* ArcFatigue: The final arc is getting this for the repeated SayMyName between Kurono and Tae as well as the slow pacing.
* AngstWhatAngst:
** [[spoiler: Cloned]] Kurono seems to get over the fact that he is not [[spoiler: the "real" one]] rather quickly. Of course, living with an IdolSinger who falls head over heels for him obviously helps. [[spoiler: This is averted later, during the alien invasion, since Clone Kurono develops anxiety over the fact that he isn't the ''real'' one when things get stressful.]]
** [[spoiler: Original]] Kurono is also quick to accept the fact that [[spoiler:he has a clone and is not too shocked when faced with said clone]]. The two resolves their love problems within ''one page''. Probably justified since the [[spoiler: alien invasion is imminent]], and both of them just want to live peacefully [[spoiler: while they still can]].
%%* {{Anvilicious}}: The final episode of the anime.
* SugarWiki/AwesomeMusic: The opening to the anime, [[https://www.youtube.com/watch?v=MCp8pw2l688 Super Shooter]] by Rip Slyme. And it's full of GratuitousEnglish.
* BaseBreakingCharacter: %%** Nishi came 1st in the official character popularity poll and has a ton of (often yaoi) fanart dedicated to him in the Japanese fandom. He's pretty popular in segments of the English-speaking fandom too. Some would say this has devolved into DracoInLeatherPants treatment. To others he's TheScrappy. You either love him or hate him.
** Tae is either a useless DamselScrappy or a nice, loving and caring girl who is unwillingly in shit way above her head but is vital on Kurono's CharacterDevelopment.
* BrokenBase: How some people feel about ''Gantz: O.'' To some it improves on the manga because it heavily tones down the for-the-sake-of-it edginess, the main cast doesn't consist of homicidal {{Jerkass}}es, and Kato is the protagonist instead of [[BaseBreakingCharacter Kurono]]. For others, this LighterAndSofter approach is exactly what makes it charmless and tame to the point of innocuousness, especially since in the part of the manga that the movie adapts [[spoiler: Kurono is already dead and]] Kato is the protagonist but he's changed a bit too much for some.
* BigLippedAlligatorMoment:
** That entire scene in the Room of Truth. Some extremely powerful god-like aliens deliver soul-crushing {{Breaking Speech}}es to the heroes before sending them right back to the Giant Alien mothership to finish the series. Said god-like aliens are never seen or mentioned again, and even without the abrupt nature of the ending, they seem to exist solely to justify the Gantz technology, and pretty much explicitly say "So ... yeah ... you did what we wanted you to do, we're done with you now, your 21 grams of data can have a nice eternity being reincarnated, or not, we don't really care either way."
** It specially comes off as random given the fact that the aliens' nihilistic speech seems to foreshadow some kind of [[DownerEnding Horrifying Ending]], but since [[spoiler: the ending of the series is a ''happy'' one they come off not only as random, but outright ''wrong'' on their assertions towards the Gantz team. This may be an IntendedAudienceReaction, since ''Gantz'' becomes surprisingly optimistic towards the end and its main message is "the universe is a terrifying place, but the people within it can make life worth it". ]]
** Early on, a chapter involved Kikuchi (a journalist that interviewed Kurono previously, helping to trigger his erased memories) going to Germany to continue his investigation on Gantz, while being aided by [[OccidentalOtaku a German otaku]] who speaks broken Japanese. At the end of the chapter, the German guy starts speaking fluent Japanese, causes mass destruction with his mind and finally teleports away pretty much like Gantz teleports the hunters. Some would think that it would tie with the story and get explained later on... but [[LeftHanging it never was]].
* DamselScrappy:
** Tae gets under the skin of some readers because she needs to be rescued often. Another source of hatred has been the fact she's not as attractive (thus "good for Kurono") as [[FanPreferredCouple Reika]].
** Then again, she's only this compared to the Gantz teams, by the standard of every other character she's nothing short of an ActionSurvivor.
* DesignatedHero: Kurono does some terrible things in the early parts of the story. He gets better.
* DesignatedVillain: Some aliens only try to live normal lives, without bothering anybody. Although aliens that are really dangerous and want to cause mayhem on earth appear in the later parts, specially in the last story arc...
* EnsembleDarkhorse: Even being a RedShirt, the sniper guy in the buddhist temple mission was quite liked by the fans, mostly due to him [[ColdSniper calmly killing several aliens for afar while counting the deaths]] and some other badassery. His fame was enough for him being playable in the Playstation 2 video game.
* FanNickname: [[spoiler:Clonerono]]. Also, "Muscle Rider" for Daizemon Kaze (which is his in-story nickname, but only Gantz and Takeshi call him that).
* FanPreferredCouple: Kurono/Reika... with the interesting twist of [[spoiler:having two Kuronos now]]. Other fans see her as a scrappy.
* GrowingTheBeard:
** For the first 9 volumes, Gantz was a GuiltyPleasure consisting of naked women, {{Gorn}}, and a JerkAss AntiHero. Along came Tae and much needed CharacterDevelopment for the protagonist, and the manga never looked back since.
** The Bhuddist Temple Mission is usually the point where people say ''Gantz'' goes from nothing more than sex and violence to sex and violence [[DoesThisRemindYouOfAnything with a point.]]
* HilariousInHindsight:
** [[Series/DoctorWho Angel statues that turn out to be killer aliens.]] [[TheFourthWallWillNotProtectYou Then it turns out ALL THE STATUES ARE LIKE THAT.]]
