Shy Ninja's main enemy who resembles a demon of sorts and has cloud-based powers. Also one of Lord Boxman's investors for his company.
Hero Level: -6
- Arch-Enemy: She and Shy Ninja are archenemies.
- Bad "Bad Acting": In the "Boxmore Infomercial" short, she is obviously reading aloud her lines from a cue card, judging by the poor inflection and random pauses in her dialogue.
- Early-Bird Cameo: Vormulax first appeared in the short "Boxmore Infomercial", but first appeared in the show in "Know Your Mom".
- Fangs Are Evil: Has a mouth full of sharp teeth.
- Go-Karting with Bowser:
- She was one of the Plazalympics judges in "Plazalympics" among Mr. Gar and Carol.
- In "Dendy's Power" neither K.O. nor Dendy show any aversion to her presence when she wants her POW Card customized, strangely enough, yet K.O. is bothered by Shannon.
- Our Demons Are Different: Has a cloud motif. Described as a alien-esque ghoul.
A retired member of a gang of humanoid cacti called the "Kactus Krew" until Carol, under the name of Silver Spark, single-handily took down the gang.
Hero Level: Unknown
- Adam Westing: He's a parody of aging Nu Metal stars voiced by Jonathan Davis of Korn, the band that essentially invented the genre.
- Feeling Their Age: Because he's so old and hasn't fought in years, he's easily tired during his fight with Carol, who isn't having any trouble with him at all.
- Go-Karting with Bowser: He at first comes to a showdown with Carol, but he's too old and gets winded too easily. Carol invites him to a cup of coffee and they reminisce about old times.
- Green Thumb: He has the power to grow cacti from the ground.
- Magic Staff: He uses his staff to fight and to summon cacti from under the ground.
- Plant Person: Of the cactus variety.
- Retired Monster: He's a former member to a group of villainous cactus people. However "Villains' Night Out" shows that he may not be entirely retired as he attends Billiam Milliam's party.
- Rotten Rock & Roll: A villain with a(n aging) rock star theme. His gang was also a popular rock band, as a Kactus Krew song plays on the radio.
- Waxing Lyrical: Most of Succulentus' lines are from lyrics to songs by various early 2000's Nu Metal acts like Korn, Linkin Park, System of a Down and Evanescence. This video lists all of the lyrics he references.
One of Lord Boxman's investors for his company.
Hero Level: Unknown
- Casual Interstellar Travel: She uses her powers to travel across galaxies in her leisure time.
- Corrupt Corporate Executive: She's an investor in a company that sells robotic minions to villains. That aside, her business practices seem fairly straight.
- Elemental Hair Colors: Has red hair and a flame breath ability.
- Evil Redhead: She's a successful villain with long red hair.
- Extreme Omnivore: A self-described "foodie" who enjoys all kinds of culinary delights from space cuisine to entire planets.
- Fangs Are Evil: Has a mouth full of sharp teeth.
- Femme Fatale: Has the appearance and personality.
- Glowing Eyes of Doom: When she uses her powers, her eyes glow purple.
- Greater-Scope Villain: She's in charge of Boxmore's funding, which makes even Boxman subservient to her. She's also the one who deposes Boxman, and makes Darrell a Dragon Ascendant.
- Lizard Folk: She's a reptile woman.
- Meaningful Name: Cosma is a fitting name for a reptilian villain who likes traveling the cosmos.
- Mind over Matter: She can use telekinesis. But unlike Rad or Dr. Greyman, she doesn't need to use her hands to levitate objects.
- Non-Mammalian Hair: Has medium-length tawny hair, despite being a Lizard Folk.
- Non-Mammal Mammaries: Despite being a Lizard Folk, she clearly has breasts.
- Planet Eater: Her appetite can grow enough that she will literally eat an entire planet, as she did with Planet X. Judging by how casual she relays this information, it's clearly not the first time she's done so.
- Playing with Fire: Can breathe fire.
- Pragmatic Villainy: She wishes that Boxman was more focused on his company since she's investing in his business and attacking the plaza has no benefits for her or the other investors, not that they care about what happens to it.
- Purple Is Powerful: Her teleportation abilities make the objects of focus warp in a purple color.
