7eventy 5ive: The killer in is both crazy and uses an axe to kill people.
Alien³: Walter Golic is by far the craziest convict. Even though he didn't kill the two inmates that the others suspect him of having murdered (the Alien did it), he is still a homicidal nutcase. When he's contained in the infirmary in a straight jacket, he turns to Ripley and suddenly reminisces about a few women he knew back home. Then he looks her in the eye and says that she's gonna die too.
The Avengers: Loki, the main villain, announces his arrival on Earth by killing a bunch of S.H.I.E.L.D. agents with the evil spear of doom that Thanos gave him. He proceeds to kill many more people over the course of the movie. In addition to his violent behavior, though, it's a sign that someone has to be particularly mentally unstable when Bruce Banner, a man with a super-powered alter ego and serious anger-managementissues, describes him by saying that his mind is a bag of cats and you can smell the crazy on him.
Barnaby: Item 1: Kidnap Tom. Roderigo: * Makes throat-slitting gesture* Gorganzolo: No, just kidnap him. Barnaby: Item 2: Throw him in the sea. Roderigo: * Repeats gesture* Gorganzolo: No, just throw him in the sea! Barnaby: Item 3: Steal the sheep. Roderigo: * Stabbing motions* Barnaby: No, just steal them!
Back To The Future Part II has Griff Tannen, Biff's grandson in 2015. Doc says he has "a few short circuits in his neural implants", and he's not lying; he's even more violent than his grandfather, has No Indoor Voice, and cranks Biff's "your shoe's untied" prank Up to Eleven, where, instead of simply smacking Marty Jr. in the chin, he punches him across the face. He also carries a retractable baseball bat with him at all times, and is all too happy to use it.
Buford Tannen in Back To The Future Part III tops both of them. He has a Hair-Trigger Temper that takes next to nothing to set off. He hates his nickname "Mad Dog" so much, he murders anyone who calls him that right on the spotnote Marty was lucky - he's forced into Bullet Dancing, with Buford only ready to kill him after Marty dunked a spittoon on his shirt.. His kills include 12 unnamed men (not including Indians or Chinamen), Doc Brown in an alternate past over $80, and a newspaper editor who "printed an unfavorable story about him" (or a story that Buford found unfavorable, anyways) in 1884. They just stopped keeping track of his kills at that point. He's also a borderline sadist, taking glee in attempting to hang Marty and telling Doc how it'll take 2 whole days for him to die a slow, painful death from a Dellinger gunshot (thankfully, both of them are saved by the other).
Bad Boys: Fouchet's plan seemed to involve killing everyone he encountered. His first reaction when the cops arrive at the end? Shoot his partner.
Mr. Zsasz from Batman Begins. Though he's pretty quiet during his small amount of screen time, the tie-in video game displays him as very much so. It is hinted in the movie as well, since he has some of the tally mark scars he cuts on himself every time he kills someone in the comics. Also, he comes at Rachel and a young boy with a knife in the Narrows when the Narrows are flooded with fear gas.
Joker: "Guns are too quick. You can't savor all the... little emotions. In... you see, in their last moments, people show you who they really are. So in a way, I know your friends better than you ever did. Would you like to know which of them were cowards?"
Battle Royale: Kazuo Kiriyama shoots down several unarmed girls, grabs their megaphone and puts it to one girl's mouth so everyone within hearing distance can hear the sounds she makes as she dies.
Caligula: The title charcter. Tiberius also gets a couple of moments.
Tiberius: Do you think this boy has drunk enough wine?
Caligula: I think he's drunk enough, Lord.
Tiberius: So do I! *kills drunk man* Now he is happy.
Cloud Atlas: Bill Smoke, Henry Goose, Dermot Hoggins, and the entire Kona tribe.
In Kathryn Bigelow's Blue Steel, Eugene Hunt is a stockbroker and by all outward appearances a normal person but who under the cover of night goes on a killing rampage after he acquires a .44 Magnum from a robber whom the protagonist, rookie cop Megan Turner, shoots early in the film. By the final act of the film he has gone completely ballistic and shoots and kills Megan's friend and later sneaks into her house, strips himself completely naked and brutally rapes her shortly after she has consensual sex with a fellow officer.
Blue Velvet: Frank Booth is one of the most memorably profane and sadistic psychopaths ever put to film. He will murder, mutilate or batter at the slightest provocation. Merely being in the same room as him is a hazard in itself.
Body Bags: The killer in the first segment is an escaped mental patient who slaughters people because he's either insane or just enjoys murder. Or both.
Cape Fear: Max Cady (especially De Niro's version) from both versions. He's a serial rapist who will stop at nothing to make the life of the lawyer who failed to prevent him from doing time a living hell.
