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Voiced by: Barrie InghamA detective, based on the fictional sleuth Sherlock Holmes. His main goal is to get Professor Ratigan behind bars and rescue Olivia Flaversham's father, while simultaneously preventing a royal assassination.
- Adorkable: Basil gets adorably awkward several times when he's not being unfriendly. Notable moments include after how awkward and tongue-tied he gets after Olivia's My Parents Are Dead moment and the scene where he's awkwardly trying to cheer up Dawson. "I say...Dawson, old chap?" with a nervous smile.
- Badass Bookworm: What do you expect from somebody based on Sherlock Holmes?
- Break the Haughty: After falling into Ratigan's trap:Basil: Oh, it's finally happened. I've been OUTWITTED!
- Bunny-Ears Lawyer: Like Sherlock, he may be eccentric, but he solves the case.
- Cultured Badass: Being a Sherlock Holmes expy and an Omnidisciplinary Scientist, he shows skill in various areas such as science and history.
- Deadpan Snarker: He has a good sarcastic humor.
- Defrosting Ice King: Is pretty dismissive of Olivia and Dawson when first meeting them; eventually he warms up to the pair (even insisting that he does all his cases with Dawson).
- Detective Animal: Naturally, he's a mouse. He currently provides the trope page image.
- Disney Death: He falls from the clocktower, but manages to fly back up with a piece of Ratigan's contraption.
- Distinguished Gentleman's Pipe: Sherlock Holmes is probably the Trope Codifier of this trope, and Basil is based on him.
- Expy: A take-off of the classic Sherlock Holmes character.
- Good Is Not Nice: Basil comes across as somewhat rude, especially early in the film, which makes him a good contrast to the Faux Affably Evil Ratigan. Fitting, since the original Holmes can be somewhat of a Jerkass Insufferable Genius himself at times.
- Good Smoking, Evil Smoking: He smokes a pipe while Ratigan smokes a cigarette. And he switches to a cigarette for his "tough guy sailor" disguise.
- Heroic B.S.O.D.: Basil undergoes a near-fatal one after he falls for Ratigan's trap.
- Heterosexual Life-Partners: With Dawson.
- Jerk with a Heart of Gold: Moody, rude and self-centered but undeniably a good guy. He does slowly grow out of his rude Jerkass attitude, as seen when he tries to comfort Dawson. Granted, he doesn't actually apologise for his rant, but it's clear from the look on his face that he regrets being so harsh.
- Large Ham: The incredibly expressive, hyperactive unless quite visibly depressed, always overdramatic Basil.
- "Young lady, you are most definitely not accompanying us! AND THAT IS FINAL !!!
- Nice Hat: The iconic deerstalker.
- Nice Mice: He may not be nice, but he's still good.
- No Social Skills: He is downright rude towards Olivia and seems to be very very uncomfortable while trying to cheer up Dawson.
- Not Now, Kiddo: When Olivia and Dawson first meet him, he's too preoccupied with examining a bullet which might provide evidence to Ratigan's location to listen to what they're saying. And when they finally get his attention, he's less than interested in helping Olivia find her father...until he learns that Ratigan is involved.
- Omnidisciplinary Scientist: Music, chemistry, physics, mathematics, botanics, zoology... He's a Sherlock Holmes expy, so this is a given. He's probably also the most intelligent Disney Hero until Milo Thatch.
- Only One Name: Basil—notable because every other character has stated surnames. Most likely, Basil is his surname.
- Rude Hero, Nice Sidekick: Basil, a Good Is Not Nice detective, has a tendency to be brusque and unconcerned with others (he has No Social Skills), while Dr. Dawson is an Adorkable Sensitive Guy who gets involved in the adventure to begin with because he can't stand to see a little girl cry. Given that this is a Sherlock Holmes story with mice, the dynamic between Basil and Dawson mirrors the one between Holmes and Watson. This being Disney, he (and Olivia) wind up defrosting Basil.
- Running Gag: He constantly gets Olivia's surname wrong.