- Sizeshifter: Can become a Giant Woman or turn into an Incredible Shrinking Woman. Although it's implied that she gets larger the more she eats as she shrunk after coughing up Planet X.
- Swiss-Army Superpower: She claimed that her Sizeshifter ability is one perk of her "molecular malleability" power, which might be the source for all of her powers.
- Villain of Another Story: Like Venomous, her apparent villainy is unseen because she's not an enemy of the plaza. In fact, she wishes Boxman would stop bothering with it. Subverted as of "Deep Space Vacation", where we get to see her villainy in action.
- Villainous Glutton: Describes herself as a foodie, she travels across the universe sampling intergalactic cuisines. Up to and including entire planets.
- Villain Teleportation: She can teleport objects. It's demonstrated when she uses it to teleport a basket of muffins- the muffins into Boxman's mouth and the basket onto his head- to shut him up.
- Weaksauce Weakness: Incompetence and dealing with Boxman, which is painful to her.
- Yellow Eyes of Sneakiness: Her yellow eyes are emphasized when she's in the shadows or when the screen goes black.
- You Have Failed Me: After finding out that Boxman Jr. destroyed much of Boxmore she has Boxman fired... out of a cannon, into the sun.
Billiam Milliam is a rich, sophisticated villain who's also one of Lord Boxman's investors.
Hero Level: -7
- Amazing Technicolor Population: Has shiny golden skin.
- Butt-Monkey: Professor Venomous and Fink love to bully and mock him. They apparently make a habit out of sinking his boats and to watch him cry.
- Chrome Champion: His whole body appears to be made out of some kind of golden metal.
- Ink-Suit Actor: A bit. Billiam's face is basically a translation of Justin McElroy's own.
- Punny Name: His name sounds like "Billion Million".
- Uncertain Doom: In the final episode, which is also the series's epilogue, Billiam is shown to have bought the Moon and living there with all of his minions. Then Cosma, in her gigantic form, comes by and eats the Moon in a single bite with Billiam and his men still on it, before shrinking back to her usual size and casually flying off. Since she and Billiam were associates, it's unknown whether she was aware he was on the moon, knew but didn't care, or even if it was fatal to Billiam for that matter. Still, he's not seen again after that.
- Upper-Class Twit: He's rich to the point of absurdity, and he's an enormous tool.
- Villain of Another Story: He's another villain whose villainy is unseen due to not being an enemy of the plaza.
- Wealth's in a Name: His name sounds like "Billion Million" and with a name like that, he's unsurprisingly quite wealthy.
The minions and bodyguards of Billiam Milliam.
Hero Level: Unknown
- Bald of Evil: The bodyguards are all bald.
- Blush Sticker: The minions have blush stickers on their cheeks.
- Chrome Champion: While Billiam has golden metal skin, they have grey or silver metal skin.
- Evil Minions: They serve as Billiam's minions.
- The Speechless: None of them speak throughout the whole series.
A villain that Hero is on a quest to defeat.
Hero Level: -99
- Big Bad: He's the main villain of in RPG World and Hero is on a quest to defeat him.
- Invincible Villain: He is a level -99 boss, in a world where being considered level -10 makes you a big threat, this gets to the point that not even the Hero is a match for him. He is only "defeated" when he realizes that he no longer remembers what his reason for being bad was.
- Motive Decay: After K.O. leaves him and Hero alone, the two realized that they forgot why they are fighting. His case is more justified, since he is trapped in his tower and doesn't have any other thing to do but wait for Hero to come and Level Grind.
- Orcus on His Throne: He's waited in his tower as Hero spent a long time Level Grinding. Since he's a Boss Battle in-universe, he can't leave, or do anything but his own Level Grinding.
- Sealed Evil in a Can: He can't leave his tower or even move from the spot he's scripted as standing on for his Boss Battle. Once he and Hero realize they've forgotten what they were fighting over, Hero is free to live his life elsewhere, while Galgarion is stuck in place, and no threat to anyone in the meantime.
- The Unpronounceable: Hero can never manage to say his name right.
- Villain Forgot to Level Grind: Averted. He did some Level Grinding while waiting for Hero to show up because he had nothing better to do. One has to wonder how though, since he's rooted in place.Galgarion: I can't actually move from this spot.
