A Stock Phrase often directed towards a Big Bad or other particularly evil character. If a character is saying this, it's a good indication that whoever the statement is directed towards has either crossed the Moral Event Horizon in the character's eyes or just so happened to press their Berserk Button. Variations exist (such as "You're a monster" or "You're rotten to the core!").
See You're Insane! for when a character is calling another crazy rather than evil. This can also lead to an Insult Backfire if a particularly wicked villain takes pride in this label.
This trope can also be used to point out how powerful the character is. Characters who possess that much power are considered monsters by others because of their immense power. Similarly, it can be used in a show of amazement when somebody does something that incredible.
In dramatic situations, this carries the same weight as the Japanese This Is Unforgivable!. Unrelated to You Bastard, but there may be overlap if the work's being fairly Anvilicious.
This often shows up in What Measure Is a Non-Human? scenarios, often targeted at a character who either is or is trying to be human.
Compare Complete Monster, in which the audience feels that the character is irredeemable. Contrast with You Rebel Scum!, where the general populace in-story has been convinced that the protagonists are evil. See also I Am a Monster when they consider themselves to be evil or inhuman.
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Anime and Manga
Black Lagoon. Janet Bhai is running away from gangsters, while Sister Eda is driving next to her in a car.
Sister Eda: Do you want us to save you? Think hard. If you don't want to hand over the plates, I guess we don't have a choice. You'd better run to a mosque next time. What do you think? [snip]
Janet Bhai: 30,000 dollars!
Sister Eda: Rock, it's almost my bedtime. I'm going back to the church.
Janet Bhai: You monster! 100,000!
In the TV series of Hellsing, there's this exchange:
Alexander Anderson: You monster.
Alucard: I get that a lot.
Also happens quite a lot in Hellsing Ultimate.
Alucard: Come on, get up! Attack me! You've only suffered the loss of your legs. Summon up your familiars, transform your body, heal your severed legs and stand! The evening is still so young. Come on! Hurry, Hurry! HURRY!!! Pull yourself together, the fun has just begun. Come on, HURRY! Luke Valentine: MONSTER!!!
SWAT member: No! You're a monster! Alucard: Yes, people keep telling me that. And what does that make you who would stand against me, Soldier? A man? A dog? A monster?
Magical Girl Lyrical Nanoha A's In the second season, it's the "villains" who refer to the eponymous heroine as a demon (after she shrugs off enough magical punishment to kill a lesser being 20 times over, no less). Her reaction? See that page's opening quote.
In the third season StrikerS, Dieci wonders if Nanoha is human after being quickly defeated and seeing the amount of power Nanoha had at the start of the battle — ironic, seeing how she is one of the few mages of her level who actually are.
Signum also comments "Good grief, you monster. I thought I was going to die back there." to Nanoha in the last chapter of the StrikerS manga after their mock battle concludes in a draw. Kind of hypocritical of her, as she probably came closer to killing Nanoha with her fiery explosions.
The real Kaiba said it to Pegasus several episodes later, however. (Of course, given what Pegasus had done to Mokuba, this was not a time to make jokes.)
Dragon Ball Z: Possibly the most often-quoted dialogue exchange in the saga comes from the eighth movie, Broly: The Legendary Super Saiyan, though it is more of a variation, wherein Broly verbally upgrades himself. To recap, the titular villain is completely curbstomping the heroes and has just roughed up Gohan, when Piccolo shows up. The dialogue is usually translated along these lines:
Broly: So, another little bug has come to die!
Piccolo: Hmph. Do as you like, you monster.
Broly: A monster? No, you're wrong, I'm THE DEVIL!
Dragon Ball Kai has Goku say this after Krillin's death and Frieza's subsequent threat:
Kirby of the Stars: "Anyone who abandons his reason, and lives only by hatred, is a monster!" Interestingly, in the Japanese version, the term "Demon Beast" (which was replaced by "monster" in the dub) is used to describe someone who is consumed by hatred. And, in fact, anyone who has been so not only is considered a monster, it's also possible for that someone to turn into one.
