[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/parasyte.jpg]]

-> ''"''Parasyte'': Because ''Film/InvasionOfTheBodySnatchers'' was for pussies."''
-->-- '''WebVideo/YRulerOfTime'''

''Parasyte'' (Japanese: ''Kiseijuu'') is a {{science fiction}} {{seinen}} {{manga}} by Creator/HitoshiIwaaki. It ran from 1988 to 1995 and is particularly famous for its usage of BodyHorror.

One night, strange spores fall from the sky onto the earth. Out of them hatch weird little worms that quickly infiltrate human neighborhoods, looking for host bodies. The worms crawl or burrow their way into the head of a human host, transforming it and the brain inside. This effectively kills the victim, replacing the host's personality and intellect with that of the parasite. These parasites have a ravenous appetite for the flesh of the species they take over--in this case, humans.

But one specific worm goofs it up - because its intended target, an OrdinaryHighSchoolStudent named Shinichi Izumi, was wearing headphones, the parasite can't get to his brain, and instead ends up stuck inside Shinichi's right arm. Because of this unique situation, Shinichi and the parasite he nicknames Migi (meaning "right") are sharing the same body, but still possess their own individual intellects. This gives them an edge in battling the other parasites, who see Shinichi's ability to think independently as a threat. Shinichi also feels compelled to fight other parasites, who kill and eat humans as a source of food, whereas Migi, like other parasites, is incapable of emotion and only fights to preserve his own life. Thus, Shinichi is forced to deal with all kinds of teenage issues while keeping a horrifying secret and having to battle against hordes of other parasites who want to use him (like Ryoko Tamiya, a scientist and Shinichi's teacher), kill him (just about everyone else) or worse.

''Parasyte'' was first published in North America by Mixx (now better known as Creator/{{Tokyopop}}), which [[CulturalTranslation Americanized]] every character by changing their names (Ryoko Tamiya was renamed Tamara Rockford, while Migi was "Lefty" because the pages were reversed, for example), censored some sexual elements (though the graphic violence was left untouched), and did away with many Japanese cultural signifiers in the story. Publishing rights were later obtained by Del Rey, who re-released it, reverting the changes Mixx made and using a more accurate translation.

A 24-episode [[http://static.tvtropes.org/pmwiki/pub/images/parasite_poaster_1734.jpg anime adaptation]] by Creator/{{Madhouse}} aired from October 8, 2014 to March 2015. The anime modernizes the manga, using the same premise and main cast but also integrating things that were not commonplace during the manga's original run, like smartphones and the internet.

The manga was also adapted into two live-action films in Japan in 2014 and 2015. The films also modernize the setting and are more condensed compared to the anime.

Creator/SentaiFilmworks has announced home video license and distribution for the anime in five territories (North America, South America, United Kingdom, Australia, and New Zealand). ''Parasyte'' is one of the most requested titles to air on Creator/AdultSwim Creator/{{Toonami}} (even long before Sentai Filmworks made their announcement for home video rights), and eventually aired on the block beginning in October 2015.

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!!Tropes in this manga include:

* AbsurdlySharpBlade:
** [[spoiler:Uragami]]'s knife is able to slash a guy's throat open and decapitates a girl with ease ([[ArtisticLicenseBiology though the girl appeared to have no backbone...]]).
** The parasites' blades, cutting through people cleanly with almost no resistance.
* ADateWithRosiePalms:
** Played with when Migi tries to stimulate Shinichi's erection. It is Shinichi's right hand that's doing it, but he's not necessarily masturbating.
** Becomes an assumed excuse for a situation where Shinichi's mother barges into his room [[SorryToInterrupt without knocking]] and he has to hide Migi.
* AsteroidsMonster: The Shapeshifting {{Blob Monster}}esque parasites can separate into fairly small fragments.
* ArmorPiercingQuestion: The manga is filled with these. The moral and ethical standards we humans built for ourselves are put to question when a 3rd party enters our paradigm as a mirror to our [[NotSoDifferent inhumanity and savagery.]]
