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.
Big Bad: Subverted as A. he only thinks he's bad, and B. he's not that big.
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
Evil Is Petty: Though pettiness is all that really makes him evil.
Expressive Mask: "Voltar Squared" revealed that his face is actually a helmet. Thus, its probably one of the most expressive masks ever created.
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.
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.