Vash the Stampede gets this periodically, even for just his skills and reputation. When things about his...special body come out this trope gets cranked up, such as the shooting-a-hole-in-the-moon thing. The single saddest example is when he saves a town in the Maximum manga shortly after being forcibly introduced to just how flexible he is, and winds up reflexively catching a bullet with a 'feather' from his arm. The townspeople stone him.
Attack on Titan provides a very interesting (and complicated) example when Eren confronts Reiner and Bertolt concerning their crimes. As enemy agents, they've been responsible for the majority of death and destruction in the series, by destroying the Walls and providing information for Annie's attack on the 57th Expedition. Ironically, Eren's rant specifically condemns them for expressing remorse over their actions, calling them inhuman monsters that have no right to even feel guilt after learning that Reiner's crushing guilt over his actions has caused him to begin blocking out his true memories in order to continue functioning. Ymir immediately calls Eren out as well, making it clear that his overly-simple worldview makes him unreliable and unable to grasp the bigger picture. Considering one of the major themes of the series is He Who Fights Monsters, accusations about exactly who is a monster are common and rarely simple.
Gaston: Belle, if I didn't know any better, I'd say you had feelings for this monster. Belle: He's no monster, Gaston. You are!
In Kung Fu Panda 2, Mantis states this in amazement as Po manages to fit a whopping forty dumplings in his mouth and set a new record.
An indirect version in The Hunchback of Notre Dame. In the opening song, narrator Clopin asks "Now here is a riddle to guess if you can: Who is the monster and who is the man?" Frollo does call baby Quasimodo a monster when he sees that the child is misformed, and tries to kill him for it. You can probably figure out on your own to which character the riddle alludes.
Terry McGinnis: It's funny, I know about all your other major enemies but you never mentioned him. He was the biggest, wasn't he? Bruce Wayne: It wasn't a popularity contest. He was a psychopath, a monster.
Mrs. Gloop calls Wonka a "terrible man" after her son, Augustus, is sent through the chocolate river's pipes to the fudge room. In the source novel she says "You monster!" instead, specifically because Wonka finds the whole situation funny and is laughing hysterically.
In Die Hard with a Vengeance, Simon actively attempts to avoid this trope when he reveals he lied about planting a bomb in a school.
The Ghost Rider movie inverts this when the titular character, Johnny Blaze, After putting an end to Legion by using the penance stare on every single soul he absorbed, refers to himself as a monster when his love interest approaches him, feeling that he is absolutely unworthy of her love due to feeling shame about the form he has to take on.
Dark Blue. After Perry's partner Bobby is gunned down on the streets due to Perry's corrupting influence, Beth calls him out on his actions and blames him for Bobby's death. It's capped off with this declaration:
Beth: I hope that you burn in hell, Eldon Perry, you evil motherfucker.
In Return to Cabin by the Lake, a mob of protestors call the (presumed dead) serial killer Stanley a twisted monster. Near the end the heroine, after earlier attempts to understand the mind of the killer, notes that he's simply an evil bastard who doesn't deserve to live.
Subverted in The Avengers. Loki tells Natasha Romanov in detail what he intends to do to her, bringing her to tears.
Geryon: What gave it away? Was it the three chests?
In The Stand, Whitney Horgan protests the impending crucifixion of Larry Underwood and Ralph Bretner, having finally had enough of Flagg's evil. As Flagg prepares to kill Whitney with demonic lightning, Whitney tells him to his face that Flagg isn't a man at all but some kind of devil. Flagg agrees, then fries Whitney.
In the Graveyard Book Scarlett calls Bod a monster after he saves her from one of the Jacks.
The Twilight Zone: In the 2003 revival, Anthony's own mother calls him a monster after all the years she had to suffer under her son's godlike powers.
Doctor Who: "The End of Time" — Wilfred Mott to the Master after he turns the entire human race into doppelgangers of himself.
Supernatural: In 5.22 "Swan Song", Michael has this retort to Lucifer when his younger brother tries to persuade him to join him one last time.
Michael: You are a monster, Lucifer. And I have to kill you.
