History Main / BloodbathVillainOrigin

* In the reamke of ''Film/{{Halloween}}'', young Michael overhears that he's going to get some massive psychological intervention soon to try and curb his nascent SerialKiller tendencies. He decides to take advantage of his freedom at the moment and it being Halloween to exact revenge on: The bully who teased him about his mom being a stripper, his abusive dad, overbearing sister and her boyfriend.

* Rob Lucci of ''OnePiece'' 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 Marine flag.

* In the reamke of ''{{Halloween}}'', young Michael overhears that he's going to get some massive psychological intervention soon to try and curb his nascent SerialKiller tendencies. He decides to take advantage of his freedom at the moment and it being Halloween to exact revenge on: The bully who teased him about his mom being a stripper, his abusive dad, overbearing sister and her boyfriend.

* In the latest prequel to ''{{Halloween}}'', young Michael overhears that he's going to get some massive psychological intervention soon to try and curb his nascent SerialKiller tendencies. He decides to take advantage of his freedom at the moment and it being Halloween to exact revenge on: The bully who teased him about his mom being a stripper, his abusive dad, overbearing sister and her boyfriend.

See also WhereIWasBornAndRazed.

* Rob Lucci of ''OnePiece'' 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. Using rokoshiki, he killed not only the pirates, but all the hostages, because they were getting in the way/didn't deserve to live. Then he got a nasty looking scar on his back that coincidentally looks like the Marine flag.

* ''Very common'' angst-oriented origin story for both good and evil Werecreatures in TabletopGame/WerewolfTheApocalypse.

* ''Very common'' angst-oriented origin story for both good and evil Werecreatures in WerewolfTheApocalypse.

When a villain's origin involves the character (previously outwardly normal) suddenly flipping out killing a large number of people in a single incident. Bonus points if any of these circumstances apply:

* Helen Narbon in ''{{Narbonic}}''... insofar as she can be considered a villain. Apparently all mad scientists try to cause as much carnage as possible, just out of an instinctive compulsion, when they [[WithGreatPowerComesGreatInsanity go mad and get full control over their mad science abilities]]. Mind you, some of them were already evil before they were mad.
* Then there's [[StarWars dear Lord Vader...]]

* Helen Narbon in ''{{Narbonic}}''... insofar as she can be considered a villain.

* Lucy of ''ElfenLied''. Bonus point #1, minus points for having two separate flip-out incidents before it became a habit.

** It's also worth noting that said humans also had a pool filled with daemon blood, making this a literal example.

* Lucy of ''ElfenLied''. Bonus point #1, minus points for having two separate flip-out incidents.

* In the latest prequel to ''Film/{{Halloween}}'', young Michael overhears that he's going to get some massive psychological intervention soon to try and curb his nascent SerialKiller tendencies. He decides to take advantage of his freedom at the moment and it being Halloween to exact revenge on: The bully who teased him about his mom being a stripper, his abusive dad, overbearing sister and her boyfriend.

* There's quite a few sympathetic starts of darkness in RurouniKenshin, but the one closest to this trope is when [[StepfordSmiler Seta Soujirou]] murders his abusive parents after they pushed him one time too many and ended up as TheDragon for a {{Darwinist}}.

* FullMetalAlchemist 's AntiVillain [[spoiler:[[HeelFaceTurn turned]] AntiHero]] Scar begins his serial-killing career by killing any and all available Amestrians [[spoiler: after waking up in a hospital to find that his entire family has been killed by the [[CompleteMonster State Alchemist]] Kimblee and that his [[BadassTransplant brother's arm has been grafted onto his body]] in the place of his own severed arm.]] He [[BerserkButton flips out]] and starts his rampage with the two Amestrian doctors who saved his life. [[spoiler: Who are married. And who also happen to have a daughter who'll grow up to become a pretty damn good [[WrenchWench automail mechanic]]. OhTheHumanity!]]

* FullMetalAlchemist 's AntiVillain [[spoiler:[[HeelFaceTurn turned]] AntiHero]] Scar begins his serial-killing career by killing any and all available Amestrians [[spoiler: after waking up in a hospital to find that his entire family has been killed by the [[CompleteMonster State Alchemist]] Kimblee and that his [[BadassTransplant brother's arm has been grafted onto his body]] in the place of his own severed arm.]] He [[BerserkButton flips out]] and starts his rampage with the two Amestrian doctors who saved his life. [[spoiler: And who also happen to have a daughter who'll grow up to become a pretty damn good [[WrenchWench automail mechanic]]. OhTheHumanity!]]

* FullMetalAlchemist 's AntiVillain [[spoiler:[[HeelFaceTurn turned]] AntiHero]] Scar begins his serial-killing career by killing any and all available Amestrians after [[spoiler: waking up in a hospital to find that his entire family has been killed by the [[CompleteMonster State Alchemist]] Kimblee and that his [[BadassTransplant brother's arm has been grafted onto his body]] in the place of his own severed arm. He [[BerserkButton flips out]] and starts his rampage with the two Amestrian doctors who saved his life - who also happen to have a little girl who'll grow up to become a pretty damn good automail mechanic. SoYeah.]]

* Wormtail in ''HarryPotter'' killed 12 people by blowing up a street and made it look like Sirius Black had done it. (Not quite a StartOfDarkness, but no one knew Wormtail was working for Voldemort at this point.)