The League of Super Evil
- Voiced by: Scott McNeil
- Ambiguously Human: Even without his helmet or suit, he's shown to have extremely pale skin and entirely black eyes with glowing yellow pupils. He could be an alien invader of some kind, which would explain a few things.
- Big Bad Wannabe: Believes himself to be a great villain, though his schemes rarely do more than annoy the neighbours. And that's when they work. Always upstaged by every other villain, especially Skullossus.
- Book Dumb: Where to begin? First off he is so stupid he thinks the woolly mammoth invented the printing press.
- Cloud Cuckoo Lander: Voltar is normally detached from reality, to say the least.
- Evil Is Petty: Though pettiness is all that really makes him evil. In fact, most of the time he is completely driven by his pettiness even when world domination is given to him on a silver platter. Such as when he actually manages to steal Skullossus' spaceship and has the capability to destroy entire armies and he thinks the absolute most evil deed possible is using it to pester his neighbor Steve.
- Expressive Mask: "Voltar Squared" revealed that his face is actually a helmet. Thus, it is probably one of the most expressive masks ever created.
- Expy: You could say that he's Zim in a supervillain get up.
- The Faceless: We never see his face.
- Funsize: He is often mistaken for a child due to his size, with one episode having him mistakenly be put into Super Daycare.
- Glowing Eyes of Doom: Perhaps the reason he is the leader of the League.
- Large Ham: Sure, his plans usually do little more than annoy the neighbours, but he's so enthusiastic about how evil they are.
- The Napoleon: He's no bigger than the neighbourhood kids, but acts like the greatest villain of all time.
- Not-So-Harmless Villain: In-Universe example, Season 2 onwards reveal that his petty little schemes are indeed viewed as the great offenses he claims they are, the problem is their small scale they are commited in.
- Pointy-Haired Boss: For being the leader of a supervillain team, his schemes never seem to accomplish much. He also tends to disregard suggestions by Dr. Frogg, who is quite capable.
- Poke the Poodle: What most of his acts of 'villainy' involve, such as selling shampoo that would make everyone's hair sticky.
- Red Oni, Blue Oni: The red to Frogg's blue.
- Small Name, Big Ego: He's mostly ignored as a villain, but convinced he's a global threat.
- Skewed Priorities: Many times he could have accomplished something extremely villainous but he's more concerned with doing something petty to notice.
- Super Zeroes: A villainous example. Most superheroes don't even bother to fight him and the League, since they're such Harmless Villains.
- Tragic Villain: The Whole Episode Flashback reveals he was at one point the Hall Monitor of Metrotown's Hero School, and would have been the next big hero if Glory Guy hadn't bribed his way up.
- Underwear of Power: He wears a pair of red trunks with a skull-buckle on the outside of his costume.
- Villain Protagonist: A Big Bad Wannabe but also the main character.
- Voiced by: Lee Tockar
- Affably Evil: Not nearly as much as Red Menace, but he's still fairly polite for an Ax-Crazy psychopath bent on world domination.
- Butt-Monkey: Most of the abuse and physical humour tends to happen to him.
- Childhood Friends: In "Once Upon a Lose" it is revealed that Red Menace and Doktor Frogg have been best friends since school and have known and followed Voltar for just as long.
- The Chew Toy: Often literally, as Doomageddon loves chewing on his mechanical hands.
- Deadpan Snarker: Being a supergenius, he is often annoyed by Voltar's idiocy and lack of ambition beyond annoyance.
- The Dragon: Seems to be the second-in-command, and often called upon to design the devices to enact Voltar's schemes.
- Depending on the Writer: He sometimes plays his part in Voltar's petty little schemes cheerfully and without complaint.
- Evil Genius: The only guy on the team that actually deserves this title.
- Face Palm: Or rather Face-Claw,, and often when Voltar does or suggests something really stupid.
- Good Hurts Evil: Is shown to hate good things like rainbows and happiness. He considered the Sugar Bowl dimension that Doomageddon teleports to a hellish torture.
- Insufferable Genius: He is genuinely smart and able to come up with complex inventions, but usually gets brushed aside by Voltar.
- Likes Older Women: He has a crush on The Cougar.