-->'''Migi''': Parasites can change their appearance easily. Humans won't be able to catch them.\\
'''Shinichi''': That's why we will chase them down-\\
'''Migi''': [[WhamLine And kill them?]]\\
[[BeatPanel ...]]\\
'''Migi''': Shinichi! [[TheStoic I don't have human feelings]]. I don't feel anything when I kill my own species. [[ArmorPiercingQuestion But what about you? Will you be able to kill them?]]
* AnArmAndALeg: [[spoiler:Shinichi]] loses his right arm when [[spoiler:Migi seemingly sacrifices himself to stop Gotou from killing them both]], [[SubvertedTrope he gets better though.]]
* ArcWords: "Are you really Izumi-kun?" Satomi asks this when Shinichi starts acting strangely. At first, it's a joke, but it becomes an increasingly real question over the course of the series.
* AxCrazy: [[spoiler:Uragami]]. Crosses into MoralEventHorizon and NauseaFuel territory when [[spoiler:he is shown remembering how he got captured, which includes visuals of some of his victims, one of whom he had sex with after he decapitated her]].
* {{Badass}}: Shinichi and Migi
* BioAugmentation: Shinichi gains superhuman powers after Migi heals his heart using his own blood.
* BadassBookworm:
** Migi spends a ''lot'' of time reading and studying when Shinichi is relaxing in his bedroom.
** Shinichi averts this due to having to spend so much time fighting or fleeing from the Parasites [[spoiler:and it comes back to bite him big time; see BittersweetEnding]].
* BadPowersGoodPeople: Shinichi is one of the kindest people in the entire series, but he has a LovecraftianSuperpower.
* BattleAmongstTheFlames: The climatic battle takes place in a ''nuclear waste incinerator'' in the movie adaptation.
* BeCarefulWhatYouWishFor: Earlier Shinichi wishes [[spoiler: that Migi would fall asleep forever]] and when he finally does so by the end of the series Shinichi is visibly distraught.
* BettyAndVeronica: Shinichi gets into something of a LoveTriangle with his current girlfriend, Satomi Murano (Betty), and the rebellious girl Kana (Veronica). [[spoiler:Kana unfortunately dies, and because of the missed schooling, his future with Satomi is uncertain at best.]]
* BigNo: Shinichi has one when [[spoiler:Uragami is about to cut Satomi's throat]], and again when [[spoiler:she's falling from a building]].
* BittersweetEnding:
** [[spoiler:The Parasites' organization is broken, Gotou is dead and the Parasite race is apparently on the decline. Once again without a "natural predator", it's left unclear if humanity will indeed render Earth completely uninhabitable one day.]]
** [[spoiler:Shinichi and Murano are happily living together. However, because of all the school he missed fighting the Parasites, Shinichi can't get into college right away, leaving his future uncertain.]]
** [[spoiler:Migi allows himself to be absorbed into Shinichi, having apparently come to finally understand and admire the human empathy and curiosity he once disdained.]]
** [[spoiler:Jaw and Mamoru Uda continue to coexist peacefully, to the point Jaw is going a bit senile.]]
* BladeOnAStick[=/=]CombatTentacles: Parasites fight by twisting into long whiplike stalks with razor-sharp blades on the end.
* BloodKnight: Gotou claims he only lives to fight at one point.
* BlueAndOrangeMorality:
** Migi has no qualms about [[spoiler:pickpocketing in order to remain undetected]].
** Shinichi very briefly goes into Blue and Orange ''Insanity'' when he decides that [[spoiler: humans have no right to kill an organism just because it's harmful to humans and no right to impose human values on Parasites. He changes his mind after coming to the conclusion that all he can do is act as a human and protect humans, though at this point in his CharacterDevelopment, he holds no malice against the monster he has to kill.]]
* BodyHorror: To put it mildly, it's the page image on the trope page for a reason.
* {{Bowdlerisation}}: The scene where Migi transforms into a phallus is edited into a snake in the Tokyopop version of the Manga.
* ButNowIMustGo: [[spoiler:Migi decides to fall asleep permanently at the end of the series.]]
* CannibalLarder: Horribly mangled body parts are found all over the world. Unusual in that the culprits are not cannibalistic humans, but alien bodysnatchers who [[ToServeMan eat people as a source for food]].
* CarFu: Migi tries it on Gotou.
