Monsters are the creatures featured in Aaahh!!! Real Monsters. According to Attack of the Blobs there are multiple species of monster.
Biology

Biology with the Gromble
Physiology
Monsters have a seemingly unlimited variance in appearance, although ones who are related may share similar traits. Relative to humans, monsters are fairly small, averaging around 1–3 feet in height. Monsters' bodies are extremely pliable and are capable of expanding to several times their original size or squeezing through small pipes with proper training.
Reproduction
Monster reproduction is a seemingly elaborate ritual involving placing the elbow on the knee, putting the thumb on the nose and waving the hand, ending with touching fingertips and forming a blob which hatches into a bonsty 30 days later.
Physical Development
While little is known about monsters' physical development beyond the earliest stages, it seems likely that they experience rapid development early in life which slows down when they reach adolescence. Aging from adolescence through late adulthood seems to progress very slowly, lasting hundreds of years. Aging may then speed up again when monsters reach old age. This would explain the extremely low numbers of juvenile and elderly monsters relative to adolescents and adults.
Weaknesses
Monsters cannot survive in the oxygen-rich human world without first filling their breathing sacks with putrid air. Exposure to perfumes and air fresheners can incapacitate monsters and cause Nolox.
As shown in Garbage In, Garbage Out, monsters are extremely susceptible to starvation, and will begin to waste away after only a few days without food.
Monsters shouldn't consume any human foods because it's extremely hazardous to their health. Sometimes caused them to sleepwalk, shown in Wake Me When It's Over when Ickis ate a chocolate bunny candy. Also they shouldn't eat anything comes from a tree or they turned into trees themselves, shown in The Tree of Ickis and need termites crawled on them to reversed the procress.
Soap and clean purified water is also hazardous to monsters' health.
Diet
Monsters primarily eat garbage, and are shown to be capable on injecting almost anything from insects to metal. Monsters also sometimes eat other monsters, as seen in Monsters, Get Real! and also Oblina did threaten to eat Ickis in The Rival.
Language
The Gromble, Shroink, and Oblina have been heard speaking incomprehensible gibberish that may actually be a monster language. Monsters also their own unique terminology for many things, see: Monsters/Terminology.
Origin
It is unknown where the monsters come from but it said that they arrive to earth in the cave man ages. They are responsible for changing the world and become what they are now. The monsters started to live in the sewers during the medieval ages. When the 20th century came, railroads and factories are building creating toxic gases to monsters to breathe.
Characteristics
Monster's often have different shapes and looks. For skin, monsters have fur, that resemble mammals, scales that resemble reptiles, and flesh that resemble humans. Monsters have unique scaring abilities so they switch between scare mode and normal mode. Usually, they have different eye shapes, tails, texture and voices.
Abilities
Minor and Unnamed Monsters
The following monster characters are unnamed and/or only have minor appearances in the episodes in which they appear. Note: several names on this list come from the class list seen in Monsters Are Fun and seating chart from The Master Monster.
Name | Description |
---|---|
#13 | ![]() |
#20 |
![]() Voiced by Ron Fassler |
3-Eyes |
![]() Bears a strong resemblance to Stazula. Voiced by Loren Lester |
Basketball Monster | ![]() |
Basketball-Playing Monster | ![]() |
Betting Monsters |
![]() ![]() The monster taking the bets is tall and teal with six arms. In addition to several reoccurring monsters there are three more monsters only appearing in this scene. Monster 1 (seen only from back): Grey with rounded ractangular body and bulbous hands with claws. Places a bet of five tonails on Krum. Likely voiced by Rodney Saulsberry. Monster 2 (seen only from back): Yellow monster with large head and a single horn. may be the "Monster 2" who bets eight worms and a leech on Krum voiced by Tazia Valenza, although this line may have been ment to come from Dizzle or Stazula. Monster 3: Tall round peach-colored monster with stubby limbs, purple lips, and small eyes. Places a bet of fifteen maggots on Ickis... to lose. Likely voiced by Gregg Berger. |
Camera Monster | ![]() |
Cheerleader Monster |
![]() The role of "Cheerleader" is credited to Charlie Adler, Christine Cavanaugh, and Angel Harper. |
Danka | ![]() |
Dazumbie Pink Slug-Eyed Monster |
![]() Pink Slug-Eyed Monster is pink with thick eyestalks. It is also the only regular background monster whose name does not appear on The Gromble's class ranking chart in Monsters Are Fun and cannot be seen on the class seating chart in The Master Monster. |
Doybu Izzith |
![]() Doybu appears similar to Snill, but green with long legs. Izzith has four legs and a long nose. |
Geometric Monster |
![]() Pink with an odly angular head. |
Jack-o'-lantern Monster Round Purple Monster |
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Jump Rope Monster | ![]() |
Nerdy Monster |
![]() Voiced by David Eccles |
Ocka | ![]() |
Offended Monster | ![]() |
Korga Red-Eye Tusked Monster |
![]() Korga usually sits in the back row of the middle-left column of the Lecture Hall. Red-Eye Tusked Monster sits in the back row of the middle-right column. |
Pencil-Headed Monster | ![]() |
Running Nose Monster | ![]() |
Scoreboard Monsters | ![]() |
Shroink |
![]() ![]() |
Splazu | ![]() |
Spoop |
![]() |
Swamwump | Swamwump is a lavender monster who wears a neck brace and has a magenta mustache and antennae.![]() |
Tamfo Uwapo |
![]() Tamfo has an appearance very similar to Snill, but red in color. Where Have All the Monsters Gone? suggests they may be part of a sub-group of monsters called trolls. Tamfo is voiced by Gregg Berger in Spontaneously Combustible. Uwapo is a round brown monster who is voiced by Rodney Saulsberry. |
Triangle Monster | ![]() |
Vendor |
![]() The vendor is voiced by Tim Curry |
Whistle Monsters |
![]() ![]() Krumm uses a whistle monster in Curse of the Krumm while working as a crossing guard. Zooeuh is seen during the basketball game in Smile and Say Oblina, and again used by Ickis in Things That Go Bump. |
Zooeuh | Zooeuh is a purple monster with three tufts of blue hair. He is voiced by Kevin Michael Richardson in "Slick Ick". |
Unknown Credited Monsters
The following monster characters appear in the credits of an episode, but have not been linked to a specific character.
Credited Name | Details |
---|---|
2-Heads | Appears in Monsters, Get Real!/Snorched If You Do, Snorched If You Don't; voiced by Paddi Edwards. Presumably a monster, although no 2-headed monsters appear in these episodes. |
Monster #1 | Appears in Curse of the Krumm/Krumm Goes Hollywood; voiced by Neal McDonough. |
Monster #2 | Appears in Curse of the Krumm/Krumm Goes Hollywood; voiced by Loren Lester |
Monster 1 | Appears in The Switching Hour; voiced by E. Faye Butler |
Monster 2 | Appears in The Switching Hour; voiced by Ron Taylor |
Monster 2 | Appears in The Switching Hour; voiced by Jim Cummings |
Schvitz | Appears in Curse of the Krumm/Krumm Goes Hollywood; voiced by Scott LaRose. Possibly a monster, based on name. |
Thornk | Appears in Curse of the Krumm/Krumm Goes Hollywood; voiced by Charlie Adler. Possibly a monster, based on name. |