- Only Sane Man: If one of Voltar's plans are stupid, nonthreatening, and childish even more than usual (and that's saying something!) Frogg will point it out.
- Mad Scientist: You know there's something wrong with the villains when their Mad Scientist is the Only Sane Man.
- Morally Ambiguous Doctorate: He does appear to have a genuine doctorate, but of course uses it to perform mad science.
- No Celebrities Were Harmed: His voice is an imitation of Peter Lorre.
- Noodle People
- Not So Above It All
- Power Pincers: While he was in school during his first encounters with the rest of the league, he had his right hand crushed by Red Menace and his left hand bitten by Doomageddon. Being the mad scientist he is, he invented custom pincer hands of the "cybernetic" category to compensate for his misfortune.
- Red Oni, Blue Oni: The blue to Voltar's red.
- The Smart Guy: The League's Resident Evil Genius and Mad Scientist.
- Suddenly SHOUTING!: "Oh, I suppose I could if you hadn't SPENT ALL OUR MONEY ON FOAM DINOSAURS!!!"
- Token Evil Teammate: He's the only member of the League who is actually evil as opposed to just annoying. Even then, its mostly just by comparison.
- Why Did It Have to Be Snakes?: He's allergic to hair so much to be terrified of it.
- Voiced by: Colin Murdock
- Affably Evil: Exaggerated to ridiculous levels, to the point that he has no evil or even jerkish qualities whatsoever but still calls himself evil.
- Beware the Nice Ones: When he gets really angry, he can be really dangerous
- The Brute: In Name Only. He's really more of a Gentle Giant.
- Childhood Friends: In "Once Upon a Lose" it is revealed that Red Menace and Doktor Frogg have been best friends since school and have known and followed Voltar for just as long
- Dumb Muscle: Usually somewhat childish, and sometimes fails to get things for a joke. Just as often, though, he's shown as bright and resourceful. One episode showed Red scoring higher on a computerized intelligence test than Voltar.
- Evil Redhead: Though, not so much evil.
- Gentle Giant: Helps little old ladies cross the street.
- Minion with an F in Evil: Likes baking cupcakes, and suggests reasonable ("good") solutions to problems. The only reason he became a supervillain was because he was disgusted at how corrupt and obnoxious the superheroes at his school were.
- Not-So-Harmless Villain: He's generally a kindhearted Gentle Giant, except when his mind snaps at which point all his brawn combined with his unstable mind turns him into a rampaging juggernaut who cannot smash his way through walls and reinforced doors.
- Token Good Teammate: He's a geniunely nice guy, really.
The League's pet, a reptilian-canine creature called a Pan-Dimensional Doomhound (Hellhound in "Table for Four"). He possesses the ability to teleport between realities in a flash of flame. He also has a pretty big appetite, which often causes trouble for the League, especially Doktor Frogg, who can never seem to get on his good side.
- Big Eater
- Extreme Omnivore
- Hidden Depths: One episode reveals that when the League is away, he is actually a secret agent who helps keep order to villains and prevent nasty heroes from overthrowing them.
- Names to Run Away from Really Fast
- Sugar Bowl: Where he teleports to, according to Doktor Frogg.
- Team Pet
- Daddy's Little Villain: Subverted. She's Big Good General Sergeant's daughter and a complete and utter brat.
- Powered Armor: Nagged her dad into letting her use it.
- Rich Bitch
- Sassy Black Woman
- Sitcom Arch-Nemesis: To the League.
- Spoiled Brat
- FaceHeel Turn: Briefly became Injustice Gene, which went about as well as his other career choices.
- Knight Templar
- Obstructive Bureaucrat
- Serious Business: He took his neighborhood watch job VERY seriously.
- Sitcom Arch-Nemesis: To the League.
- Super Zeroes: The reason he takes such an interest in the League is that they're the only villain someone as incompetent as him stands a chance against.
- Well-Intentioned Extremist
- A Father to His Men
- Badass Normal: He's a G.I. Joe style hero who manages to fight regular super villains on a daily basis.
- Big Good
- Big Bad: Despite Voltar's boasts, Skullossus is this to the world at large.
- Mecha-Mooks: His Skullmandos might be this.
- Mobile-Suit Human: He's actually just a skull atop a massive robotic body.