* CatchAndReturn: [[spoiler:Gotou to the soldiers]].
* CharacterDevelopment: The series looks into how a human can establish a mind of a monster (Shinichi), while a monster can become more humane (Migi and Tamura).
* ChekhovsGunman: So, you remember [[spoiler:Uragami, the SerialKiller]] the police brought in to help identify parasites? The one who disappeared during the big police raid? He comes back [[spoiler:in the last chapter]].
** Earlier in the story where Migi meets another parasite that had succeeded in its invasion, it mentions that Migi should move away from Shinichi and into his right hand. Migi asks if it is even possible. [[spoiler:Later on, the {{Big Bad}} turns out to be a mass of parasites in a body, with two capable of controlling them all as the head.]]
** When Gotou escapes from city hall, he is shown to have two bullet wounds where Yamagishi and his troops shot him. [[spoiler:It's the same spot where Shinichi will later stab him with the toxic metal rod, leading to Gotou's defeat.]]
* ChickMagnet: TheProtagonist is depicted as one. Murano, his girlfriend(-to-be), obviously likes him. On a trip, he meets a girl on a boat who, later on, keeps following him around. Kana is also continuously stalking him [[spoiler:with help of her special powers]] and [[spoiler:has some sort of white-knight wet dream about him. TWICE]].
* TheChikan: Tamura is introduced dealing with one on a subway ride and tossing him off the train at a stop.
* CoolOldLady: Mitsuyo
* ContrivedCoincidence: [[spoiler:Shinichi's parents ''just so happen'' to be finishing a holiday in the immediate vicinity of a parasite who, thanks to a series of accidents, needs a new body. The result is that Shinichi's mother is beheaded so her body can be taken over.]]
* CrazyEnoughToWork: {{Invoked}}. When [[spoiler: Miki and Shinichi split up to deceive Gotou]], Miki thinks that "this is an extremely reckless strategy. But that means even Gotou is unlikely to anticipate our strategy."
* CreepyMonotone[=/=]SpockSpeak: How all the parasites talk (except for Uda's). When a human starts speaking this way, it's a tipoff that they've been possessed.
* CripplingOverspecialization: The parasite who [[spoiler:killed Shinichi's mother]] always goes for a OneHitKill by stabbing its enemies in the heart. When Uda's parasite realizes this, [[spoiler:he's quick to protect Uda's heart in prevision and behead the enemy parasite from behind after being left for dead.]]
* DeathGlare: Being host to Migi gives Shinichi the ability to unleash awesomely powerful glares, representative of people being able to sense how deadly the pair of them are (the series supposes that animals are able to instinctively tell when another animal is more powerful than them and Shinichi and Migi are FAR deadlier than an human).
* DeliverUsFromEvil: Reiko is revealed to be pregnant after having sex with A, another parasite-infested human. She originally plans to bear the completely normal human child out of dispassionate scientific curiosity, but finds herself driven to protect her baby once it's born.
* DiagonalCut: The parasites' preferred killing method.
* DiscardAndDraw: In a successful effort by Migi to save Shinichi's life, Migi sacrifices part of himself and now has to go into hibernation for a few hours each day, during which time Migi cannot wake up at all and is useless. On the plus side, this incident left Shinichi with superhuman physical capabilities at all times.
* DoesThisRemindYouOfAnything: How did Shinichi prevent Migi from reaching his brain? By tying his earphones' wires into a tourniquet around his own arm. Lampshaded--his parents walk in soon after and ask if he's abusing drugs.
* DwindlingParty: What happens to Yamagishi's unit when they go up against Gotou.
* EarnYourHappyEnding: [[spoiler: Shinichi is forced to go through a lot as well as witness the death of many people close to him but in the end the mince meat murders have stopped and he finally gets to be Murano.]]
* EnemyCivilWar: How [[spoiler:Gotou]] is defeated.
* EvilLaugh / LaughingMad: Tamura, upon discovering she's starting to take on human traits.
* EvilHand: Subverted; Migi can do a lot of nasty things, but isn't really evil.
* ExpositoryHairstyleChange: Shinichi has one after [[spoiler:he kills the Parasite responsible for his mother's death. He goes back to his first in the end]].
