Kakashi: Without pause or hesitation, a young boy who was not even a ninja had killed over a hundred of the students.When a villain's origin involves the character (previously outwardly normal) suddenly flipping out and killing a large number of people in a single incident. Bonus points if any of these circumstances apply:
Zabuza: [smiling] That sure was... fun.
Zabuza: [smiling] That sure was... fun.
- The villain was just a kid at the time.
- The people killed included the villain's family.
- The villain had no real reason to do this.
- The villain killed off his entire people or clan in doing this.
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Anime & Manga
- Naruto has several examples.
- Zabuza is the earliest, having killed over a hundred potential graduates of his village despite not having any shinobi training himself. He was made a shinobi as a result and still remembers that event fondly. He's not quite a straight example, though; his actions brought needed reforms to the Shinobi education system of the Hidden Mist Village, by singlehandedly forcing them to end their Social Darwinist approach, and was also the last antagonist to comport themselves as professionals rather than screwed up psychopaths. One gets the feeling he cultivated his reputation as a Devil of the Hidden Mist for the sake of psychological warfare against targets.
- Itachi and Sasuke have a shared example in the destruction of the Uchiha clan. Despite being a young teen, Itachi single-handedly wiped out his entire clan aside from Sasuke before going on the run. He stated the purpose was to test his own skill but it was actually to prevent them launching a coup. The trauma of this would later lead to Sasuke turning villain.
- Hidan was annoyed that his village converted to a peacetime economy so he slaughtered his neighbors, potentially including his family, and went missing-nin. His partner Kakuzu was originally a loyal shinobi but after he was punished and imprisoned for failing in a near-impossible task he turned on them, slaughtering a large number of his comrades before becoming a bounty hunter.
- After seeing his teammate and love interest Rin killed by Kakashi, Obito Uchiha loses it in a violent and brutal display of primal fury and goes about slaughtering the enemy ninja who drove the two into that position in the first place. Thus opening the path to his career as Tobi.
- Fullmetal Alchemist 's Anti-Villain turned Anti-Hero Scar begins his serial-killing career by killing any and all available Amestrians - after waking up in a hospital to find that his entire family has been killed by the State Alchemist Kimblee and that his brother's arm has been grafted onto his body in the place of his own severed arm. He flips out and starts his rampage with the two Amestrian doctors who saved his life. Who are married. And who also happen to have a daughter who'll grow up to become a pretty good automail mechanic. Oh, the Humanity!!
- YuYu Hakusho: Sensui's Start of Darkness was like this: he flipped out upon learning Humans Are the Real Monsters, and killed everyone in the Black Black Club's villa. Coincidentally, the people he murdered were themselves enjoying a demon blood bath.
- There's quite a few sympathetic starts of darkness in Rurouni Kenshin, but the one closest to this trope is when Seta Soujirou murders his abusive relatives after they pushed him one time too many and ended up as The Dragon for a Social Darwinist.
- Sometimes the bloodbath happens because the person in question got pushed too far and snapped out. Just take a look at Lucy from Elfen Lied and what she did to the cruel kids in her backstory for beating the puppy that she'd started caring for to death.
- Rob Lucci of One Piece is a perfect example. His first mission as a CP9 agent was given to him when he was only a kid; to save some hostages from pirates... he killed not only the pirates, but all the hostages as well, because they were getting in the way/didn't deserve to live. And he got a nasty-looking scar on his back in the process, which coincidentally looks like the World Government flag.
- While the extent of her evil is very debatable, Evangeline McDowell from Mahou Sensei Negima! is convinced that she underwent this. Extra credit though for three out of four points getting hit. She had just turned 10 when it happened. It is implied but not outright stated that she killed her family, and she had no reason to do so. Though it is heavily implied she was either not in control of herself when it happened or she wasn't conscious of it and only realized it happened after it happened.
- An extreme example occurs in From the New World. The anime deals with a new age of mankind in which humans have developed telekinetic abilities. Unlike most anime of this genre, this anime explores the more realistic possiblities that could happen if even just one person develops such powers. Boy K (no real name given) seemed to just be a quiet child, but psychological exams revealed disturbing sociopathic tendencies. No one knew what to do with him, but they waited too long. Eventually, in the middle of class, Boy K let go of his humanity and tore his teacher apart limb from limb. He didn't stop there. He went on a full out rampage. Boy K slaughtered over 1,000 people on the first day alone.