- World's Best Warrior: Being level -99, he is one of the best warriors in the world, being able to defeat the Hero with ease.
Dr. Barbara "Babs" Blight is an eco-terrorist scientist from Captain Planet and the Planeteers who helps Lord Boxman pollute the plaza.
Hero Level: Unknown
- Character Overlap: She, along with Kwame and Captain Planet, are from Captain Planet and the Planeteers.
- Fangs Are Evil: One key difference between Dr. Blight's design in this show and her original design is that she sports a pair of sharp fangs.
- Missing Steps Plan: She convinced Lord Boxman that it is scientifically proven that he will get more money if he pollutes more, but she never explained to him why. Of course, this is because she only wants to pollute to destroy the world and most likely doesn't care about Boxman's business.
- Ms. Fanservice: Dr. Blight was always a looker, but this series pumps up her curves and gives her a much more sensual voice.
- Non-Standard Character Design: Her bodysuit employs more traditional shading, similar to her home series.
- Stupid Evil: When she mentions how the pollution she and Boxman will emit would wipe out all life on Earth, Boxman interjects, saying that it would wipe them out too. She doesn't seem to care in the slightest, and Boxman goes along because he thinks it'll give him a shot at wooing her.
- The Vamp: She uses her looks to her advantage when negotiating with Boxman, who's practically putty in her hands.
Hero Level: Unknown
- The Ghost: We don't see him, just a robot he sicced on P.O.I.N.T. headquarters.
- Meaningful Name: Where to hit and defeat this mad doctor's creations is rather obvious.
A cyborg bull villain.
Hero Level: -5
- Brain in a Jar: His brain is on display on his head.
- Butt-Monkey: Boxman treated him like this in "Villains' Night Out", by taking away his complementary T-shirt, interrupting his karaoke song, and taking his turn to blow something up.
- Cyborg: He's part bull, part robot.
- Horns of Villainy: He has three horns sticking out of his head.
- Noodle Incident: He ends up attacking the Plaza in Boxman's absence during the summer for some reason.
- Our Minotaurs Are Different: He resembles a minotaur.
- This Is a Drill: He has a drill as his right hand.
Four plant-humanoid villains introduced in "Villains Night Out" that attended Billiam Milliam's party. Cantalop has a broad-shouldered, round build, Hon has a more human-like build, Wat is more of a hunchback, and Nappa has a short human-like build.
- A Day in the Limelight: A glorb-enhanced Cantalop is fought by Mr. Gar and K.O. in “GarQuest”.
- The Igor: Wat Mel, due to his hunchback.
- Plant People: Of the melon and cabbage variety.
- Punny Name: Their names tell you they're cantaloupe, honeydew, lettuce, watermelon, and napa cabbage people.
- Shout-Out: They're named after a quartet of NPCs from Princess Tomato in the Salad Kingdom.
A multiversal villain that singlehandedly destroyed CN City, and is summoning various heroes from across the Cartoon Network Multiverse so he could hunt them down.
- Back for the Finale: He makes a cameo in the series finale, attempting to attack CN City again.
- Bad People Abuse Animals: Has hunted down Courage, Grizz, Weasel, and Monkey, among others.
- Big Bad: He's the main villain of "Crossover Nexus".
- Did You Just Punch Out Cthulhu?: He's even managed to X out characters as powerful as Grim and Black Hatnote .
- Evil Versus Evil: While he is a Hero Hunter, he's willing to go after Villain Protagonists like Black Hat.
- Generic Doomsday Villain: Played for Laughs as Raven comically discards any notion of him having a motive, concluding that hero hunting is "just his thing".
- Hero Killer: Countless heroes of Cartoon Network have fallen to him.
- Mysterious Past: Not much is known about him, and when someone asked Ian Jones-Quartey about his past, his response was "that's classified!".
- Taken for Granite: Those he has defeated are turned into statues with a red "X" on them.
- Would Hit a Girl: Is hunting down Garnet and Raven, and has defeated, among others, Numbuh Five, Yumi, Frankie Foster, Ilana, and Juniper Lee.
- Would Hurt a Child: Many of the heroes he's hunted down and petrified are children, most of whom (like Chowder, Kelsey, Greg, and Double D) have little or no fighting ability.