* FakingTheDead: That's how [[spoiler:Jaw/Parasite]] manages to survive the attack from [[spoiler:Sinichi's mother parasite]]. After realizing that its opponent was going for a OneHitKill, by trying solely to pierce its host's heart, [[spoiler:it changed the locations of the organs and let itself be hit]]. Afterwards, it just needed to wait for the perfect occasion to do a sneak attack, and its plan worked without a hitch.
* FanDisservice: PantyShot on a woman chopped in half. Later there's a [[ILoveTheDead necrophiliac]] and a [[ImAHumanitarian humanitarian]] moment. [[{{Squick}} At the same time]]. And then there's also the scene of Uragami [[ADateWithRosiePalms polishing his rocket]] when seeing a pretty girl.
* FeelNoPain: The Parasites [[ExactlyWhatItSaysOnTheTin do not feel pain at all]], but they can notice the danger of their surroundings and their injuries.
* FiveFingerFillet: Invoked when Shinichi tries to expose Migi, who reacts with a BareHandedBladeBlock.
* FiveRoundsRapid: Played straight, as most Parasites can ignore bullets. Subverted when [[spoiler:it actually works on Reiko, and after the humans start using high-powered shotgun ammunition]]. DoubleSubverted when [[spoiler:THIS doesn't work on Gotou]].
* ForTheEvulz: Most Parasites only commit atrocities when they ''have to'', only a few of them revel in doing it. Played straight with Uragami, a ''[[HumansAreTheRealMonsters normal human]]'' who enjoys murdering people just because he ''wants to''.
* GagPenis: After discussing with Shinichi regarding his attraction to Satomi, Migi shapeshifts into a giant erection while the two are at a restaurant. She doesn't notice.
* GaiasVengeance: Reiko Tamura [[spoiler:and the totally human Takeshi Hirokawa]] believes the Parasites were created to cull the human population to preserve the earth.
* GoodEyesEvilEyes: A good way to tell who's a Parasite (see UncannyValley on the YMMV page).
** Subverted a few times - some humans have the same look in their eyes as the parasites do. There's also Miki, a parasite who learned how to look and act genuinely human.
* {{Gorn}}: Dear GOD the Gorn.
* GoryDiscretionShot: Used exactly once: [[spoiler:Shinichi's mother's death.]]
* GreenAesop: Actually subverted towards the end. Shinichi comes to the realization that no matter how much humans want to empathize with other creatures and understand nature, at the end of the day they're just humans and can only live as humans, for better or worse.
** ''You can't care about the planet without caring about mankind as well.'' [[http://www.mangahere.com/manga/kiseijuu/c063/28.html First panel.]]
* HalfHumanHybrid: Shinichi becomes one when Migi uses some of his body mass to repair the stab wound caused by [[spoiler:the Parasite that took over Shinichi's mother]]. This results in advanced strength and reflexes, and also in Shinichi [[SociopathicHero seemingly becoming more emotionless for a time]].
* HandicappedBadass: While [[spoiler:separated from Migi and thus having a stump for his right arm]], Shinichi manages to catch six mosquitoes in less than a second.
* HeroicHost: When the Parasites don't kill you by absorbing your head.
* HeroicSacrifice: [[spoiler:Migi,in a very touching scene]]
* HorsebackHeroism: Shinichi, in Kana's dream.
* HorrorHunger: Every Parasyte is driven to eat humans by nature, even though Tamiya Ryoko proves that they can survive by eating a diet similar to that of humans.
-->'''Tamiya''': “Flies know how to fly without being taught. Spiders know how to spin webs without being taught. Why is that? Here’s what I think: Flies and spiders are simply following an order. I believe all lives on Earth have received orders of some kind. Don’t humans have any directive? When I took over this human’s brain, I received a directive. It said, Devour this species.”
** Migi and Jaw are the sole exceptions of their species as they never took over a human brain nor do they need to eat for sustenance.
* HumanityIsInfectious: [[spoiler:Ultimately the case with the surviving Parasites. After enough time passing as humans, they stop thinking of themselves as nonhuman.]]
* HumansAreFlawed: Going hand-in-hand with the subverted GreenAesop, this is Shinichi's view at the end.