Babylon 5: For most of seasons three and four, Earth President Clark had been committing various atrocities against various Earth colonies, but one particularly vile act has Commander Ivanova burst into Captain Sheridan's quarters with these words: Bastards! Those cold-hearted rat BASTARDS! The outburst is caused by receiving news that two EarthForce destroyers jump out of hyperspace and, completely unprovoked, destroy five commercial liners packed with 10,000 civilian refugees. When Sheridan lets it sink in, he assumes the same mood if not the same words. He sums up his sentiment in a terse log entry seen in the beginning of the next episode.
In the insert Monsterpiece Theaatre: Twelve Angry Men. Alistair Cookie tried to run "12 Angry Men", But ran "3 Sad Cows" and "2 Proud Pigs", And ran out of time, The 12 Angry men arrived on the studio. And scolded to Alistair Cookie about it. And one said: "You are going to hear from my agent."
Leela and Elmo got angry with Oscar as he was about to eat his anchovy sundae Ice Cream to celebrate that nobody on Sesame Street were sharing. Leela went like "You are a grouchy monster, That's who you are! You need to tell us the cure for Mine-Itis!" And Oscar went "Oh yeah?!? And why would want me to do silly thing like that?" And Elmo said "Because, Nobody on Sesame Street is sharing!"
Jon Snow calls Craster a monster to Commander Mormont, for marrying his daughters and daughters/granddaughters, and because he sacrifices all his baby sons to the White Walkers. Mormont agrees with him, but states that they have other fights to worry about.
Cersei opens a conversation with Tyrion with "You monster!" because he is sending her daughter Myrcella away to Dorne.
Joffrey is casually called a monster by Loras in Season 1. In Season 3, Sansa admits that Joffrey is a monster to Olenna and Margaery Tyrell after significant prodding.
Joffrey has the gall to refer to Tyrion as "You little monster" during one of his rants. Tyrion snarks back nonchalantly.
However the trope is inverted in "Mockingbird". Prince Oberyn tells Tyrion how he and his sister went to see the 'monster' that had been born to Lord Tywin. "That's not a monster, that's just a baby."
This is a prominent theme in Dexter. The Serial Killer protagonist Dexter Morgan directs this at himself, considering himself a monster because he's compelled to murder. He has managed to cope all this time by only killing other killers. He claims that what sets him apart from them is that he is aware of this fact (which they are not), and the code he lives by. He calls them "unchecked versions of myself" and often refers to them as monsters as well.
Dexter: [to George King aka "The Skinner"] Oh I have my excuses and justifications, but really I just... need to. Like you. You have your excuses, finding Freebo, getting your money. But you know he's dead. You know there's no money, so really you're just... a killer. A monster. The stuff of nightmares.
Dexter: [to Arthur Mitchell aka "The Trinity Killer"] You were a very special kind of monster. You destroyed your own family.
The TV's Kyle song "Snowman" is about a snowman who is upset with the existence of such beings. The song ends with a whispered "You monster" directed at the snowman's maker.
One of the verse in the song "Mr. Grinch" from the Cartoon Animated TV adaption of Dr. Suees' How the Grinch Stole Christmas! went "You're a monster, Mr. Grinch".
The Witcher: The Big Bad accidentally does this to himself. In response to Geralt preparing to kill him with his silver, beast-killing sword (having been disarmed of his steel human fighting one), he utters "That sword is for monsters!" Geralt's response is pretty much a silent "Yeah, I'll let you puzzle it out Sherlock", as he stabs him through the chest.
Much eariler in the game, Geralt has this little gem
"Witchers are known to carry two blades. A silver blade for monsters and steel for humans." "Both are for monsters."
Which is actually a literal truth; the steel swords utilized by Witchers are made from meteorite ore, and certain monsters are as susceptible to that as other monsters are to silver.
Dragon Ball Z Raging Blast - Goku to Frieza in story mode, once he snaps and starts going SSJ.
"I won't let you get away with that, you...you monster!"
Crisis Core: Sephiroth, Angeal, and Genesis are all described by themselves and others as monsters. Sephiroth is the only one of the three who truly fits this trope. Interestingly enough, Sephiroth tends to call Cloud and Zack traitors in such a venomous tone as to suggest that he's the bad guy.
Cloud: I've got some things...to settle with you. Sephiroth: You ignorant traitor!