- Villain Protagonist Light Yagami of Death Note takes his first step into corruption and madness when he goes on a massive killing spree after receiving the Death Note. Of course, he is not a little kid at the time (he's seventeen), he doesn't kill his family ( at least, not then), and he has a number of reasons for doing so (mostly because he's bored, disillusioned, and insane). That first week racked up a body count of five hundred.
Ryuk: ...You've taken quite a liking to it.
- The Plutonian from Irredeemable kicked off his reign of terror by leveling his patron city and massacring the inhabitants.
- He's actually the protagonist (one hesitates to say "hero") rather than the villain a lot of the time, but Lobo's origin story involves him killing off his entire race except for himself, because he was dissatisfied with the grade he received on a school project. Played for laughs, since Lobo was originally intended as a deconstruction of the whole GrimDark Anti-Hero fad of the 1990s.
- Purgatori was just a beautiful and young slave girl named Sakkara that was taken as a concubine by Queen Ostraca, until her generals forced her to put her entire harem to the sword to ensure the kingdom's stability. Sakkara managed to evade the massacre and found an ancient vampire lord who offered her immortality and a chance for revenge. She accepted and his bite turned her into a half-vampire, half-demonic woman, whose first act was to crash Ostraca's wedding and kill everyone inside, except for her former lover and her groom whom she inflicted A Fate Worse Than Death by turning them into vampires and locking inside their tombs.
- In The Jaded Eyes Series Harry snaps and murders the Dursleys when he's six years old.
- In Pony POV Series, this happened with Lord Tirek (who's a Composite Character of the G1 and G4 Tireks). The Prince of the Centaur Empire, Tirek was power hungry and fiercely feared losing his claim to the throne. Eventually, he ended up intentionally absorbing an ungodly amount of dark magic from one of Pandora's Boxes that Morning Star released into the mortal world and after spending some time mastering it, brutally annihilated his own kind.
Films — Animation
Films — Live-Action
- The original Halloween is one of the greatest, most notorious examples of this trope across all media, playing it entirely straight and fulfilling all three conditions. Michael suddenly flipped and, for no good reason, killed his older sister. Eventually, Dr. Loomis concludes that there's nothing to him, except evil.
- In the Star Wars prequel trilogy, Anakin Skywalker's Start of Darkness (murdering a camp of Sand People) and later his attack on the Jedi Temple. The slaughter of the Tusken Raiders was because they tortured and killed his mother.
- Dracula Untold, Vlad himself, twice; first when he first gains his vampire power and proceeds to Curb-Stomp Battle an invading army, then when he loses his wife and hits his Despair Event Horizon, he proceeds to do so again, but not until after turning what's left of his people into vampires.
- Harry Potter: Sirius Black killing a bunch of innocent bystanders is a subversion, as it was Peter Pettigrew who did so and for whom this trope does apply.
- In the Star Wars Expanded Universe, the origin story of Palpatine/Darth Sidious involves him throttling his family and their bodyguards to death, and intending to at the very least kill his father since he was born due to hatred of him, and for no reason other than his family forbidding his contact with Plagueis, as revealed in Darth Plagueis.
- Mistborn has a rare Anti-Hero example in Kelsier, who Snapped (i.e. became able to use his superpowers) after seeing his wife beaten to death by her overseers when they were slaves. "Many men had died that night."
- The Criminal Minds episode "Haunted" begins with a man having a psychotic break at a pharmacy and killing a number of the other customers.
- Rumpelstiltskin in Once Upon a Time goes on a killing spree after suddenly acquiring awesome powers. Justified by the fact that they were all soldiers trying to conscript his barely 14 year old son, and he was trying to protect the kid - but he was still evil, since the power was dark and corrupted him.
- When Angel first became the vampire Angelus, he proceeded to kill every single living person in his village, including his family.
- Ben Linus on Lost got his Start of Darkness by assisting the Others in poison-gassing all forty of the Dharma Initiative settlers. He gets 2 1/2 bonus points: he killed his father, making himself an orphan; he was a member of the community he destroyed; and he gets half a point for being barely out of his teens.
- Forgotten Realms: Sammaster's fall started in somehow similar way - he blasted slavers with spells, but in process also caused the deaths of the very people he tried to rescue. Not that he was the shining example of mental stability before this.
- Warhammer Fantasy Battles:
- Vilitch the Curseling used to be a shaman's apprentice, the weaker of two twins, constantly bullied and ridiculed for his weakness. When his prayers attracted attention of Chaos god Tzeentch, he was granted powerful magic as well as a powerful body to match (he was magically grafted on top of his brother's shoulders) His first act was to turn his power against the tribe, making the village "run with molten flesh".