* HumansAreTheRealMonsters: Sort of touched on. The Parasites at least believe this is the case.
* ImpostorExposingTest: The military figures out a way to use an x-ray machine to separate a group of mixed humans and Parasites. Before that a simpler method was devised in plucking hairs since, for a parasite, the ambulatory but non-sentient cells would writhe before dying.
* ItsPersonal:
** After [[spoiler:a Parasite took over Shinichi's mother and came very close to killing him]], Shinichi becomes a bit more ruthless in his pursuit.
** Averted when he's beaten [[spoiler:Gotou, and the pieces are trying desperately to reunite, probably in vain]]. He's about to leave him like that, but instead makes it clear that it's NothingPersonal before dispatching him, thereby also nicely averting OnceIsNotEnough, because he makes ''sure'' that he's dead.
* KillItWithFire: Strangely averted here, as practically everything else gets used - dismemberment, impaling, gunfire from [[FiveRoundsRapid bullets]] to shotguns, and on one occasion, ''[[ImprovisedWeapon a rock]]''. Flamethrowers are briefly considered, but rejected. The one time it's used [[spoiler:(Shinichi's plan to hit Gotou with a flaming spear while Migi takes off his head)]] fails.
* KillTheCutie: [[spoiler:Poor Kana.]]
* LackOfEmpathy: All of the Parasytes. Shinichi goes through this for a while after he's partially merged with Migi. Migi and Tamura eventually get a little better about this as well.
* LastStand: The battle at city hall is this for Hirokawa's parasites. Ironically, [[spoiler:Yamagishi and his troops - the men who eliminated the aforementioned parasites - end up in a [[LastStand last stand]] of their own against Gotou]].
* LeaningOnTheFourthWall : When a report on the parasites is given as "''In a way that everyone will be able to understand''", and a page later when some "Obvious" information is delivered; one character negates by thinking "''I did not know that''"
* LifeOrLimbDecision: Invoked. Shinichi is just GenreSavvy enough to tourniquet his own arm and prevent Migi from reaching his brain -- and it's just the first chapter.
* ALighterShadeOfBlack: While the Parasites are ruthless mass murderers that want to take over humanity, they are definitely much better in comparison to [[spoiler:Uragami. In fact, some of the Parasites even develop a human conscience over the course of the series]].
* LosingYourHead: Shinichi to [[spoiler:Gotou's head in their first fight]]. [[NighInvulnerable Of course]], he doesn't really care.
* LovecraftianSuperpower: Guess who?
* MamaBear: Tamura of all people managed to pull this one on the detective when he threatened her child.
* {{Masquerade}}: The Parasites try to maintain one, but it breaks down very early. The government, meanwhile, is less about "Masquerade" and more about "information control," releasing information to the public as needed to avert panic.
* MoreDakka: About ten men shooting [[spoiler:Gotou]] with assault rifles, shotguns and a grenade launcher at the same time. Even more after, up to 53 people. [[spoiler:[[NighInvulnerable He doesn't care]]. See also CatchAndReturn]].
* MuggingTheMonster: A bully and rival for Murano's affections tries to beat up Shinichi. Shinichi tries to avoid the fight at first, but the bully is having none of that. It doesn't end well.
** Also Mitsuo, another bully and Kana's ex-boyfriend. After Kana dumps him, he tries to beat up Shinichi again in revenge. [[CurbStompBattle It ends about as well as one would expect.]]
* MundaneUtility: Shinichi using Migi to deliver the ultimate FastballSpecial in chapter 24 counts as this.
* MySensorsIndicateYouWantToTapThat: Migi. He even shapeshifts into a [[GagPenis gargantuan penis]], in public, because of this.
* NiceJobFixingItVillain: At first Kuramori refuses to help Shinichi fight the Parasites out of fear for his family. However, the Parasites associated with Tamura decide to eliminate him because of his knowledge. The attempt fails, with Kuramori's wife and daughter ending up murdered, turning Kuramori into a grieving, vengeful father and widower with nothing left to lose. Tamura chews out the Parasites responsible because of this.
* NighInvulnerable: Gotou.
* OffWithHisHead: Parasites tend to go for the head, whether they're infecting (X-rays of the host bodies reveal they have no skulls) or just feeding.