Grolla: Michael Zeppelin! Sepperin: ...Grolla. Such a rude entrance... how ludicrously fitting for a traitor. Grolla: Silence, demon! Know that the price for toying with the souls of the dead is high!
She calls him such a thing again when she asks him for any last words after she defeats him, just before Iris comes and obliterates him into a burst of flames.
Grolla: Any last words, Devil?
Also, during the beginning scene way earlier in said mode, after Iris attacks Grolla with her immensely powerful magic, Grolla begins to fear her from her attack and wonders what in the world she is (probably suggesting that she's describing her as a monster.)
Grolla: What in the...!? How did she obtain such powerful magic? Iris, what are you?
Caellach: Hmm... You waste your last breath on insults, and feeble ones at that. Die then, fool of Frelia.
Final Fantasy VI: Kefka is referred to as such in the Advance remake. Well, sort of. The exact words are "You're Inhuman" when Shadow and Sabin reveal themselves to Kefka shortly after Kefka demands to get the poison ready so he could proceed to dump it into Doma's water supply, the message is still just as clear.
In Final Fantasy VIII, Squall tells Seifer that he's just another enemy to the party, like one of the monsters that they regularly encounter. Seifer replies that the party is the monsters for attacking in a swarm like they do and begins the battle with "Let's go after them monsters!"
This is Thrask's reaction if you blackmail him with proof his recently-dead daughter was a secret mage.
One of Merrill's own clan calls her a monster after her mentor dies at the end of her Act 3 quest.
The first diplomatic dialogue option when confronting Meredith before the Final BossBattle in the mage campaign of The Last Straw is "You're a monster".
Being dismissive of the destruction of Taris in Knights of the Old Republic to Juhami will cause her to flip out at you, calling you "a beast". She has a similar but even more scary reaction to a vile man looking for cathar slaves.
In The Reconstruction, this is Dehl's response to learning that Havan tortured Donz to death.
In Dark Souls, Eingyi will call you a monster if you kill his mistress the Daughter of Chaos. Since she's one of the most kind-hearted and sympathetic characters in the game and is totally defenseless and non-hostile, it's hard to disagree.
In Legacy of Kain, Kain gets called this by Vorador after he kills Umah in cold blood. Kain responds (possibly correctly) that Vorador would have done the same in his place, but the incident is still shocking because it was starting to look as if Kain might have found a Morality Pet.
Bishop Doplin of Legaia II: Duel Saga gets called "garbage" and a "truly evil person". After you defeat Elliot and Marienne for the final time, the party confronts Doplin in order to obtain the Pyrolith. After he learns the duo is dead, he remarks that he never cared about them, and was just using them for their power. The party goes ballistic on hearing this, and call him out for it.
Maya: I used to think that there was no such thing as a truly evil person. but... I guess I was wrong.
Kazan: I've never met anyone as rotten to the core... This is not a man, he's garbage.
Tsukihime: near the end of Arcueid's route, Roa says this to Shiki after he shows him how to kill things.
Star Wars: The Old Republic: You'll hear a lot of this when you choose dark side options. And the whole Sith Warrior storyline is essentially written for these moments.
Inverted hilariously fairly early on in the Sith Warrior storyline: the player has been sent by their new master to ensure that a shipment of goods that are delivered safely. Naturally two teams of enemies show up and in the ensuing conversation, the player eventually comes to the option where they can a) Convince the opponents to attack each other and wipe themselves out, b) Attack them both at once, or c) chose the option entitled simply "I'm a monster." Choosing this gives you a scene with your Sith Warrior ranting about how he is going to slaughter and eat them involving such gems as threatening to drink their marrow, which causes the enemies to flee in terror.
Shi-Long Lang to Quercus Alba in the final case of Ace Attorney Investigations: Miles Edgeworth, after uncovering his crimes, including a serious blow to Lang's home country's economy through the use of counterfeit currency:
Green Link: What have you done with Princess Zelda? Dark Link: Heheh... What haven't I done with Princess Zelda? Green Link: You monster! Blue Link: You fiend! Red Link: You lucky bastard! Uh...I, uh, mean, how could you.
