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Geronimo Stilton is a children's chapter book series, created by Elisabetta Dami and originally written and published in Italy, that stars the titular hero, Geronimo Stilton, a mild-mannered and (seemingly) cowardly mouse who works as a famouse journalist (specifically editor and publisher) for The Rodent's Gazette, the most popular newspaper in New Mouse City.

Even though he just wants a quiet life, he can't stop himself from ending up on many different kinds of adventures, ranging from catching master thieves to searching for sunken treasure to racing across America to participating in cooking competitions. He is often accompanied by his sassy sister Thea, his boorish cousin Trap, and his favorite nephew Benjamin.

All of the books are written by Geronimo in first person, detailing all of his thoughts and experiences about the crazy things that come to his doorstep. The illustrations are all in full color and Rainbow Speak in the form of funky fonts is used liberally ala Bold Inflation.

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The books have been successful enough to spawn many Spin-Off series, with the following list being of the ones published in English:

There are also three graphic novel series, the first following historical time travel adventures like The Journey through Time series, the Reporter series, which adapts episodes of the animated series (more on that below), and a series retelling the original series in a Stylistic Suck Dog Man-esque art style (illustrated by Tom Angleberger of Origami Yoda fame). There is also a line of educational workbooks taking excerpts from various entries, and even a Comic-Book Adaptation.

The original book series has been adapted into an animated series as a joint venture by Italy, Canada and other countries; first aired in Italy (Italian) and Canada (English), and shown in several other countries shortly after. The show ran for 3 seasons. Despite being based on the books, the show is about 98% original material.

There are also two theatrical adaptations: the musical theatre adaptation of the Kingdom of Fantasy series that has toured in Spain, Denmark, Belgium, and Canada, and Oregon Children's Theatre's Gerimino Stilton: Mouse in Space, adaptation of the book of the same name.


The books and adaptions include examples of:

    open/close all folders 
    Geronimo Stilton series and all of the books in general 
  • Actually, I Am Him: When Geronimo first met his newly-hired assistant, Pinky Pick, he assumed she was his assistant's daughter, since she's only fourteen years old.
  • All Just a Dream: The Wild, Wild West is revealed to be this in the end since Geronimo had fallen asleep while watching a documentary involving said Wild West.
  • Art Evolution: In the first books, Trap looks different, wearing a white shirt and red suspenders. Later he gets his current look, with the ponytail, earring and Hawaiian shirt. Some reprints of older books redraw him with the current look.
    • Also, the poltergeist that lives in the Cacklefurs' castle is just a Bedsheet Ghost in his first appearance. He gets mouse features in the spinoff series.
  • Barefoot Cartoon Animal: Despite being otherwise fully-dressed, almost none of the characters wear shoes. The most notable aversion is Pinky Pick, and how! Although the Thea Sisters start this way, in the later books they (and most of the other characters) wear shoes more often than not.
  • Bond, James Bond: "My name is Stilton, Geronimo Stilton!"
  • Bowdlerization: In one book, Geronimo goes to buy a new bathing suit and finds that the tag inside reads "I'm too sexy for my fur!" (which is a Shout-Out to the song "I'm Too Sexy For My Shirt" by Right Said Fred). Sometime after the book was published, this was changed to "I'm too cool for my fur!"
  • Cannot Spit It Out: Geronimo constantly trips over his words and babbles incoherently around Petunia Pretty Paws, and never seems to be able to tell her how he feels about her.
  • Cats Are Mean: The titular pirates in Attack of the Bandit Cats and the Saber-Toothed Squad from the Cavemice books.
  • Chaste Toons: Benjamin is Geronimo's favorite (and only) nephew. A rather extreme example, as Geronimo's only mentioned sister, Thea, is not Benjamin's mother, nor is any mention of her made in any of the books (yet). All this despite there being Loads and Loads of Stiltons.
  • Cool Car: Get Into Gear, Stilton! has two of them: Solar, a talking, robotic car with Artificial Intelligence, and its evil equivalent Lunar. Geronimo is the only driver Solar will accept, which isn't surprising once it's revealed that Solar's voice and personality are modeled after Thea, his sister.
  • Cool Shades: Geronimo wears a pair of golden ones in Get into Gear, Stilton! that lets him talk to Solar with his mind.
  • Cut Lex Luthor a Check: Glauseter, the video game company owner. steals an idea for a video game called Ratzilla from a little boy named Chas, and commits numerous crimes in order to keep people from knowing the game was Chas' idea - including wiping their memories with an amnesia machine. Why doesn't he make money off of that and not some Godzilla ripoff game?
  • Creepy Good: Creepella is a creepy mouse with spooky tastes, but she's a good person. Her family is much the same — they're also creepy and strange, but very kind and loving once you get to know them.
  • Death Trap: In Watch Your Whiskers, Stilton!, the game show "The Mousetrap" centers around a gigantic bladed mousetrap that the contestant is chained to.
  • Direct Line to the Author: All the books in the main series are "written by" Geronimo himself, said to be recounts of actual events within his universe. The Cavemice books were written by Geronimo's prehistoric ancestor and translated by present day Geronimo. The Thea Sisters books start with Thea learning about the Sisters' latest adventure, then (supposedly) recounting it.
  • Disguised in Drag: In Paws Off, Cheddarface! Trap is made up to look like Sally Ratmousen in order to counter her Identical Stranger Gambit.
  • A Dog Named "Cat": Bruce Hyena is not a hyena, he's a mouse.
  • Even Evil Has Standards: In The Giant Diamond Robbery, Sally Ratmousen's profile states, "She's known for breaking the rules, except on the golf course, because that's unethical!" This is proven at the end when it's revealed that Sally's cousin, The Shadow, was trying to cheat so she can get away with the diamond while Sally is absolutely shocked that her cousin would do something like that.
  • Expy Coexistence: New Mouse City co-exists with the real-life city it's based on, New York City, as shown in A Very Merry Christmas.
  • Freudian Excuse: Sally Ratmousen's description in Atlantyca's website states that she wanted to work for the Stilton Media Group, but she was rejected and now holds a grudge against them. Also, in Valentine's Day Disaster, it's mentioned that Geronimo once accidentally pushed her into a thorn bush, which might explain her hatred of Geronimo.
  • Hold Your Hippogriffs: The books are stuffed with mouse-ified phrases.
  • How Can Santa Deliver All Those Toys?: Geronimo, subbing in for Santa, learns that Time Stands Still on Christmas Eve, giving Santa enough time to deliver all the presents.