- One rendition of Archaon's backstory relates that after having been driven insane by what he read in the Book of Necrodormu, he then slaughtered his family in cold blood before fleeing to Norsca.
- Warhammer 40,000 has Angron Primarch of the World Eaters. He was once a gladiator slave who along his fellow gladiators fought their way out to freedom against their Nucerian slavers. The Emperor sought him to join his crusade, but Angron refused, choosing to stay and die along side his brethren who are about to be cornered by the Nucerian armies. The Emperor then teleported Angron alone into his ship, leaving his fellow warriors to be slaughtered by the Nucerians. Angron never forgave the Emperor for what he did, when he became Primarch of the World Eaters his legion became the most brutal of them all, when Horus turned to Chaos he was one of the first Primarchs to join him, and soon became a Daemon Prince of Khorne. Indeed, when Angron was found by the slave traders who eventually sold him to the gladiatorial arena, he was naked, drenched in gore, and surrounded by the corpses of the Eldar assassination squad he'd butchered in self-defense when they attempted to murder him to pre-empt his falling to Chaos. Did we mention he was just a little boy at the time?
- Very common angst-oriented origin story for both good and evil Werecreatures in Werewolf: The Apocalypse. A tradition continued in Werewolf: The Forsaken, which, if anything, enforces the "don't forget that you're playing a monster" thing more harshly than its predecessor. The books make it quite clear that, if you're a Rahu (warriors who changed under the full moon), your First Change most likely involved someone dying horribly.
- Eclipse Phase includes "The Lost Generation", an attempt at accelerated maturation Gone Horribly Wrong that are all assumed to be this. Several of the survivors of the program ARE this, but not nearly all of them.
- In FEAR, Paxton Fettel fell into this trope as a kid during the so called "synchronicity event", during which he was possessed by Alma and killed several scientists using his psychic powers.
- In Fable II, if the player feels so inclined, after getting a sword they can slaughter the gypsies who raised them as a nice little warm-up before carving a bloody swath across Albion.
- Final Fantasy VII: Sephiroth begins his Face–Heel Turn with the infamous massacre at Nibelheim.
- Fatal Frame: Kirie and the Himuro Family Head, Sae and Reika. All save Himuro resulted directly from a botched sacrifice, and Himuro got the curse second-hand. They all suddenly engaged in mass-slaughter, their victims becoming enraged, vengeful ghosts themselves who continued to claim victims decades or even centuries after.
- So how does Soul Nomad & the World Eaters infamous Demon Path begin? By killing everyone in your village, of course.
- In Valis II (Japanese computer version), the origin story of Cruel King Megas is that, after being exiled by his kingly father, he returned to slaughter his entire family, tearing his brothers to pieces and eating his mother. Only his father's Heroic Sacrifice, turning him into a Sealed Evil in a Can, prevented further bloodshed... until the seal was broken.
- Trauma Team's CR-S01 unleashed a bioterrorist attack that killed everyone in Cumberland College, but with a twist - he has no memory of how or why he did it. It turns out that he was actually framed by his adoptive father Albert Sartre.
- Suikoden IV has Graham Cray, who is considered responsible for the destruction of his hometown in a Type 2. In reality, it was his son who fatally unleashed the full power of the Rune of Punishment against soldiers running a False Flag Operation. Becoming The Scapegoat on top of everything else just drove him into villany.
- Most of the cast of Twisted Metal: Black has this as their backstory
- A No Mercy run in Undertale starts out like this, with the player being required to track down every Random Encounter in the stage and kill them.
- Joe Darke in Ace Attorney, a businessman who panicked after accidentally running over a man with his car and started to kill the witnesses of the accident (and the witnesses of those murders too).
- Helen Narbon in Narbonic... insofar as she can be considered a villain. Apparently all mad scientists try to cause as much carnage as possible when they go mad and get full control over their mad science abilities. Some of them were already evil before they were mad.
- They aren't all necessarily villains in the normal sense, but most times the first notice the world has of a new "Spark" (mad scientist) in Girl Genius is the total depopulation of some village, usually that of the Spark.
- Danny Phantom: Dark Danny. In an alternate timeline, Danny's friends and family were killed in an accident that Danny was partially responsible for. In his grief, Danny had his Arch-Enemy Vlad Masters remove his ghost half... which then did the same to Vlad, merged with Vlad's ghost half, murdered the human Danny and went on a rampage for ten years.