- Sensitive Guy and Manly Man: The Manly Man to Dawson's Sensitive Guy.
- Sesquipedalian Loquaciousness: Being the genius he is, Basil does this quite a bit, confusing or impressing Dawson at times.
- Technobabble: Basil spouts some while analyzing Ratigan's Death Trap.
- ˇThree Amigos!: Before Olivia gets kidnapped, he, Dawson, and Olivia certainly fit this trope while they're investigating the toyshop.
- Title Character: Basil is the "Great Mouse Detective".
- Tsundere: A minor Type A version. He starts out preoccupied, a bit detached from Dawson and Olivia, but they can bring out his sweeter, more empathetic side at times.
Major Dr. David Q. Dawson
Voiced by: Val BettinPreviously of the Queen's 66th Regiment in Afghanistan. His character is based upon Dr. John H. Watson from the Sherlock Holmes stories. The interaction between him and Basil mimics that of Watson and Holmes, as Dawson is constantly amazed by Basil's deductions. He eventually becomes Basil's associate, friend, and personal biographer.
- Adorkable: Slightly clumsy and awkward, but very friendly.
- Alliterative Name: David Q. Dawson.
- Borrowed Catchphrase: Dawson says "You're despicable!" when he and Basil are tied up in a giant mouse trap by Ratigan.
- Butt-Monkey: The movie's most frequent victim of comic mishaps and slapstick abuse.
- Expy: Inspired by Sherlock Holmes's partner John Watson, most notably by Nigel Bruce's portrayal of the character.
- Fat Best Friend: To Basil.
- Fat and Skinny: Fat to Basil's Skinny.
- Heterosexual Life-Partners: With Basil.
- The Lancer: Basil's sidekick.
- Last Name Basis: Never called by his first name, similar to Watson.
- Minion with an F in Evil: When in disguised as a ruthless shipmate, is still as polite as ever. Basil can't help but groan every time he does this.
- Nice Guy: He may not be the sharpest knife in the drawer, but Dawson is above all a decent and kindhearted person who would give you the shirt off his back if needed.
- Nice Mice: Compared to Basil, Dawson is more polite and respectful.
- Older Sidekick: Heavily hinted to be so.
- Sensitive Guy and Manly Man: The Sensitive Guy to Basil's Manly Man.
- Sidekick: To Basil.
- The Watson: He's an expy of Dr. John Watson, the Trope Namer.
Voiced by: Susanne PollatschekA six-year-old female mouse of Scottish descent who seeks Basil's help in finding her toymaker father.
- Accidental Misnaming: Basil has a habit of constantly getting her surname wrong.
- Badass Adorable: See The Cutie and Little Miss Badass.
- The Cutie: Innocent, cute little mouse girl.
- Daddy's Girl: She's very close to her father.
- Damsel in Distress: Ratigan eventually succeeds in kidnapping her to manipulate her father.
- Kid-Appeal Character: A weak but lovable type of this.
- Little Miss Badass: She stands her ground much more than you'd expect her to.Olivia: [to Ratigan] Just wait! Basil's smarter than you! He's going to put you in jail! He's not afraid of a big, old, ugly rat like you!
- Missing Mom: Continuing a long Disney tradition...
- My Parents Are Dead: She gains Basil's sympathy when she flat-out tells him she doesn't have a mother to go to for help finding her missing father.
- Nice Hat: A cute little tam o' shanter, of course.
- Nice Mice: Obviously, she's a friendly Nice Girl.
- Panty Shot: Rather harmless considering her age, and that she's a mouse.
- Plucky Girl: Olivia shows shades of this near the climax of the film.
- Ridiculously Cute Critter: Just look at this◊.
Voiced by: Alan YoungOlivia's loving Scottish father. He works as a toymaker, and is kidnapped by Fidget to make the Queen Mousetoria robot for the evil Ratigan.
- Brave Scot: Defiantly stands up to Ratigan and refuses to assist him with his scheme, even if it would cost him his life; he only relents when his daughter is threatened instead.
