Not only does his size make it difficult for him to hide, but his black ninja shirt leaves his very pale stomach exposed making him easy to spot.
An extremely muscular vendor from Russia who infiltrates the Xiaolin Temple.
- Adapted Out: In the original series, he's part of Jack's crew along with Katnappé, Tubbimura and Cyclops. In Chronicles, he's never seen with the rest of the crew, having been replaced by Tubbimura's chihuahua, Muffinface.
- Combat Pragmatist: When Kimiko attempts to use the Two-Ton Tunic against him, he simply lifts her out of it and takes the Wu for himself.
- Dumb Muscle: He has some moments of stupidity, such as when he foils one of Jack's best plans he ever came up with by revealing it to the monks, which snaps Omi out of his Heroic BSoD.
- Evil Gloating:
- Can't resist the urge in his debut episode, which even Jack Spicer thinks it's a very bad idea, as it costs them their victory.
- It was more or less a bad idea as Vlad's gloating revealed their entire scheme to make Omi think he'd be evil in the future and gave the monk his Heroic Second Wind.
- Fat Bastard: A clear sign that despite appearing to be a good guy at first, he's actually on the Heylin side and works for Jack Spicer.
- Husky Russkie: Out all of the presumably young characters in the series, he is the biggest, dwarfing even Clay in size. He comes from Russia.
- The Mole: Pretends to join the monks in his debut appearance after he pretends to defeat Jack Spicer, but he's actually working for the latter and helping him with the plan of convincing Omi he's destined to turn into the biggest evil ever. Dojo is the one to discover this after he notices the Reversing Mirror (which back then belonged to Jack) in his sack.
- Phenotype Stereotype: He's a Russian with blue eyes and blond hair.
A ruthless Hong Kong kingpin.
- Advertised Extra: For someone who is shown among villains like Jack and Chase Young in the opening, he only has two major appearances in the series under his belt.
- Animal Motifs: The panda. PandaBubba wears a black and white suit, two tufts of hair growing on his head that look like ears, and has several markings on his face that gives him the look of a large panda bear.
- Corrupt Corporate Executive: In his second appearance.
- Cut Lex Luthor a Check: Unlike other villains, who have grandiose schemes for world domination, PandaBubba uses Shen Gong Wu for relatively mundane, but illegal, money-making ventures, like arming his thugs with Wu to commit crimes or mind-controlling people into a workforce of slave labor.
Mala Mala Jong
An ancient evil demonic warrior made up of the Helmet of Jong, the Heart of Jong, the Two-Ton Tunic, Jetbootsu, Fist of Tebigong, Third-Arm Sash, Shroud of Shadows, Eye of Dashi, Logi Kite, and possibly any other Shen Gong Wu it can acquire.
- Achilles' Heel: If confronted directly, he's invulnerable to all kinds of attacks, but since The Heart of Jong is what makes him alive, the only way to defeat him is by removing it.
- All Your Powers Combined: Has each power of the Shen Gong Wu that makes up its form. In its initial appearance, this is limited to...
- Flight: The Jet Bootsu make up his feet and give him the ability to fly.
- Invisibility: He doesn't use this ability often, but The Shroud of Shadows, which is attached to his back, allows him to become invisible.
- Nigh Invulnerable: The Two-Ton Tunic makes up his body and it makes him invulnerable to the monks' attacks.
- Shock and Awe: The Eye of Dashi is worn around his neck like a pendant and it allows him to shoot electricity.
- Curb-Stomp Battle: Easily steamrolls most people it fights in it's first appearance. Subverted in the second in that while the monks still have difficulty with him and the other jongs, they aren't nearly as outmatched as they were the first time.
- The Dreaded: Feared by everyone except Wuya.
- Four Is Death: The amount of Jongs it splits into, called the Fearsome Four.
- The Juggernaut: In his first appearance alone he defeats every last experienced monk at the Xiaolin temple, Master Fung included, then easily beats Raimundo and takes the Sword of the Storm from him, and once he's led by Wuya to where the monks-in-training are, he easily takes the attacks from every Wu they use against him and eats the orb of tornami. The monks only beat him because Omi was able to rip the heart of jong out with the golden tiger claws, and had he been noticed, they would have been dead.
- Knight of Cerebus: It was the first major antagonist that the Monks couldn't conventionally defeat, and had to retrieve a Shen Gong Wu they got rid of just for a chance to destroy it. The fact it doesn't talk means it also doesn't exchange witty banter with the Monks.
- Me's a Crowd: In its second appearance, it gains enough Shen Gong Wu that with the Ring of Nine Dragons, it splits into more Jongs.
An enormous, fat, red, and dim-witted giant monster. He has no depth perception, and his only good points are his immense strength and dark power eye beams.
- Cyclops: His name comes from the fact that he's a giant monster with a single eye.
- Dumb Muscle: He's physically strong but has the intelligence and emotional maturity of a toddler. He cannot speak, is easily enraged/upset, and is implied to be incontinent.
- Eye Beams: Other than his supernatural strength, his other method of attack is to fire a laser beam from his one eye.
- The Juggernaut: In his first apperance. He easily defeats the monks up until the final showdown of the episode. In later apperances while he's still rather powerful, he's also far less impossible to defeat.
- Psychopathic Man Child: Even if he's very immature and Jack Spicer has to take care of him like a baby, he's still an emotionally unstable monster you wouldn't want to mess with.