Another humerous example was in the OneyG YouTube Video Dragonzball PeePee was after Goku (Kaka Carrot Cake) arrived on the scene, and Vegeta (Virginia) starting talking about how evil Frieza (Freezie Pop) really was.
Abraham: You don't understand. I'm here about a monster.
Raven: There are many unusual beings in this school, but none among them are monsters. Except, perhaps, the man who now stands before me.
Kevin & Kell: While Rudy and Wendell are delivering Easter Eggs they find find that the quality control isn't what it should be and some are hatching. Rudy decides to eat the chick leading to Wendell cry this out.
Burns: Oh, those wheels are squeaking a bit. Perhaps I could sell him a little oil. Bart: You twisted old MONSTER! [Bart runs at Burns, as if about to attack him, until he sees that Burns brought a gun] Burns: I have decided to protect myself ever since I was attacked in my office by an unidentified assailant. Homer [from the crowd]: D'oh!
In "Hurricane Neddy", Flanders delivers epic The Reason You Suck speeches to some of Springfield's residents before turning to Homer and saying chillingly "Homer, you are the worst human being I've ever met". Homer thinks he got off lightly.
Blaineley, in Total Drama World Tour. When Geoff calls her a monster, she dismissively replies, "Meh. Been called worse."
Darkwing Duck: Towards the end of the pilot, Gosalyn (not yet his daughter) is held hostage and essentially tossed off the top of Saint Canard's tallest building, rescued when Darkwing gives the Big Bad what he wants. In exchange, Taurus Bulba declares that Gosalyn has outlived her usefulness, has her raised even higher, and drops her. Darkwing's answer? 'You butcher!', a cheap shot, and Bulba being worried for the first time in his criminal career.
A flashback on X-Men: Evolution showed a castle, Mystique's voice screaming "Monster! What have you done to him?" and Mystique running out of the castle with an infant Nightcrawler in her arms with Magneto in pursuit. It's hinted that Magneto is somehow responsible for Kurt's fuzzy blue appearance. Or maybe he just circumcised him.
In Teenage Mutant Ninja Turtles: Fast Forward, Leonardo, while going to stop Baxter Stockman from transplanting Bishop's brain into himself, explains the true meaning of being a monster as well as the differences between a monster and a man, and asks him whether he was either one and whether he would like to use his power to create or destroy.
Leonardo: (about Bishop) He owed a lot of people, Baxter. But he's been paying it back by changing the world. Bishop's work is actually united people of all races, earthlings or otherwise. I mean, we can walk the streets in daylight... because in Bishop's world, no one's considered a monster based on how they look, only by how they act. Are you a monster or a man? Do you wanna use your skills to destroy? Or like Bishop, can you see a way to create something?
The Phineas and Ferb episode "The Beak" has this, after the villain drops water on the people of Danville:
Spongebob Squarepants says this in Patrick's imagination in "Donut of Shame" when Spongebob steps on the donut Patrick stole from him.
Spongebob: Donut! (Yelling to Patrick while the donut's remnants are in his hands) You Monster!
American Dad!: Steve calls Stan this after Roger appears to die and Stan callously asks Steve to burn all evidence of Roger's existence. Stan sadly refutes this after Steve leaves, only for a human skull to drop out of the furnace, which he kicks back in.
Twilight Sparkle to the fake Cadence in the second part of "A Canterlot Wedding" on My Little Pony: Friendship Is Magic. "Don't you dare do anything to my brother, you, you monster!"
Avatar The Last Airbender: In the episode "Jet", when Katara finds out that Jet is fully willing to blow up a dam and wipe out an entire Earth Kingdom village just to take a few Fire Nation soldiers with it, she says, "You're a monster, Jet."
In the first My Little Pony special, Megan yells "You're a monster, do you hear me?! A MONSTER!" at Scorpan after his second raid on Dream Valley.
Leonard Pitts Jr. of the Miami Herald, in his famous column "We'll Go Forward From This Moment" written the day after September 11th, 2001, calls out the unknown author of the tragedy of the World Trade Center and the Pentagon with these words: "You monster. You beast. You unspeakable bastard."