  • Karma Houdini: The Shadow always escapes getting caught for her crimes, ready to thieve again.
  • Mistaken For Flatulence: In "The Secret of Cacklefur Castle", Geronimo sits on a chair and a noise that sounds like flatulence is heard. He sheepishly apologizes, but Creepella reveals that Booey the prankster ghost put a Whoopee Cushion on his chair.
  • Nepotism: Benjamin is the most prominent example but the graphic novels added Cousin Trappy, a female miniature Trap (though she's much more intelligent) and Creepella's niece is a major player in her spin-off.
  • Non-Standard Character Design: Hercule Poirat has a "cartoonier" design than the other mice, complete with Sphere Eyes with dotted pupils and a "cartoony" bump on his snout and near his nose.
  • Not Allowed to Grow Up: You'd think that after all the adventures the gang goes through, they're portrayed as being older.
  • Only Known by Their Nickname: Inverted. Many side characters are referred by name, surname and nickname.
  • Pet the Dog:
    • Sally actually attends Geronimo's Christmas party at the end of one of the books. Also, in Valentine's Day Disaster, at the end, she agrees to send a newspaper to the public for him so that Geronimo will invite her to his Valentine's Day party.
    • The first sign that the Cacklefurs aren't all terrifying is when they find an abandoned baby mouse outside their doorstep and don't hesitate to adopt him as one of them.
  • Plot-Driven Breakdown: In "A Very Merry Christmas," Geronimo accidentally picks up someone else's bag instead of his own. The other person calls her own cellphone and starts to make arrangements for her and Geronimo to meet up and exchange bags, but her phone dies just before she says where to find her.
  • Punctuated! For! Emphasis!: Some lines in the books are irregular and in color to emphasis the characters' thoughts.
  • Punny Name: Hercule Poirat, after Hercule Poirot.
  • Scenery Porn: Later books have BEAUTIFUL backgrounds. Most notably is the Fantasy Kingdom books (The third one has a beautiful depiction of New Mouse City in spring)
  • Rainbow Speak: ᏕᎧ. 𝔽ℝ𝔼𝔸𝕂𝕀ℕ𝔾. 𝓜𝓤𝓒𝓗.note  It's also Bold Inflation, as words in the text and with any level of importance are colored and rendered in larger and fun typefaces.
  • Sequel Hook: Some books end with Geronimo talking about something that happened after the end, saying "But that's another story, which I'll tell you very soon!". None of these sequels happened yetnote .
    • A particular case was the Oliver story. It was a short book about one of Benjamin's schoolmates, the titular Oliver, having problems to move around with his wheelchair. With the help of his friends and Geronimo, he gets the mayor of New Mouse City build more entry ramps in the city, and the story ends with a scene from ten years later where an adult Oliver wins at the Special Olympic Games, with Geronimo's "I'll tell you very soon!" speech, and a advertisement promising a full series starring Oliver and dealing with a different disability in each book. Both of these things never got released, sadly.
  • Stalker with a Crush: Creepella is madly in love with Geronimo and wants him to be her boyfriend, even kidnapping him and shoving him into the back of her hearse to take him to Cacklefur Castle, her family home. Understandably, he doesn't really reciprocate.
  • Stock Animal Diet: The Stiltons and pretty much any character who doesn't have a Species Surname will have one referencing a type of cheese. Geronimo and other mouse characters across adaptations are very fond of cheese.
  • "Too Young to Die" Lamentation: Geronimo thinks one in Curse of the Cheese Pyramid when he thinks his Dirt Cheap Airlines flight is about to crash. The experiences he laments missing out on are climbing Mouse Everest, "trekking through the great Mousewood Forest," and eating a box of popsicles he just bought.
  • Where the Hell Is Springfield?: It is made clear a billion times that Geronimo Stilton takes place on an Earth like ours, with a myriad settings of real-life locations, but where is Mouse Island supposed to be exactly? Mouse Island is located between the Mousific Ocean and Ratalantic Ocean. Mouse Island is stated to be around 110,000 square miles, in which California is a little bigger than that, but the top and bottom have high climates of cold and hot respectively. Since Geronimo Stilton has fantastical elements, Mouse Island probably is supposed to be an Island of Adventure, and the real-world locations are likely to be there only for familiarity and to educate children, maybe we shouldn't have to worry about this at all.
  • World of Funny Animals: The books take place on a version of Earth where everyone is a walking and talking mouse or rat, though giant cats do exist.