- Distressed Dude: He is kidnapped by Fidget to create the clockwork Mouse Queen for Professor Ratigan.
- Gadgeteer Genius: He is a toymaker, after all. It's why Ratigan went after him in the first place.
- Good Parents: A very loving parent to Olivia.
- Kidnapped Scientist: Flaversham is a toymaker, but he qualifies. His skill with making mechanical toys had applications for chicanery that Ratigan made forcible use of.
- Last Name Basis: Usually called by his last name.
- Nerd Glasses: Has big eyeglasses, and he's a techno-savvy toymaker.
- Nice Mice: Despite being a relatively minor character, he's undoubtedly a Nice Guy.
- Parents in Distress: His kidnapping is what sets off the whole plot.
- Reluctant Mad Scientist: Forced to use his talents for Ratigan's evil scheme so Ratigan won't hurt Olivia.
Voiced by: Frank WelkerBasil's trustful Basset Hound. He technically belongs to Sherlock Holmes, who lives above Basil.
- Big, Friendly Dog: The emphasis here is on big, since the main characters are mice.
- The Big Guy: Much bigger than the other characters. While not sapient, he still helps Basil by carrying him around and following scent trails.
- Canine Companion: He's the dog of Sherlock Holmes, but also a loyal friend to Basil.
- Female Feline, Male Mutt: Male Mutt to Felicia's Female Feline, although they are enemies.
- Friend to All Children: Quickly warms to Olivia - she has an easier time instructing him than Basil does, to his consternation.
- Heroic Dog: He helps Basil solve cases.
- Interspecies Friendship: He gets along quite well with Basil, and Basil's own companions for that matter.
Professor (Padraic) Ratigan
Voiced by: Vincent Price (The Great Mouse Detective), Corey Burton (audiobook), Maurice LaMarche (House of Mouse)Basil's archenemy. He is based on Professor Moriarty from the Sherlock Holmes stories. He plots to seize control of the British monarchy.
- Adaptation Species Change: In the original Basil of Baker Street books he was a mouse. The film changed him into an actual rat, making the name more meaningful.
- All There in the Script: His first name is Padraic. This makes sense, as—in various forms—it is one of the most common given names in Ireland, much like Moriarty is a common Irish surname. Furthermore, the name 'Padraic'note means "noble man" or "of noble birth" and becoming nobility (or royalty) is Ratigan's goal.
- Ambiguously Gay:
- Exhibit A: The over-the-top melodramatic attitude.
- Exhibit B: The way he stands and walks, which is very prominent in the "World's Greatest Criminal Mind" part.
- Exhibit C: The hankies that he carries in his cape.
- And let's not forget the way he talks to Felicia. He also seems to enjoy messing with Basil a little too much.
- Arch-Enemy: To Basil.
- Ax-Crazy: Towards the climax, when he's enraged. Not that he was particularly sane to begin with.
- Bad Boss: He's generally affable towards his minions, but when one of his flunkies gets drunk and calls him a rat, he promptly feeds said minion to the cat, and threatens to do the same to his other minions unless they continue with his Villain Song.
- Badass Cape: As you can see on his image.
- Berserk Button: He despises being called a rat, even though he technically is one.
- Big Bad: He's based off of Professor Moriarty, after all.
- Boomerang Bigot: He hates rats despite being one himself and tries to pass for a "big mouse."
- Bond Villain Stupidity: Justified. He explains that he did plan on staying and watching as his latest Death Trap did its work, but since Basil and co. showed up 15 minutes later than he planned, he doesn't have time to stay, and so he rigs a camera to capture Basil's dying moment instead.
- Burn the Orphanage: "Worse than the widows and orphans you drowned?"
- Cape Snag: Basil invokes this on Ratigan towards the climax.
- Captain Ersatz: Professor Moriarty.
- Card-Carrying Villain: Interestingly enough, his minions enjoy working for him because of this. And of course, he's also voiced by Vincent Price.
