Really 700 Years Old/Vague Age: He has his own house and is old enough to get married, so he's likely a fully grown devil, possibly at least over a hundred years old (since Lucius is around seven-hundred). Still, he acts like lazy teenager or college fratboy, and seems to still be under Lucius's care.
Rock Me, Asmodeus!: He's apparently quite good at playing rock guitar, as seen in Heloise's Secret Admirer.
A very intelligent 11-year-old young girl and Jimmy's other best friend. She works for Misery Inc. as top inventor in making hazardous products for people in bringing misery. She is sadistic and likes to torment anyone she hates which is pretty much almost everyone. She has a big crush on Jimmy. Voiced by Tabitha St. Germain.
Through His Stomach: Heloise attempts this on a semi-regular basis to win Jimmy's affections, including snacks "whipped up from scratch" and two very complete picnics (Beezy and Cerbee ruined the first).
What Could Have Been: Supposedly in the show's original, more adult concept, Miseryville was actually Hell where Jimmy was accidentally sent. Heloise was meant to be a serial killer who was stopped by police via a headshot (hence the scar), and was in charge of being Jimmy's torturer but took a liking to him instead. While these darker elements were re-worked into more just implications than ever stated outright, perhaps it explains a lot about her personalty.
The seventh ruler of Miseryville and in charge of Misery Inc. He is a short, red devil-like creature who is the father of Beezy J. Heinous and is very much unlike his son. He hates Jimmy due to his happy attitude being a foil to his plans. He is dating Jez. Voiced by Sean Cullen.
Not-So-Harmless Villain: Word of God has said Lucius actually has some terrible and threatening powers, to the point where he could change the planet to his will, but keeps them in check to prove he doesn't need to use them in order to rule.
Lucius's girlfriend who is tall, blue and can change her noses. She is often very picky in her dates with him and threatens to break up with him. She lives in a white mansion and owns a pet dog named Jazmeen who Cerbee, Jimmy's pet, once fell in love with. Voiced by Valerie Buhagliar.
Beezy's girlfriend who is an orange-skinned, one-eyed creature. She hates statues and destroys any she sees. She usually spouts one-word phrases such as "Yogurt!" and "Smoothy-Smooth!" but occasionally speaks sentences. Voiced by Sunday Muse.
Head of Lucius' muscle, Molotov is large and in charge...whenever he isn't being bossed around by his wife. He also has a son named Tory, and a baby daughter named Blamo. Speaks in a vaguely Russian accent. Voiced by Dwayne Hill.
Names to Run Away From Really Fast: He's likely named after Vyacheslav Molotov, Stalin's protege in Communist Russia. Or it could be refrencing the weapon named after him, the Molotov cocktail, an improvisational bomb made with a rag and a bottle of petrol fuel.
The sixth ruler of Miseryville, Lucius VII's father and Beezy's grandfather. He's even crueler and more evil than his son. He is rather old and is in a wheelchair, with his limbs occasionally falling off. Lucius overthrew and cryogenically froze him many years ago, but he's defrosted every now and then for various reasons. Voiced by Sean Cullen.
A tiny, one-eyed demon who's Heloise's lab assistant. He often has invention ideas of his own, but they're not very good. Heloise has numerous clones of him in case he's ever injured or killed, which is often. Voiced by Dwayne Hill.
A father/son team of con artists who live to swindle the people of Miseryville out of their money. Rudolpho will sell you just about anything, but expect it to have some kids of flaw, while Peep will merely pick your pockets. Rudolpho is voiced by Juan Chiron, and Peep by Christian Potenza.
Affably Evil: Peep, despite being a conning salesman, comes off quite pleasant and doesn't bare any ill will to the good guys.