Special Edition series

Mini Mystery series

Anniversary editions

    Thea Stilton series and its spin-off series 
  • Covers Always Lie: The cover art of The Dragon's Code shows Thea Stilton discovering the hidden dragon room along with Nicky and Colette. In the actual story, it's Nicky and Paulina who are with Thea in the basement room, not Colette.
  • Distaff Counterpart: A Spin-Off series that also features adventures but is aimed towards female audiences and stars female protagonists. Geronimo's sister, Thea, being the title character should make this clear.
  • Identical Stranger: The Thea Sisters meet a mouseling named Carlotta in The Dancing Shadows, and she and Colette look almost identical aside from a few minor details. The girls later use this resemblance to their advantage to pull a Twin Switch with Colette and Carlotta when the villains try to lock Carlotta in her room to prevent her from competing in the dance audition.
  • Love Before First Sight: In The Prince's Emerald, Prince Lakshan immediately develops a crush on Colette after hearing her laughter at the airport, and spends a fair amount of time trying to find her so he can meet her properly.
  • Love Triangle: Nicky and Paulina get involved in one with their mutual friend Ashvin in The Ice Treasure, with both girls competing for his attention and growing increasingly jealous of each other. Once they realize this rivalry is negatively impacting their friendship, the girls give up their pursuits and let Ashvin get together with Yuko, another girl who also has a crush on him.
  • Nephewism: Paulina's parents went missing some time before the series began, so she and her younger sister Maria live with their aunt and uncle.
  • Secondary Character Title: Despite its title, the series does not focus on Thea Stilton, who ironically is an adventurous Foil to her brother. It instead focuses on a group of her students, the Thea Sisters, and Thea is the one who hears about and (probably) retells their adventures.
  • "The Reason You Suck" Speech:
    • In Mystery in Paris, when Professor Le Blanc starts to bemoan the loss of Fabriçon's designs he'd been searching for, Colette immediately explodes at him for his hypocrisy, as he'd gone behind Julie's back and stolen her clothes to piece together the map in the first place. Le Blanc is staggered by her fury, and while Julie attempts to calm her cousin down, Colette continues her rant and says the professor has no excuse for what he did.
    • In The Dancing Shadows, when one of the most respected dance judges in the world demeans the Thea Sisters' new friend for being self-taught, Violet launches into a tirade about how a ballerina's talent should be how they're judged, not how they trained, stunning the judge and convincing him to give the friend a chance to prove herself.

