The leader of the titular League, a short red man, always seen wearing a helmet. He is very determined, yet most of the times his persistant plots for domination are foiled either due to poor planning, bad luck, short-sightedness/pettiness or the ineptness of his minions. But most of the time, its all of the above.

* AmbiguouslyHuman: Even without his helmet or suit, he's shown to have extremely pale skin and entirely black eyes with glowing yellow pupils. [[EpilepticTrees He could be an alien invader of some kind, which would explain a few things.]]
* BigBad: Subverted as A. he only ''thinks'' he's bad, and B. he's not that big.
* BigBadWannabe: 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
* EvilIsPetty: Though pettiness is all that really makes him evil.
* ExpressiveMask: "Voltar Squared" revealed that his face is actually a helmet. Thus, its probably one of the most expressive masks ever created.
* {{Expy}}: You could say that he's [[WesternAnimation/InvaderZim Zim]] in a supervillain get up.
* GlowingEyesOfDoom: Perhaps the reason he is the leader of the League.
* {{Jerkass}}
* LargeHam: Sure, his plans usually do little more than annoy the neighbours, but he's so ''enthusiastic'' about how '''evil''' they are.
* TheNapoleon: He's no bigger than the neighbourhood kids, but acts like the greatest villain of all time.
* PointyHairedBoss: 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.
* PokeThePoodle: What most of his acts of 'villainy' involve, such as selling shampoo that would make everyone's hair sticky.
* RedOniBlueOni: The red to Frogg's blue.
* SmallNameBigEgo: He's mostly ignored as a villain, but convinced he's a global threat.
* SuperZeroes: A villainous example. Most superheroes don't even bother to fight him and the League, since they're such {{Harmless Villain}}s.
* TooDumbToLive
* [[spoiler: TragicVillain: The WholeEpisodeFlashback 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.]]

!!Doktor Frogg
* AffablyEvil: Not nearly as much as Red Menace, but he's still fairly polite for an AxCrazy psychopath bent on world domination.
* ButtMonkey: Most of the abuse and physical humour tends to happen to him.
* ChildhoodFriends: In "Once Upon a Lose" [[spoiler: 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]]
* TheChewToy: Often literally, as Doomageddon loves chewing on his mechanical hands.
* DeadpanSnarker: Being a supergenius, is often annoyed by Voltar's idiocy and lack of ambition beyond annoyance.
* TheDragon: Seems to be the second-in-command, and often called upon to design the devices to enact Voltar's schemes.
* DependingOnTheWriter: He sometimes play his part in Voltar's petty little schemes cheerfully and without complain
* EvilGenius: The only guy on the team that actually deserves this title.
* FacePalm: Or rather Face-Claw,, and often when Voltar does or suggests something really stupid.
* GoodHurtsEvil: Is shown to hate good things like rainbows and happiness. He considered the SugarBowl dimension that Doomageddon teleports to a hellish torture.
* LikesOlderWomen: He has a crush on The Cougar.
* OnlySaneMan: 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.
* MadScientist
* MorallyAmbiguousDoctorate
* NoCelebritiesWereHarmed: His voice is an imitation of Creator/PeterLorre.
* NoodlePeople
* NotSoAboveItAll
* RedOniBlueOni: The blue to Voltar's red.
* SuddenlyShouting: "Oh, I suppose I ''could'' if you hadn't SPENT ALL OUR MONEY ON FOAM DINOSAURS!!!"
* TokenEvilTeammate: He's the only member of the League who is actually evil as opposed to just annoying.
* WhyDidItHaveToBeSnakes: He's allergic to hair so much to be terrified of it

!!Red Menace
* AffablyEvil: {{Exaggerated}} to ridiculous levels, to the point that he has no evil or even jerkish qualities whatsoever but still calls himself evil.
* BewareTheNiceOnes: When he gets really angry, he can be ''really'' dangerous
* TheBrute: InNameOnly.
* ChildhoodFriends: In "Once Upon a Lose" [[spoiler: 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]]
* DumbMuscle: 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.
* EvilRedhead: Though, not so much evil.
* GentleGiant: Helps little old ladies cross the street.
* MinionWithAnFInEvil: Likes baking cupcakes, and suggests reasonable ("good") solutions to problems. The only reason he became a supervillain was because [[spoiler: he was disgusted at how [[GoodIsNotNice corrupt]] and [[SuperDickery obnoxious]] the superheroes at his school were.]]
* TokenGoodTeammate: He's a generally nice guy, really.

* BigEater
* ExtremeOmnivore
* NamesToRunAwayFromReallyFast
* SugarBowl: Where he teleports to, according to Doktor Frogg.
* TeamPet

!!Lightning Liz
* DaddysLittleVillain: Subverted. She's BigGood Action Guy's daughter and a complete and utter brat.
* PoweredArmor: Nagged her dad into letting her use it.
* RichBitch
* SassyBlackWoman
* SitcomArchNemesis: To the League.
* SpoiledBrat

!!Justice Gene
* FaceHeelTurn: Briefly became ''In''justice Gene, which went about as well as his other career choices.
* KnightTemplar
* ObstructiveBureaucrat
* SeriousBusiness: He took his neighborhood watch job VERY seriously.
* SitcomArchNemesis: To the League.
* SuperZeroes: 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.
* WellIntentionedExtremist

!!Action Guy
* AFatherToHisMen
* BadassNormal: He's a GIJoe style hero who manages to fight regular super villains on a daily basis.
* BigGood

* BigBad: Despite Voltar's boasts, Skullossus is this to the world at large.
* FrickinLaserBeams
* MechaMooks: His Skullmandos ''might'' be this.
* MobileSuitHuman: He's actually just a skull atop a massive robotic body.