Casino: Nicky Santoro might count, despite being an Anti-Villain. Despite having clear restraints, he is still willing to violently beat and torture people if it's needed or he's angered. Though he's based on a real life gangster.
A Clockwork Orange: Alex DeLarge, an extremely intelligent but absolutely devoid of conscience psychopath, who lives only to commit random acts of, as he calls it, "ultra-violence".
Cemetery Man. When the Grim Reaper tells you to kill people, you kill people.
Crimson Peak: Lucille Sharpe killed one of her parents with a cleaver, and one of them with poison, when she was just a teenager. They were horrifically abusive parents, though, so she was sent to an asylum instead of prosecuted for the crimes. However, it's implied that the asylum just made her worse. When she gets out, she becomes a multiple murderer, killing her brother's wives and their remaining family in order to make off with their fortunes. After she kills her brother for falling in love with someone else, though, she loses the last hold on her sanity, and keeps screaming at the main character that she won't stop until one of them is dead while rushing her with a cleaver.
Dawn of the Dead (1978): Wooley just runs around the apartment building in the beginning of the movie shooting everybody in sight, whether they were zombified or not. He was so out of control, the SWAT had no choice but to kill him.
The Sandman is a psychotic serial killer who murdered people for fun. Near the climax, he releases all the prisoners from their cells to watch them cause mayhem.
The two cons who worked together with the warden to kill prisoners and silence anyone who might expose seem to be in it more out of sadism than any profit.
Demolition Man: Simon Phoenix, who can be described as Heath Ledger's Joker as played by Wesley Snipes. In fact, he's so hell bent on murder and mayhem, that it's the main reason John Spartan detects something fishy is going on with Dr. Cocteau, since Phoenix hesitates to kill him, when he never, neverhesitates to kill.
The Descent: Sarah turns into this over the course of the movie. Differs from many examples in that it wasn't a random attack so much as the Ax Crazy making her act on her motivations. Alternately, the movie purposely left open the possibility that she had imagined the creatures and it was really just her slaughtering all her friends. Which would make her much more Ax Crazy, and throughout the whole movie. Only in the Revised Ending, though. In the original ending, there's an additional scene which shows her about to be killed by the very-much-not-imaginary creatures while hallucinating that she's back with her dead daughter.
The Devil's Candy: Murderous lunatic Ray, who says Satan is telling him to kill children, because the are the devil's...
Devil In The Flesh: Debbie is a Yandere who kills numerous people and tries to kill her teacher's wife (she has an intense crush on her teacher).
Dirty Harry: The Scorpio Killer fits this trope in spades. He's a sadistic Serial Killer who kills his victims at random. He goes so far as to bury a young girl alive and threatens to let her die unless he can talk to Harry. When he meets Harry, he says he's decided to let the girl die anyway and tries to kill Harry.
A Fistful of Dollars: Ramon Rojo is extremely obsessed with a woman, is widely paranoid, and tortures and kills in cold blood. He is a dangerous psychopath and makes a Slasher Smile during many of their massacres.
For a Few Dollars More: El Indio is even more unstable than Ramon, Indio is a full-blow insane man, especially when he smokes (presumably) marijuana.
Dredd: Ma-Ma is a little more subdued than others but her first act in the film is to order three rival dealers skinned alive and thrown off a 200-foot balcony, after giving them a hit of Slo-Mo to slow their perception of time and drag it out even longer. It's even stated that she has an M.O. for maximum violence.
The Kodak bear in The Edge obsessively stalks Bob and Charles, brutally ripping Stephen to shreds and is determined to do the same to them, despite the fact that there must surely be other game around for him to feats on. Apparently the men getting stranded and consequently wandering into his territory really pissed him off.
Elysium: Kruger is crazy enough that he uses his goddamn katana to cook food with. What makes him one of the most batshit insane villains yet is his horrifying reputation for being a human-rights violator and for having a very bad habit of blowing people up, going as far as calling an injury that he inflicts on those who get in the way "a flesh wound", before blowing them to chunks. And once he finds out Delacourt's "classified info" was a total system reboot for Elysium, he decides to kill Delacourt and get the data himself to turn Elysium into his personal hell.
Friday the 13th: In the first installment, Pamela Voorhees goes on a murderous rampage against the consuelors of Crystal Lake Camp, holding them responsible for the death of her son Jason. Jason himself picks off where she left in the sequels.
Gamer: Hackman is a mountainous inmate who enjoys killing way, way too much. Lampshaded when Kable notes that he really isn't right in the head when Hackman comes to boast about killing another prisoner.
Gangster No 1: Gangster is not quite right in the head and his preferred weapon is a hatchet. He certainly fits the bill.