Special Edition series

  • Covers Always Lie: The cover of The Journey to Atlantis depicts the Thea Sisters exploring the titular lost city. In the book proper, the girls never actually set foot in Atlantis, instead spending the majority of the story travelling the world and trying to get Prince Atlas back home.
  • Evil Former Friend: Professor Quasar, the main antagonist of The Journey to Atlantis, was previously a brilliant scientist employed by the I.S.S.,and a close friend of the institution's founder Mr. Alpha. Despite this friendship, one day Quasar, then known as Mr. Beta, ran off with some highly important research he and Alpha had been working on, and began dedicating his skills to exploiting profitable mysteries.
  • Ship Tease: Paulina and Will Mystery get teased a lot, and it's even clear to many other characters that there is something of a spark between the two. The pair frequently blush around each other when complimented by the other, and even characters outside of the Thea Sisters' group tend to comment on their bond. Will even wakes Paulina up from an enchanted sleep in The Cloud Castle with a kiss on the paw, ala Sleeping Beauty.
  • Translator Microbes: For most of the first half of The Journey to Atlantis, the Thea Sisters have to resort to using pictures in a notebook to communicate with Prince Atlas, who only speaks his native Atlantean. Once the I.I.S. is able to create translator bracelets, the girls are finally able to properly understand him.