- Child Hater: He's drowned an unspecified number of orphans, planned to eliminate orphans after becoming a king, and he's not nice towards Olivia. At all.
- Complexity Addiction: He couldn't decide on a single way to kill Basil, so he opted instead to make a Rube Goldberg Device that used deadly instruments like a mousetrap, a gun, a crossbow, an axe, and an anvil all at the same time.
- Diabolical Mastermind: Defined by Basil as the "Napoleon of crime" (an obvious reference to Professor James Moriarty).
- Disney Villain Death: His Karmic Death.
- The Dreaded: Ratigan is the most hated being in the Mousedom, because he's such a vile, cruel monster, and once he comes out in front of the other citizens, he's met with contempt and disgust immediately. However, he's well aware everyone hates him, so by replacing the queen and have her grant him full control, his subjects won't have any choice but to serve him or die.
- Evil Brit: Albeit with the American voice of Vincent Price.
- Evil Counterpart: To Basil.
- Evil Feels Good: Ratigan says that aloud quite a few times.
- Evil Genius: As to be expected due to being Basil's archenemy.
- Evil Is Bigger: Far larger than anyone else in the cast. This is because he is a rat.
- Evil Is Hammy: Look at who voiced him. It's inevitable.
- Expy: Ratigan is the Evil Counterpart to Basil, just as Moriarty is to Holmes.
- Fangs Are Evil: He has a mouth full of noticeably jagged and yellowed teeth.
- Faux Affably Evil: He comes off as rather cheerful and pleasant, especially when compared to Basil (who can be a bit of a smug Jerk Ass). However, he's also an evil criminal genius who's perfectly willing to threaten a child in order to get what he wants.
- For the Evulz: He loves being a cruel, rotten villain, and often boasts about it.
- Genius Bruiser: He's an evil genius...but is also strong enough to lift up Hiram with one finger and trounce Basil in a one-on-one fight.
- Good Smoking, Evil Smoking: Ratigan smokes a cigarette (complete with long stemmed filter), while his Arch-Enemy Basil smokes a pipe.
- I Am Not Weasel: He HATES being called a rat.
- Insistent Terminology: He's a "big mouse." Which, amusingly enough, was what he was in the books.
- Karmic Death: Just as Ratigan used a handheld bell to execute his incompetent followers, he dies when the bell from the clock tower goes off.
- Kick the Dog: When he breaks the toy Hiram made for Olivia. And later kicks Olivia herself.
- The Kingslayer: Attempted regicide on Queen Mousetoria to take over the Mouse World equivalent of the British Empire.
- Large and in Charge: He's significantly larger than his mooks.
- Large Ham: He's voiced by Vincent Price, and is actually even hammier than most of his other characters. Also probably the hammiest of all Disney characters.
- Last Name Basis : He's only known as Ratigan, the original book series reveals that his first name is Padraic.
- Laughably Evil: It also helps that he's voiced by a man who plays laughably evil characters.
- A Lizard Named "Liz": Despite what he claims, he is a rat named Ratigan.
- Narcissist: Perhaps one of the best examples in Disney canon, down the over-the-top melodramatics.
- Near Villain Victory: Basil may have foiled Ratigan's plans, but Ratigan very nearly puts down the determined detective in a No-Holds-Barred Beatdown atop Big Ben. Ratigan surely would've triumphed if not for a stroke of dumb luck on Basil's part.
- Nice Hat: Like Basil, he wears a hat, although in his case he wears a top hat.
- No-Holds-Barred Beatdown: Towards the end of the movie, Ratigan mercilessly attacks Basil while shouting "There's no escape this time, Basil!" That Ratigan is usually more friendly than that only makes his suddenly vicious attack feel even more intense. Memorable enough to provide the page image for a while.
- Offstage Villainy: "From the brain that brought you the Big Ben Caper ... and wondrous things like the Tower Bridge Job..." And the widows and orphans he drowned.
