- Flabber (Billy Forester): As described above, Flabber is a phantasm (phasm) who was trapped inside a pipe organ, and was freed by the kids. Out of gratitude he granted their wish to become their comic book heroes, the Big Bad Beetleborgs. This event also unintentionally released the Magnavores. Flabber was released by playing 3 notes on the organ. (He later revealed that playing those same 3 notes, then playing them in reverse would re-entrap him inside the organ). He acts as an advisor and best friend, and offers needed magic to the kids when fighting the Magnavores, and later the Crustaceans, though his magic does not always work the way he may hope for it to work. He is the head of the Hillhurst Mansion and is usually the one to keep the house monsters in check. The producers of the show said that he was based on Elvis Presley, but owing to his prominent chin, he bears a stronger resemblance to the comedian Jay Leno.
- Mums (played by Blake Torney, voiced first by Michael Sorich and later by Torney): Mums is a 5,000 year-old Egyptian mummy that used to be a prince, but he can unwrap his bandages to reveal a "Grim Reaper"-like form under his bandages (which only occurred once). He has 703 brothers and sisters. In "Curse of the Mums' Tomb," two archaeologists came to return Mums to the crypt in which they found him in order to get rid of a curse placed on them upon waking him. In the same episode, it was mentioned by Mums that he was mummified alive after he was caught kissing Cleopatra in public.
- Frankenbeans (played by David Fletcher): Called "Frankie" for short, he is a strange, lumbering Frankenstein's monster-type monster. He was once kidnapped by the Magnavores on Halloween, and held for ransom in exchange for the Beetleborgs' Beetle Bonders. He allows Wolfie to stay in a dog house kept in his room. He has little ability to speak, often roaring or saying toddler-like sentences. His creator Dr. Baron von Frankenbeans showed up in a few episodes.
- Count Fangula (Joe Hackett): Loosely modeled after Count Dracula, Count Fangula is a vampire (albeit one of questionable aptitude in the Dark Arts). He seems to be the only one to understand what Wolfie may be saying. He once succeeded into getting two victims in Van and Trip, temporarily turning them into vampires that were turned back to normal by kisses from Jo. If his victims quota is too low, a high ranking vampire will come to evaluate him like his boss Vlad did in "Fangula's Last Bite."
- The Pipettes (Traci Bellusci): A multicolor spirit-like trio of ladies who live in the pipe organ. They act as Flabber's back-up singers. They stop appearing midway through the first series.
- Ghoulum (voiced by Dan Letlow for one episode only): A living stone statue type monster that resides in Hillhurst Mansion who often had little to say or do other than what statues do best, stand in place. While not the most active monster of Hillhurst Mansion on rare occasions he would join in on the other monsters' mischief. In one episode, he was accidentally exposed to a 'Bad Potion' turning him evil and causing him to grow into a giant under Noxic's control.
- Wolfgang "Wolfie" Smith (played by Frank Tahoe, voiced by Michael Sorich, later Scott Page-Pagter): Wolfie is a werewolf and is treated more like a family dog than a monster at Hillhurst. His voice sounds similar to Astro and Scooby-Doo. Only Fangula can translate what Wolfie is saying most of the time since Fangula was once Wolfie's roommate. Probably the bravest and most cunning of the Hillhurst Monsters because he's the only one of the group who tangled with the bad guys at least once.
- Little Ghoul (Lina Godouse): A Jawa-like ghoul who was the latest addition to the Hillhurst group in season two. She lives in the basement and rarely comes out. A niece of the Grim Reaper, she is a grim reaper-in-training who loves collecting. She also has a short temper, which scares the other monsters even more than her true appearance under her hood. She has little to no respect for anyone; she does, however, have a great deal of respect for the Astralborgs. In one episode, she possessed a head that originally belonged to the Headless Horseman.
Famous quotes containing the word inhabitants:
“We may consider each generation as a distinct nation, with a right, by the will of its majority, to bind themselves, but none to bind the succeeding generation, more than the inhabitants of another country.”
—Thomas Jefferson (17431826)