Mouseford Academy series

Thea Stilton and the Treasure Seekers series

    The Kingdom of Fantasy series 
  • And Now You Must Marry Me: In the first Kingdom of Fantasy book, Queen Aquafin of the Mermaids tries to marry Geronimo to keep him in her kingdom so he can tell her stories forever. When he escapes along with Scribblehopper and Shelly the sea turtle, she flies into a rage and sends a hurricane after them as punishment.
  • Baleful Polymorph: At the climax of The Dragon Prophecy, King Thunderhorn is revealed to have been cursed by Cackle years ago into assuming the form of a white deer, and is restored to his true elven form when Geronimo uses the magic healing water from the Garden of the Seven Sisters on him.
  • Beauty Is Bad: Queen Cackle of the Witches is a striking beauty with vibrant red hair and elegant features, but is also a cruel and sadistic tyrant who regularly plots to take over the Kingdom of Fantasy.
  • Belligerent Sexual Tension: Thunderhorn and Sterling spend most of the first half of The Volcano of Fire arguing with each other over who's ideas are better, but after falling into the Fountain of Love, they start to suddenly treat each other with much more affection and respect. The book ends with the pair getting engaged, and Vol pointing out that falling into the fountain didn't make them fall in love, rather they were already in love with each other but were too stubborn/shy to admit it.
  • Big Creepy-Crawlies: Arachne, guardian of the Kingdom of the Witches, is a Giant Spider about the size of a three story building.
  • Chuck Cunningham Syndrome: Several of Geronimo's traveling companions get this treatment, with some disappearing altogether with no explanation or only turning up occasionally in background shots.
  • Cypher Language: The Fantasian Aplahabet, a written language common throughout the entire Kingdom of Fantasy which uses 26 unique cubic symbols to substitute for the letters of the English alphabet.
  • Elective Mute: Princess Snowy Dawn in Quest for Paradise does not speak, owing to a traumatic childhood accident that resulted in the death of her parents. She instead chooses to communicate with short sentences written on note cards. By the end of the group's adventure, she's so overcome by gratitude for her new friends that she bursts into tears and finally starts to speak again.
  • Endless Winter: In The Amazing Voyage, the Kingdom of Fantasy is in danger of being consumed by an endless winter when Blossom is captured, and it's up to Geronimo and his companions to rescue Blossom from the Land of Nightmares to restore spring to the land.
  • Evil Twin: The Phoenix of Destiny has Geronimo running all across the Kingdom of Fantasy at the behest of who he believes is Blossom, but is later revealed to be Blossom's long-lost twin sister Wither, who made a pact with Cackle to overthrow Blossom and take over the Kingdom of the Fairies.
  • Fallen Princess: The Amazing Voyage introduces Beatrice, who was once Queen of the Southern Giants before her kingdom was taken over by Cackle's forces and she was imprisoned in the Land of Nightmares. She eventually regains her status by marrying Strongheart, the last king of the Northern Giants.
  • Four-Seasons Level: The Garden of the Seven Sisters from The Dragon Prophecy is a magical garden divided between the four seasons and is ruled by a family of seasonally themed nymph sisters.
    • The Spring garden is ruled by the youngest sisters, Primrose and Breeze. Primrose has the power to make the flowers bloom, while Breeze is the mischievous one who controls the spring wind.
    • The Summer garden is guarded by Peachflower and Seedling, with Peachflower overseeing the cultivation of fruits and Seedling being responsible for most plants in general.
    • The Autumn garden has Hourly and Crystal, the nymphs of time and water respectively. Hourly is an impatient sort who has power over time, and Crystal is a patient young lady who gifts Geronimo the healing water he later uses on Thunderhorn.
    • The Winter garden, the largest and last section of the seasonal gardens, is ruled by Arctica, the eldest sister. It's implied that despite appearing as a statue, Arctica can move and speak, but chooses not to because she prefers silence over anything.
  • Gemstone Motifs: The seven central kingdoms in the Kingdom of Fantasy each have a signature gemstone linked to them, and said gemstones each form a magical door that allows for passage between the realms.
    • Kingdom of the Witches: Ruby
    • Kingdom of the Mermaids: Topaz
    • Kingdom of the Dragons: Citrine
    • Kingdom of the Pixies: Emerald
    • Kingdom of the Gnomes: Sapphire
    • Kingdom of the Giants: Amethyst
    • Kingdom of the Fairies: Diamond
  • God Save Us from the Queen!: Cackle, Queen of the Witches and prime antagonist of the series. Later books also introduce Wither, Queen of the Dark Fairies and Blossom's Evil Twin sister.
  • Good Feels Good: This is Blossom's main philosophy, insisting to King Grim that "evil dries you up; goodness makes you happy". This line ends up being the catalyst that pushes Grim over the edge into heroism and causes him to turn on his half-sister Cackle.
  • Gotta Catch Them All: The Enchanted Charms involves Geronimo journeying around multiple kingdoms to locate the titular seven charms to prevent them from falling into the hands of the Wizard of the Black Pearl.
  • Green-Eyed Monster: King Firebreath III doesn't bother to even try hiding his jealousy of Geronimo and Sterling in The Dragon Prophecy, to the point where he goes behind Sterling's back and makes a deal with Cackle to abduct the last dragon egg in exchange for becoming king of all the dragons.
  • Happily Adopted: In The Quest for Paradise, Geronimo reveals that he was adopted by the Stilton family when he was just a baby. And in The Guardian of the Realm, Queen Blossom herself formally adopts Geronimo as her brother, making him an official part of the royal dynasty of the Winged Ones.
  • The High Queen: Blossom, the Queen of the Fairies, is very regal and wise, and is considered by most to be the queen of the entire Kingdom of Fantasy.
  • It's the Journey That Counts: Towards the end of Quest for Paradise, Blossom has one of her servants return the Heart of Happiness to the cave, and when Geronimo raises a protest to her decree, she tells him that the heart was never the real purpose of his journey, and that happiness is what you experience, not something you can hold.
  • Insistent Terminology: Geronimo spends most of the first book insisting to anyone who will listen that he's just an ordinary mouse, not a knight. No one really believes him, and eventually he learns to accept it.
  • Kill and Replace: The kid-friendly 'imprison and replace' is used in The Phoenix of Destiny when the evil Wither impersonates her twin sister Blossom so she and Cackle can rule the fairies.
  • Living Statue:
    • Queen Dorothy of the Land of Gold is a sentient golden statue.
    • Arctica, the eldest nymph sister from The Dragon Prophecy, is heavily implied to be fully capable of movement and speech, but prefers to appear as a statue because she prefers silence.
  • Malevolent Masked Men: King Grim of the Land of Nightmares wears a grey stone mask and commands an army of stone golems who wear similar masks. He loses the mask in a battle with Cackle to defend Blossom, prompting his Heel–Face Turn and eventual name change.
  • Meaningful Rename: In The Amazing Voyage, the newly redeemed Grim announces that in addition to now being engaged to Blossom, he's decided to changing his name to "George", which Geronimo agrees is a much more pleasant-sounding name for Queen Blossom's new consort.
  • Mistreatment-Induced Betrayal: Boils the chameleon initially worked for Cackle as a spy for her cause, under the promise that she would reward him with a lifetime supply of candy. But when Cackle refuses to honor her end of the deal and literally throws Boils away, he switches sides and joins Geronimo.
  • Modest Royalty: Factual and Cozy, the king and queen of the gnomes, dress in the same modest attire as their subjects.
  • No Sense of Direction: Princess Scatterbrain, King Firebreath's neice, gets lost extremely easily, owing to her skimping out on her geography homework. When she's chosen by her uncle to lead Geronimo and Scribblehopper to the Kingdom of the Pixies, she winds up leading them in circles around the borders of the kingdom before Geronimo calls her out on it.
  • Really 700 Years Old: Queen Blossom is described as looking to be both very young and hundreds of years old at the same time.
  • Sweet Tooth: Boils the chameleon has an insatiable appetite for candy and sweets. When Geronimo and his companions visit the Land of Sweets in Quest for Paradise, Boils spends most of his time eating as much candy as possible. Unsurprisingly, he winds up making himself sick as a result.
  • Weddings for Everyone: The Amazing Voyage ends with a triple wedding between Blossom and George, Strongheart and Beatrice, and Boils and his girlfriend.