- One-Winged Angel: In the ending, he reverts to his monstrous feral rat form and comes within a hair's breadth of killing Basil.
- Out-Gambitted: "Poor Basil — oh, he is in for a little surprise..."
- Perma-Stubble: Although technically speaking it's just the fur color.
- Polite Villains, Rude Heroes: Despite being a vicious Diabolical Mastermind who is perfectly willing to threaten children to get his way, Ratigan puts up an act of being a cheerful, pleasant gentleman, in stark contrast to his nemesis Basil, who has No Social Skills and often comes across as a rude, smug Jerkass.
- Punny Name: Ratigan.
- Right-Hand Cat: Felicia, who he interestingly seems to care about.
- Shame If Something Happened: He uses this to threaten Flaversham's daughter Olivia if Flaversham doesn't help him with his evil scheme.Professor Ratigan: (activating Olivia's wind-up ballerina doll and watching it dance) I would spend many a sleepless night if anything were to befall her. (proceeds to pick up the doll and viciously squeeze it until it breaks)
- Sissy Villain: note That is, up until his...
- Slasher Smile: Usually shows one of these. Most notably during the climax.
- The Social Darwinist: Shows shades of this, in wanting to put special taxes on "parasites and spongers".
- Stepford Smiler: Type C, being Faux Affably Evil.
- Tall, Dark, and Snarky: Unlike Basil, he's never deadpan.
- There Is No Kill Like Overkill: His ridiculously over-the-top Death Trap for Basil, which is set up so the detective will be snapped by a mousetrap, shot by a gun, impaled by a crossbow, chopped in half by an ax, crushed by an anvil, and get his picture taken. As he explains, he had trouble deciding just what idea he would use on Basil... so he went for all of them.
- Tranquil Fury: Throughout most of the movie, Ratigan repeatedly gets angry, but manages to reign it in and remain Faux Affably Evil as he threatens and murders his henchmen.
- The Unfettered: Outright called as such by Basil:Basil: There's no evil scheme he wouldn't concoct! No depravity he wouldn't commit!
- Unstoppable Rage: During the climax, he goes completely berserk, pursuing and attacking Basil with unprecedented savagery while ranting crazily.
- Villain Song:
- "Oh, Ratigan! To Ratigan! The world's greatest criminal mind!"
- Also, "Goodbye So Soon"
- Villainous Breakdown: Ratigan, towards the final battle, turns from a formal and composed rat into a hulking and monstrous one. It's even the trope's picture on the film page! Made even more frightening is the fact he was previously so Faux Affably Evil. It serves to show just how insane and feral his breakdown has left him, especially since he had, up to now, succeeded in keeping Olivia and her father separated from each other. When he sees Basil successfully reuniting them before his very eyes, and thus depriving him of what little victory he had had left, this accelerates Ratigan's breakdown.
- Wicked Cultured: Formal, well-dressed, charismatic, with a genius IQ. He pretty much personifies Evil Is Cool.
- Would Hurt a Child: He has Olivia kidnapped and threatens to kill her in order to make her father cooperate, and during the climax of the film, he kicks her into Big Ben's gears to be crushed. Basil saves her Just in Time.
- You Are What You Hate: "I am not a rat!"
Fidget the Bat
Voiced by: Candy CandidoRatigan's bumbling bat henchman. He tends to do the dirty work for his boss. He has a crippled wing and a peg leg, and, as a result, he cannot fly.
- Adorable Evil Minion: Beside his violent evil nature, Disney meant for him to be both loveable and scary.
- Bag of Kidnapping: Does this to Olivia.
- Bat Out of Hell: He's a bat, and he's one of Ratigan's henchmen. He has some genuinely scary moments, like the Nightmare Face he makes when he breaks into Hiram's workshop and kidnaps him.
- Beware the Silly Ones: The first scene in the movie speaks for itself. Fidget might provide most of the films comic relief, but he can be downright brutal when he wants to be.
- Bumbling Sidekick: Subverted quite brutally. He can be a bit clumsy when off-duty and he does provide a few good bits of humor, but is very competent and can be downright terrifying when he needs to be.