* OhCrap: The Parasite who [[spoiler:took over Shinichi's mother's body]] has several during its fight against Shinichi, who is able to follow its movements, something that should not be possible.
* PaperThinDisguise: Normally averted by the Parasites, but Mamoru's Parasite attempts this by giving him a ridiculous jawline when he and Shinichi have to kidnap somebody.
* ParanoiaFuel: [[invoked]] The police's efforts to keep a full-scale public panic from happening should the Parasites' existence become known are a minor but recurring plot point.
* PlayedForLaughs: Shinichi and Migi's interactions.
** CrossesTheLineTwice: Shinichi and Migi meet Mamoru Uda, part of a second human-Parasite pair much like themselves, only this one inhabits the lower half of Mamoru's face. Mamoru is depicted as going from TheWoobie to the Parasite's personal ButtMonkey from the get-go.
* PlayingPossum: [[spoiler:Jaw/Parasite made Sinichi's mother parasite think it was dead, and bid its time before finishing it off when it was distracted by Sinichi]].
* PoliceAreUseless: Played straight early on, when the cops are just as clueless about what's going on as the rest of the country. By the end of the series, however, they've learned all about Parasites, come up with a method of testing to reveal their presence, and developed completely ruthless tactics to kill them.
* PowerPerversionPotential: Averted, Migi's ability to turn Shinichi's hand into a giant penis or mass of writhing tentacles never comes up (as by the time our hero's in a relationship, [[spoiler:Migi's asleep for good]]).
* PrimalFear: Shinichi can unconsciously cause people to experience this, especially when he's being threatened.
* ProductPlacement: Unintentional, but the appearance of an undisguised [=McDonald's=] in chapter 2 is a fairly rare sighting in manga.
* TheQuisling: [[spoiler:The mayor]] was a human all along.
* RadiographOfDoom: A large x-ray is used to spot the parasites near the end.
* RemovingTheHeadOrDestroyingTheBrain: Subverted - taking the head clean off should kill a Parasite, but they can regenerate from most partial injury. Going for the vital organs tends to work better.
* {{Revival}}: In 2014, as both an anime and LiveActionAdaptation after ''over 20 years!''
* RiddleForTheAges: It's never revealed what the parasites are, where they came from or why Kana and Uragami could sense them.
* {{Ronin}}: [[spoiler: Shinichi fails the university entrance exams due to missing so much school, and has to study and catch up in the epilogue. Fortunately, Satomi is there to help.]]
* RuleOfCool: The Parasites' ability to distort bodies is pretty damn awesome.
* RuleOfSymbolism: Reiko holding her baby [[spoiler:and shielding it from bullets while the cops are shooting her to death]] starts to [[PietaPlagiarism resemble a certain Virgin...]].
* ScarsAreForever: Shinichi picks up large scars on his chest and back as a result of Migi saving his life, and a scar through his right eyebrow thanks to Gotou.
* ShapeshifterWeapon: Parasites can transform the parts of their hosts' bodies that they've taken over (usually just the head) into...''things'' that can shred human flesh ''faster than the eye can see''.
* ShotgunsAreJustBetter: The task force commander figures out very quickly that a shotgun blast to the heart will ''destroy'' a human heart, and thus kill the Parasite near-instantly.
* ShoutOut:
** The Parasites' body distortion mentioned above seems to be inspired by [[http://www.doc.gold.ac.uk/~mas02fl/MSC101/Vision/Pics/EscherBondUnion2.jpg [=MC=] Escher's 'Bond Of Union']], by way of Creator/JohnCarpenter's ''Film/TheThing1982''.
** The idea of the Parasites taking over the government to some degree is most definitely inspired by ''Film/TheyLive''.
* ShutUpHannibal: [[spoiler:The soldiers don't wait to the end of Takeshi Hirokawa's speech to shoot.]]
* SociopathicSoldier: Yamagishi is a soldier, not a cop, and the raid on Hirokawa's building demonstrates ''why'' you don't use soldiers for police work under any kind of normal circumstances. His objective is not to preserve civilian lives, but to eliminate the enemy. The moment things start to go south, he orders every civilian in the area to cooperate or he'll shoot to kill, and his soldiers willingly shoot through a HumanShield to exterminate a Parasite. The attached police express serious reservations at his willingness to casually kill people.