Special Edition series

    Creepella von Cacklefur series 
  • Aluminum Christmas Trees: According to Chef Stewrat, his stew has been cooking for 500 years and keeps getting new ingredients added to it. Such a thing is possible, called perpetual stew, although it usually doesn't last that long.
  • Arson, Murder, and Jaywalking: Chef Stewrat's long and very disgusting list of ingredients for his stew recipe ends with "...[plus] a little salt and pepper!"
  • Dark Is Not Evil: The Cacklefurs who live in a dreary castle but are shown to be very nice and friendly among other things.
  • Shout-Out: In "The Secret of Cacklefur Castle," the Cacklefurs have a pet cockroach named Kafka, a reference to The Metamorphosis.
  • Smelly Feet: Supposedly, Boneham the Cacklefurs' butler has stinky socks, which is odd because the illustrations show him not wearing shoes, like practically every other named character.
  • Supreme Chef: Chef Stewrat, the Cacklefur family's personal chef, cooks a delicious stew. (Just don't ask what's in it.)

    Cavemice series 

    Heromice series 

    Spacemice series 

    Micekings series 

    The Journey through Time series 

    Classic Tales series 
Thea Stilton spin-off

    Graphic novel series 
First graphic novel series

Thea Stilton series

Reporter series

Geronimo Stilton the Graphic Novel series

    Animated TV series adaptation 
  • Abhorrent Admirer:
    • Geronimo gets one in the form of the Contessa in the S2 episode "Bloodlines".
    • Thea has one in a few villains, notably Prince Nogouda who repeatedly attempts to force her to marry him.
  • Adapted Out: The show leaves out a huge number of characters from the books.
  • Adaptational Attractiveness: Downplayed with Sally, who is much better dressed than her book counterpart but is still not much to look at.
  • Adaptational Badass: While still somewhat a Nervous Wreck and a Butt-Monkey, Geronimo is noticeably braver than in the books.
  • Adaptational Jerkass: In the books, Sally Rasmaussen had some degree of sympathetic qualities. In the cartoon, she has virtually none, being pretty much a Hate Sink.
  • Adaptational Mundanity: While the book series is still quite grounded in reality, occasionally there are a few fantastical elements, notably whenever Creepela von Cacklefur appears. The animation however drops all of it in favor of sci-fi and Scooby-Doo Hoaxes; Geronimo in particular is adamant there's no such thing as the supernatural.
  • Adaptational Nonsapience: Cats in the show are all non-anthropomorphic and smaller than the anthropomorphic mice, unlike in the books where large anthropomorphic cats exist.
  • Adaptational Personality Change:
  • Affectionate Nickname: Benjamin has two for Geronimo, "Uncle G" and "Unc".
  • Age Lift: As mentioned above, Benjamin goes from 8-9 years old in the books to 12 years old in the series.
  • Artistic License – Biology:
    • "If I Could Talk to the Animals" had a pride of lions consisting of mostly males and only one female. In real life, females outnumber the males.
    • "A Tall Order" involves the protagonists trying to talk to a giraffe. Surprisingly that's not the problem; they have a Universal Translator. What is, however, is that the giraffe wasn't talking because they're mute, which is based on an old misconception that giraffes were mute because they very rarely made sound.
  • Bad Boss: Sally to Simon. Even when he performs well, she berates, mistreats and insults him.
  • Barefoot Cartoon Animal: Just as in the original books. However, as a variation, they do put on the needed footwear once they venture out of civilization (or travel somewhere very cold).
  • Bigfoot, Sasquatch, and Yeti: Big Toes, from the S2 episode "The Legend Of Big Toes". Though he's actually no different from the humanoid mice in the show; only much, much taller, hairier, and being speechless.
  • Bluff the Eavesdropper: Geronimo is tasked with keeping a singer's identity secret, while Sally Rasmaussen has Simon spy on him in order to get the scoop on the singer's identity. Geronimo's solution: say the name of a different singer out loud for Simon to hear, and have a Disguised in Drag Trap impersonate the fake singer.
  • Broken Pedestal: If someone is introduced as being an old friend or former mentor of Geronimo's, they have a rather disturbing tendency to turn out to be a villain. Poor Geronimo has seen more of his former heroes turn out to be complete bastards than a lot of other protagonists.
  • Butt-Monkey:
    • Trap is more of this than his cousin Geronimo was in the original books.
    • Simon Squealer is this, too.
    • And of course, Geronimo himself.
  • Charlie and the Chocolate Parody: "Chauncey and the Secret Cheese" plays this mostly straight. Benjamin and Pandora win a contest to tour a top-secret bizarrely-built, whimsical factory run by The Wonka.
  • Composite Character: Benjamin in the TV series appears to be given the role and personality of his counterpart in the book series and Pinky Pick.
  • Chekhov's Gun: At the beginning of "The Mask of Rat-Jitsu", Geronimo takes out a vial of a rare, strong-smelling cheese from his safe and inadvertently puts it in his clothes. He finally got to use it during the said episode's climax to knock out the villain of the episode and his mooks.
  • The Chessmaster: Crunchrat is prone to be this way.
  • Crouching Moron, Hidden Badass: Geronimo can sometimes be capable of overcoming his clumsiness and apparent cowardice when the chips are really down, and Trap has his moments, too. Most notable of all is Simon Squealer, Minion with an F in Evil extraordinaire, who, while usually a clumsy and incompetent Smug Snake, is shown to possess martial arts skills that make him an even match for Thea!
  • Even Evil Has Standards: Barry the Moustache is a hardened criminal at first, anyway, but even he is outraged at Sally Rasmaussen falsely accusing him of kidnapping in her scheme to humiliate Geronimo .
  • Everything Is Online: The only explanation on how Benjamin could hack into almost anything.
  • Evil Twin: Geronimo deals with one in Paws Off, Cheddarface.
  • Full-Body Disguise: "The Gator Samaritan" featured Simon Squealer dressing up as the titular superhero this way (using a form-fitting alligator costume complete with tail) and performing good deeds as part of a scam to help the struggling Daily Rat newspaper. After saving Thea from drowning, Simon realizes Good Feels Good and continues the charade independently from the scam. But then a criminal rat steals the costume's Latex Perfection mask and attempts to use it as a simple disguise for robbing a museum...
  • Furry Confusion: Non-anthropomorphic rats have appeared in some episodes. Downplayed in that only mice are anthropomorphic.