Tommy De Vito is a sadistic mobster liable to open fire at the slightest provocation, irritation, or inconvenience. He also murdered Billy Batts in an extremely brutal way. Pesci had trouble playing the role because he could not understand a character who reacted violently to everything. This was particularly true of the scene where Tommy kills Spider. From Pesci's perspective (or any other sane person for that matter), having someone that you've been ragging on telling you to go fuck yourself was no big deal. He finally decided that Tommy would simply not be able to understand that Jimmy rewarding Spider and asking Tommy if he was going to let Spider get away with it was all meant in jest, instead choosing to see it as a insult.
Jimmy Conway is a very subtle example. We rarely ever see him lose his cool demeanor, and he comes off as a rational individual. Then the corpses of nearly everyone who participated in the Luftansa Heist start popping off everywhere.
Grosse Pointe Blank: Dan Aykroyd's character Grocer manages to come off as Affably Evil until the climactic firefight, where it becomes immediately obvious that he's batshit insane.
Halloween: Michael is somewhat of a subversion, in that he is more calm and quiet than crazy, but is still a cold-blooded homicidal maniac without conscience who is driven to kill.
Inglourious Basterds: Hugo Stiglitz is a lesser, 'heroic' example, having violently stabbed 13 Gestapo officers to death. The Basterds themselves are also this in the same vein as the aforementioned character.
In the movie Infini a bio-agent infects a search and rescue crew and turns them all violently insane, driving them to kill each other. Turns out it's trying to find out who among them is the strongest so it can evolve.
Jack the Giant Slayer: Wicke comes off as just slightly unhinged during a lot of his screen time. Whenever Roderick gives him the cue to either kill someone or that he's going to do it himself, he reacts with glee and excitement, and even when that's not happening, he's usually trembling and/or smiling eagerly about doing whatever it is they're planning to do next.
A View to a Kill: Max Zorin is really enjoying himself when he is gunning down his employees near the climax. And by the end of the film, he's completely lost all of his sanity to the point of using a literal ax to try and hack Bond to death, all while cackling like an evil and insane homicidal maniac.
GoldenEye: Xenia Onatopp is a Psycho for Hire for the Janus Syndicate who actually derives sexual pleasure from the act of killing. Her favourite murder method is asphyxiating men between her Murderous Thighs while having sex, and she practically orgasms when gunning down unarmed technicians at the Severnaya facility.
Quantum of Solace: Dominic Green becomes this towards the end when James ruins his plans and destroys his entire facility, at which point, he completely snaps and uses an actual axe to try and chop Bond into pieces, all while screaming like a complete lunatic.
L.A. Confidential: Dudley Smith is a very subdued and disturbing example. He never loses his cool demeanor, and he comes off as a rational individual. However, he's a sadistic, murderous sociopath who enjoys killing and torturing.
Last Action Hero: Ripper, a fairly generic ax-murderer, is one of the antagonists. The fact that he's a hulking, semicoherent clone of every other Ax Crazy slasher on film is surely deliberate, as he's a fictional character from a rather trite series of lowbrow action flicks.
Lord of War: Andre Baptiste Jr. is known as a cannibal, and he shoots civilians for sport. His father as well, as he callously shoots one of his own men for even looking sideways towards his woman. They're both usually more restrained, though.
Man Bites Dog: Benoit is a completely unpredictable Serial Killer. His crimes are sometimes motivated by money, but they are generally completely random. At his birthday party for example he's ecstatic about trying his presents... and shoots one of the attendees in the head without warning. He then continues enjoying the party like if nothing happened.
Matilda adds a good dose of Ax Crazy to the Trunchbull in addition to her cruel treatment of her students. The first thing she does when she suspects intruders in her house? She bull-charges from room to room, leaps down from the second floor, bringing down her chandelier in the process, and eventually starts swinging an Olympic hammer around and randomly smashing it into her possessions.
Once Upon a Time in the West: Frank is a very subtle example, since we rarely ever see him lose his cool demeanor. However, he's a sadisticPsycho for Hire with a very twisted, morbid viewpoint of his actions: He states that "people scare better when they are dying".
The Professional: Detective Norman Stansfield has the habit of murdering families while humming Beethoven, in fits of drug-induced lunacy (though it doesn't help that he is also a death obsessed psychopath). Imagine Alex Delarge if he were a cop.
The Proposition: Arthur Burns is a well read and very deep Warrior Poet...who just happens to have a penchant for gang-rape and mass murder.
Rambo: John Rambo himself has shades of it in the first movie. One time, he mistakes a kid out hunting game for one of the officers pursuing him and Rambo has to force himself to let the kid go. Col. Trautman himself lampshades this during the climax where he accuses Rambo of having wanted to initiate a fight from the beginning. And overall, he's a traumatized shell of a man, unable to feel anything in the midst of atrocities.
Red Eye: Rippner tries to kill Lisa's dad and Lisa and herself during his Villainous Breakdown following Lisa stabbing a pen through his neck.