- Butt-Monkey: Ratigan has a tendency to treat Fidget this way.
- Distracted by the Sexy: Gets his pegleg stuck in a floorboard when he's too busy watching Miss Kitty's burlesque act.
- The Dragon: He's Ratigan's right-hand-bat.
- Evil Cripple: A peg-leg and a crippled wing so he can't fly, and a rather nasty character to boot.
- Evil Sounds Raspy: A rather extreme example.
- Handicapped Badass: He has a peg leg, and a "broken" (mishealed? misshaped?) wing. Yet, he is a competent fighter.
- Hidden Depths: Despite his faults, Fidget had been shown various times to be quite competent. There's also the start of the movie...
- Indy Ploy: The chase scene with Basil in the toy store demonstrates this quite well. Fidget really knows how to think on his feet(even if he only has one foot).
- Not-So-Harmless Villain: Don't be fooled by his occasional bumbling and physical limits, he's far from harmless. The scene where he brutally beats up and kidnaps Hiram best demonstrates just how frighting and dangerous Fidget really is.
- Scary Teeth: Which he uses occasionally during his ambushes.
- Shadow Discretion Shot: The scene of Fidget and Hiram's fight was so brutal, that Disney made it censored by shadows. It can be also noted that Hiram's toyshop was left in chaos after the fight.
- Violence Is Disturbing: In the scene where Fidget kidnaps Hiram. Along with the climactic fight between Basil and Ratigan, this is one of the most brutal and frightening scenes of the whole movie.
- Would Hurt a Child: Perfectly willing to throw Olivia out of Ratigan's blimp to "lighten the load". It didn't work out as he had hoped.
- You Have Failed Me: When he tires from pedaling the blimp's propellor, he suggests lightening the blimp, Ratigan does so... by throwing him off of it.
Voiced by: Frank WelkerRatigan's massive and pompous pet cat. Ratigan calls upon her by ringing a special bell to dispose of traitors or anyone who makes him angry.
- The Brute: Like Toby, she towers over the other characters. She solves her problems by simply eating her enemies.
- Cats Are Mean: She's Ratigan's pet.
- Exit, Pursued by a Bear: The last time we see her, she jumps over a high wall to be attacked by some royal Angry Guard Dogs.
- Fat Cat: Even though she looks bigger anyway because the rest of the characters are mice, she's still obese.
- Female Feline, Male Mutt: Female Feline to Toby's Male Mutt, although they are enemies.
- Fluffy the Terrible: A giant house cat that Ratigan flowers with affection and uses to dispatch his enemies as well as any incompetent lackey.
- Laser-Guided Karma: Felicia escapes Toby by jumping over a high wall, only to be torn apart by the royal hounds on the other side. A fitting punishment for attempted regicide.
- Right-Hand Cat: To Ratigan. Oddly, she's also a Right-Hand Attack Dog, though obviously not in the literal sense.
Voiced by: Melissa ManchesterA female dancer/showgirl mouse who briefly appears in the movie.
- All There in the Script: Miss Kitty's name isn't brought up anywhere in the film, but it can be seen on her character model sheet. Although it isn't likely to be her actual name, but a descriptor.
- The Chanteuse: During the bar scene.
- Chorus Girls: Miss Kitty's musical number also has two backup dancers that dance alongside her. They are her twin-sisters, each with a Beauty Mark.
- Hello, Nurse!: When Miss Kitty start to strip, in her musical number, only Basil pays no attention while patrons grab fruitlessly at her.
- Ms. Fanservice: Her only appearance in the film is her putting on a burlesque performance while stripping from a dress to a showgirl outfit, earning quite a bit of cheers from the bar patrons.
- Parent Service: Her role in the movie.
- She's Got Legs: She has some of the most shapely, curvaceous legs ever animated.
- True Blue Femininity: Her showgirl outfit, as seen in the picture above. Her backup dancers wear pink though.