  • Good Feels Good: Simon comes to this realization when he impersonates a superhero and rescues Thea from drowning. Unfortunately for him, it only leads to a Heel–Face Door-Slam.
  • Hollywood Hacking: Benjamin does this in spades.
  • Hurricane of Puns: Expect a lot of rodent and cheese puns. Some of them might be funny.
  • Hypno Fool: Geronimo becomes one in "Hypno Tick Tock", courtesy of an evil hypnotist who plans to Mind Control the entire city.
  • I Have Your Wife: In the Season 2 episode "Searats", Thea and Benjamin end up forced to help pirates recover an underwater treasure because they've kidnapped Geronimo. Similarly, several episodes feature one or more members of the Stilton family being used in some fashion as leverage against the others; oddly, this usually is used against Geronimo.
  • Inevitable Waterfall: In the S2 episode "The Legend Of Big Toes", Geronimo was tricked into falling into the river and almost fell down one of these. He was saved by the titular Big Toes.
  • Intergenerational Friendship: Pandora with Geronimo and Thea, particularly in the animated series and graphic novels. Geronimo lets Pandora into his inner circle and often brings her on his adventures, and Thea is like a Cool Big Sis to her. In at least one of the graphic novels, Pandora goes as far as to call Geronimo "Uncle G".
  • Karma Houdini: Crunchrat has a tendency to escape arrest and punishment for his crimes.
  • The Lab Rat: Literally in Professor Von Volt's case.
  • The Millstone: Though Trap obviously means well, he is generally more of a hindrance to Geronimo than a help.
  • Mistaken for Romance: In Season 3 Episode 13, Pandora overhears acrobat partners Cheesy and Moonbeam arguing about her relationship with the kidnapped clown Augusto and assumes that Cheesy had something to do with the kidnapping because he couldn't stand losing Moonbeam's affections to the clown. When Geronimo confronts him about it, Cheesy laughs and explains that Moonbeam is his sister, who planned to quit their act and join her fiance in clowning.
  • Not What It Looks Like: In one episode, Geronimo comes home to hear what sounds like someone threatening Benjamin for information; when he naturally rushes to the rescue, he discovers Benjamin was just helping Trap rehearse for a play.
    • A later episode features Trap having ordered a crate of bottles filled with a red liquid and offering some to Benjamin. Geronimo indignantly protests that Benjamin is much too young to drink, only for Trap and Benjamin to start dipping carrot sticks into what is revealed to be vintage-aged ketchup.
  • The One Who Wears Shoes: Sally Rasmaussen wears a pair of killer heels. When she's not actually kidnapped by the titular gangster in "Barry the Moustache", Geronimo and company find a clue when she loses a shoe in the struggle.
  • Red Herring: Although the show is usually pretty straightforward with who the villain is, there have been a few exceptions where the character everyone suspects is innocent:
    • One episode had tomb-robbing in Egypt. Everyone suspected it to be the work of a kindly professor's shifty nephew with a Dark and Troubled Past who nobody trusted. It is eventually revealed it was his seemingly benevolent uncle and not him all along.
    • Another episode had Benjamin and Pandora visiting a cheese factory owned by Chauncey, when someone steals the only sample of a new kind of cheese. When it is learned one of the other kids in the tour is the son of a rival factory owner, everyone suspects him. But it is eventually revealed to be Chauncey's assistant, who wanted revenge on his boss because Chauncey only paid him in cheese. It turns out he was in cahoots with Sally Rasmaussen, who wanted the scoop on the new cheese.
    • Geronimo and the gang went on a fashion shoot tour with a pair of hip (and strange) European fashion photographers, and everywhere they went, someone was robbed. Local police arrested Thea for it, and it seems as though the photographers are the real thieves who are just using the shoot as a cover for their crimes, but it eventually turns out to be the shoot's makeup artist, with the photographers entirely innocent and the shoot genuine.
  • Reformed Criminal: Barry the Moustache. He was a notorious crime boss who was inadvertently apprehended by Geronimo, and swore revenge as he is being arrested. However, in prison Barry meets his future business partner, who teaches him he can make more money as a legitimate businessman. At the end of his episode, Barry is revealed to be rich and the owner of his own private island, and is grateful to Geronimo.
  • Reused Character Design: The show has a few examples of this, but the most prominent are the two (or three?) large Mooks in black business suits. They're first used as Prince Nogouda's bodyguards, but later turn up in a variety of roles, either as private security (for good guys) or henchmen (for bad guys). Basically any time the episode calls for one or more big, tough-looking mice, these guys get drafted. In their most recent appearances, they've been doing muscle work for Sally. Either the animators are just really lazy... or it really is the same two or three guys working different jobs each time.
  • Rodents of Unusual Size: The mice, not to mention some other anthropomorphic animals, are human-sized.
  • Save the Villain: Zigzagged in "Barry The Moustache". Geronimo helps Simon look for Sally after she is reportedly kidnapped by the titular crime boss. It is subverted when it turns out that Sally faked her own kidnapping in a scheme to humiliate Geronimo. Then it is played straight when the real Barry the Moustache shows up, angry at having been wrongfully accused, and kidnaps them for real, forcing Geronimo to save Sally, Trap and himself. Finally, it subverted again when Barry is revealed to be a Reformed Criminal who did not mean them any harm, though Sally is punished by having to be the spokesperson for Barry's cheese snack company.
  • Say My Name: "Crunchrat!"
  • Seldom-Seen Species:
    • Arctic cod and ringed seals appear in "Pole Rat".
    • The S2 episode "Dude, Where's My Shark?" featured a copper shark.
  • Terrified of Germs: Prince Nogouda is a total germaphobe. The Stiltons use this as an advantage to escape from him.
  • The Unfettered: Sally Rasmaussen will stop at nothing to scoop Geronimo, humiliate him or otherwise enrich herself, up to and including committing actual crimes.
  • Voices Are Mental: Averted - in the "Freaky Friday" Flip episode "Trade Off" Geronimo and Sally switch bodies but their voices aren't switched along with it. Geronimo-in-Sally's-body even remarks on his changed voice.

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