* SurpriseJump: A nervous Shinichi is tugged at from behind by a young girl. [[spoiler:Because of his newfound powers, he jumps a good 20 feet or so.]]
* TenMinuteRetirement: Kanamori decides to opt out of further investigation after witnessing a Parasite battle firsthand. He's just an ordinary human, not a monstrous superhuman like Shinichi, he has a wife and child, and the whole thing is just ''not his fight''. [[spoiler: Little late for that. [[TheCallKnowsWhereYouLive The Call Knows Where He Lives]] and his wife and child are eaten, causing him to go to the police.]]
* ThemeNaming: "Migi" (Japanese for right) and "Jaw" are named for the parts they're inhabiting in their respective hosts - the right hand and jaw.
* TheyLookLikeUsNow: [[spoiler:As time goes on, the Parasytes become more and more human, until finally there's no difference between them and ordinary people.]]
* TinMan: The Parasites all claim to have no emotions; in truth it's actually more complicated. They seem to lack empathy and are generally cold and expressionless, but seem to have something like bloodlust. As for human emotions, they seem to have some that they may feel in different degrees, but they apparently can (with time) develop complex personalities and emotions, like Tamura protecting her son and Migi valuing Shinichi's friendship and sacrificing selflessly for him. See TheyLookLikeUsNow for the final results.
* TitleDrop: When [[spoiler:Hirokawa gives his final speech, calling humans "worms - or [[TitleDrop Parasytes]]. "In the original Japanese he calls them parasitic insects (kiseichuu) and corrects himself to parasitic beasts (kiseijuu AKA the Japanese kanji).]] Unfortunately it's not present in the well-known free scanlation.
* TookALevelInBadass: After recovering from the stab wound that pierced his heart, Shinichi can run at what looks like more than thirty miles per hour, jump more than twelve feet high without a running start, and has reflexes that allow him to actually dodge and turn aside Parasite attacks, which are ''faster than the human eye can see''. He definitely leveled up.
* TranquilFury: "Migi... handle the defense."
* TruthInTelevision: Whenever the Parasites attempt to do something like punch a hole in a wall, they will sustain serious injuries. Migi is the only exception because he's the hand itself.
* UnableToCry: Shinichi finds himself unable to shed any tears after he is turned partly parasite by Migi, even when [[spoiler:he is forced to kill his own mother, or when Kana is killed by a parasite. He is finally able to cry again when Tamura's sacrifice for her child reminds him of his own mother.]]
* VisualPun: Since Parasytes only feed on the same species they take over, the first Parasyte-dog is seen eating another dog. Which would make it ''literally'' [[CrapsackWorld a dog-eat-dog world out there.]]
* VomitingCop: "Don't puke in the crime scene."
* WainscotSociety: Hirokawa's group of parasites function a lot like a mafia. Hirokawa serves as the mundane mayor of a city and establishes feeding areas for the safety of all of them where dead humans can safely be disposed of. When a parasite kills [[spoiler: Kana]] out of town and Shinichi kills him, they let it go because the guy was clearly a dangerous fuckup, but when Shinichi kills one of their own ''in the dining garage'', it's an act of war and even Tamura has to reluctantly give the go-ahead to wax him.
* WhamEpisode: Chapter 11 contains horrifying amounts of wham.
* WhatHappenedToTheMouse:
** Characters such as Mitsuo, Detective Hirama and Miki just disappear from the story without mention.
** [[spoiler:Happens in-universe to all the parasites after the raid on City Hall and their existence becoming public knowledge as attacks and sightings of them all but disappear. It's believed that they realized that open attacks and attempts to organize against humanity is dangerous for their survival and that they adjusted their diet to eat regular human food.]]
* WillTheyOrWontThey: Shinichi and Murano. [[spoiler:They will.]]
* TheWormThatWalks: [[spoiler:Gotou]] is made of several Parasites, with each controlling a limb.
* XtremeKoolLetterz: Paras'''y'''te, [[Creator/{{Tokyopop}} Mixx]]'s MarketBasedTitle for ''Kiseijuu''; Mixx used it to refer to the Parasites; Del Rey used the normal spelling to refer to the creatures, but kept Mixx's title.