Repo! The Genetic Opera has Luigi Largo. He's been described as walking around with a flask and a knife, drinking and stabbing anything that gets in his way, including his own employees. He's also tried to strangle his brother in 'Mark It Up'.
I'm the smartest and the toughest! I will find a hole and fuck it! If there ain't one, I will make one! Luigi don't take shit from no one!
Retroactive: Frank is unhinged and homicidal, and doesn't need much prompting to go on a destructive rampage. Discussed when Brain mentions that he thought Frank was obnoxious, but didn't expect him to be an insane psychopath.
The Rocky Horror Picture Show: Never steal Dr. Frank N Furter's spotlight while he's holding a pickaxe. It may be the last thing you do. Meat loaf, anyone? He can also be pretty intimidating with an electric carving knife.
A Room For Romeo Brass: Morrell appears to be just a lonely eccentric, but he soon reveals his true colours when he threatens a disabled boy with a knife for a harmless practical joke that made him appear foolish in front of the woman he is obsessively fixated upon, threatens to kill the boy's family, and then threatens to kill the boy's best friend (and brother of the object of his lust) when the woman rejects him. However, compared to several of the others on this list he's an unusually laughable and ultimately rather pathetic example; his attempt to make good on his threats is put in its place when the best friend's estranged father — who hasn't taken any of Morrell's shit throughout the movie — charges in, gives Morrell a good kicking and sends him skulking away with his tail between his legs and the promise that, if the boy's father ever sets eyes on him again, he'll be the one who ends up dead.
The Salton Sea: Pooh-Bear is both crazy and extremely dangerous. For instance, he nearly castrates the protagonist out of paranoia and because it's amusing to him.
Hector the Toad, who forces Tony to see his friend Angel dismembered with a chainsaw.
Tony Montana himself is a milder case. Although while his growing addiction to drugs increases, he gets increasingly aggressive and violent.
Schindler's List: Amon Goeth, the ruthless SS commander who oversees the extermination of the Krakow Ghetto, definitely counts. His first scene in the movie shows him using the prisoners in his concentration camp as target practice. He gets way worse from there. And the worst of all, it's all Truth in Television.
Hannibal Lecter is a cannibalistic serial killer, although a rather polite one. He escapes from his cage bludgeons his captors to death with a cool, detached expression on his face. He's the Villain Protagonist of the sequel, where he actually cuts off his own hand in order to escape at the end. Anthony Hopkins himself would be the first person to tell you that the guy's crazy.
"A census taker once tried to test me. I ate his liver with some fava beans and A Glass of Chianti. *hisses*"
Buffalo Bill tries to build a suit from the skin of the women he murders because he thinks that wearing it will help him become female.
Single White Female: From the number of people whom Heddy kills and impersonates she certainly seems to fall under the Axe Crazy heading.
Angela Baker: I've never chopped wood before, but I've chopped other things!
Snow White and the Huntsman: Queen Ravenna. Other versions have always been self-centered, vain, and downright cruel, but this version will kill anyone who defies her without a second thought. Plus the implication that she's killed plenty of kings in the past.
Star Trek (2009): Captain Nero wakes up in the morning looking for new shit to blow up. And with advanced tech from the future, he can actually accomplish this. Sometimes he switches it up a little and becomes a Bladed Romulan Sceptre Crazy, instead.
The Stepfather: The eponymous killer, whose sanity is shaky at the best of times, goes from perfect All-American dad to a ranting attacker who beats people to death with a wooden board or stabs them in them in the face with a rake at the drop of a hat.
Transporter 2: Trigger Happy Lola, the villain's Dragon. "Actually, my problem's not medical. It's psychological." (shoots the nurse.) And a few moments later: "What seems to be the problem?" "Me." (yet another burst of gunfire.)
John Candy's titular character in Uncle Buck pretends to be this to scare his niece's boyfriend Bug.
Versus: The Yakuza with the Green Shirt (Kenji Mastuda) from Kitamura's seems to be utterly and completely unable to be serious or show any signs of normalcy through the movie; he constantly makes faces and sounds, laughs like a maniac, screams and overall draws attention to himself by simply being a nutjob in every scene where he's present.
Who Framed Roger Rabbit: Judge Doom is for the most part, a calm, cool, and collected version. Then after he gets flattened he loses it and tries to kill Eddie in incredibly sadistic ways while letting Toon Town be wiped off the map.
Also from the film is one of Doom's weasel henchmen Psycho, who is always seen carrying a razor while in a straitjacket and even has Wingding Eyes.
All of them combined have absolutely nothing on X-24 from Logan. He's an evil clone of Wolverine, if he had the mindset of a rabid attack dog and was completely stripped of his sanity and morality. In fact, X-24 is so murderously psychotic and feral, he can't even speak in coherent sentences.