** The interesting thing in the original version is that there are two Japanese words for "parasite" that are used in the series. The less common one is used when referring to the creatures, but the common one is used only once - [[spoiler: when Tamura refers to Humans themselves as the parasites of planet Earth.]]
** And then there's the last one when [[spoiler:Hirokawa gives his final speech, calling humans "worms - or [[TitleDrop Parasytes]]."]] Unfortunately it's not present in the well-known free scanlation.
* XMeetsY: ''Anime/MidoriNoHibi'' with a [[DarkerAndEdgier grim version]] of Creator/JunjiIto.
* YourApprovalFillsMeWithShame: Shinichi can tell he's not acting normally when Migi tells him that what he's doing is normal for [[TheSpock his species.]]

!!Further tropes in the anime include:

* AccentAdaptation: Mitsuyo is given a Southern Accent in the dub.
* AluminumChristmasTrees: In Episode 21, Commander Yamagishi of the SAT fires his [[ShotgunsAreJustBetter AA-12]] from the hip with one hand. If this was any other shotgun, it would be ridiculous. But the AA-12's recoil actually is low enough [[http://www.businessinsider.com.au/11-unbelievable-weapons-that-only-america-has-2014-9#aa12-atchisson-assault-shotgun-2 that it can be fired one-handed.]]
* AscendedExtra: One of Shinichi's classmates, a girl with glasses named Yuko who briefly appears in the manga, appears as a friend of his in the first episode where she even has more lines than Satomi and her role is expanded more later in the anime.
* AwardBaitSong: The ending theme, ''[[https://www.youtube.com/watch?v=9KuvWnmJvOI It's The Right Time]]'' by Daichi Miura.
* ConspicuousCGI: The office workers when talked to in the lobby in episode 19 and 20.
* {{Dubstep}}: Sometimes used for action scenes.
* EarlyBirdCameo: The first episode of the anime shows [[spoiler:Uragami the SerialKiller at the end,]] long before said character's first appearance in the manga.
* GoryDiscretionShot: There is still blood and gore, but the anime uses these far more than in the almost completely unreserved manga.
* IdiosyncraticEpisodeNaming: Each episode is given the title of a famous book.
* NerdGlasses: Shinichi gets them.
* OminousLatinChanting: Used for upcoming episode previews and sometimes in dramatic scenes.
* PragmaticAdaptation: The anime is taking some liberties with the story since the original manga took place in the late 1980s and early 1990s, but the overall premise, story, and tone remain unchanged so far.
* RightForTheWrongReasons: How did the flatfoots finally bring in SerialKiller Uragami? They caught him ''fiddling around with the {{Gorn}} left by actual parasites.''
* SettingUpdate: The anime is set in 2014 or at least the 2010s. The manga was written before cellphones and the internet became commonplace, which naturally affects the plot. It remains to be seen how the anime will adjust. The update also extends to adjusting the character design from Iwaaki's 1980s style to a more contemporary one, as seen in elements like Satomi's new hairstyle and a completely different design for Kana's jerk boyfriend who no longer looks like a classic JapaneseDelinquent in a military-style uniform.
* ShoutOut: Shinichi and Murano contemplate seeing a movie called ''[[Literature/TheRing Sadako 2D]]''.
* SpoilerOpening: The opening theme sequence shows most important characters in the story [[spoiler:like Reiko, Kana and Gotou]], most of whom didn't appear in the first episode. It also shows that Shinichi will lose the glasses and change his hairstyle, and hints at [[spoiler:the death of Shinichi's mother.]]
* TakeThat: As if nodding to WorstNewsJudgementEver, the newspapers go from reporting sex scandals to the "Mincemeat Murders" once the Parasyte invasion is underway.
* WhatTheHellHero: When Shinichi detects a puppy that got hit by a car, Migi determines that it would be dead within ten minutes. Sure enough, the puppy dies, but Shinichi doesn't show any emotional attachment or respect to it, and just throws it into the trash bin. Satomi calls him out on it, and the wake up call makes him realize how much he's changed. He gives the puppy a proper burial afterward.
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