** Some of the guns have top-and-bottom triggers, needing both held down to fire, long before Nerf started introducing battery-operated dart guns that relied on that system.
* HollywoodHomely: Tae. Her face is a bit unusual compared to most other characters, and it's not entirely clear at first whether this is meant to suggest that she's ugly, that she's not pure Japanese (some mainland Asian peoples have that kind of facial structure), or that she's mentally challenged (it's also similar to the characteristic appearance of people with Down syndrome). That said, there are plenty of characters in the series that are actually ugly (most "thuggish" characters... the Yakuza, the school bullies, the bikers... tend to be ''hideous''), and Tae isn't one of them.
* MemeticMutation: In Chapter 55, a bit character makes the original Y U NO? face ([[YourHeadAsplode taken WAY out of context]]).
* MoralEventHorizon:
** Shion Izumi has done more than his fair share of [[KickTheDog dog kicking]] (just ask the '''387''' people he killed just to selfishly get himself back.) But all those 387 deaths were not as irredeemably heinous, [[TearJerker nor tragic]], as when he [[spoiler: cold-heartedly killed Tae in Volume 16.]] And while it was Gantz who assigned the mission, it was clear that one could choose ''not'' to kill her, much less in such a sudden, vile way. Rest assured though, [[spoiler: [[LaserGuidedKarma the vampires slay Izumi four volumes later]] and Tae gets revived by then.]]
** For the most part, Nishi was a JerkAss HeelFaceRevolvingDoor. He finally crosses the line, however, in Chapter 364 [[spoiler: during his final fight against Kei. While fighting him, Nishi sees Tae standing nearby. Knowing how important she is to Kei, he sports a SlasherSmile when he fires a cheap shot at her. While Tae barely hangs on, Nishi's morality points are moot judging from [[EvilLaugh his laughter]] and [[EvilGloating shameless gloating about killing Kei's girl.]]]]
** [[spoiler:The Truth crosses this big time in chapter 371.]]
--->'''[[spoiler:The Truth]]:''' Now we shall prove that human beings are merely "things..."
* NauseaFuel: Being that the show is full of {{gorn}} and visceral imagery, this is to be expected.
* {{Padding}}: There's a lot of meaningless pages of running, screaming, grunting and moaning. The series can be shortened a few volumes if you erased these parts.
* RescuedFromTheScrappyHeap: Nishi started off as an ''asshole'' who, while experienced, was constantly seen disappearing from battle and leaving much of his colleagues to die. That all changed in chapter 341 [[spoiler: where he kicks the viral monsters' asses and saves Takeshi from the explosion at the department.]]
%%** In the manga, Kei Kurono gets rescued too.
* SeasonalRot: Although the first and second phases are liked by most fans, the third and final phase is panned by readers. Reasons include its RomanticPlotTumor, {{Padding}}, [[TheyWastedAPerfectlyGoodCharacter several famous characters being ignored]] and focus on action over horror.
* SignatureScene: Nishi's ReasonYouSuckSpeech to his teammates. Gained a lot more traction after a ''VideoGame/FireEmblemThreeHouses'' video was created with the audio coming from the scene as Linhardt was voiced by Creator/ChrisPatton, who voiced Nishi in the first anime.
* {{Squick}}:
** During the Osaka arc, [[spoiler:some Osaka team members are seen raping various female demon/aliens, which is bad enough. But then you see one stuffing his hand in the ''mouth on the back of one's head''. That took it to new levels of gross-out.]] Not to mention how many times they have pointless [=ECUs=] of people's spit coming out of their mouths; not total gross-out, but it'd be nice if there was less of it.
*** The female demon/aliens being raped are a Futakuchi-onna and a Rokurokubi.
* TheyChangedItNowItSucks: When the dub of Gantz:0 was announced, the castlist revealed none of the original actors would reprise their roles. While it was inevitable for Kato’s voice actor Creator/IllichGuardiola, fans were still disappointed.
* TheyWastedAPerfectlyGoodCharacter: Host Samurai and Kill Bill from the Vampires magically disappeared from the series. They could have used CharacterDevelopment to become {{Anti Hero}}es fighting the alien invasion but there is no sign of them.
* TheyWastedAPerfectlyGoodPlot: The Vampires subplot is casually forgotten, when their involvement in the alien invasion side-by-side with the Gantz players could've been interesting.
* TooBleakStoppedCaring:
** Aside from the blood and gore everywhere and the overly gritty tone, it can be really hard to sympathize with the main characters as many of them are {{jerkass}}es at best and downright malicious at worst. Even with the series getting EarnYourHappyEnding, it still feels like a chore to read through for some.
** For a while Masaru Kato was the closest thing the series had to a BigGood, being the most idealistic and selfless of the participants. He also frequently got berated for his pacifism and was often [[GoodIsImpotent portrayed as ineffectual compared to his more ruthless peers]].
** The general citizens in ''Gantz'' are pretty [[EvilIsPetty petty]], [[TooDumbToLive idiotic]], [[DirtyCoward cowardly]], {{jerkass}}es and more than anything [[UngratefulBastard ungrateful]] and [[ExtremeDoormat prone to believe anything told to them at face value]]. It doesn't matter how many people the Gantz team saves [[HeroWithBadPublicity they're always criticized for not doing enough and they get bad rep]] at the minimum provocation. [[spoiler: This is nicely averted come the end of the series, where the ''entire planet'' weeps for Kurono's sacrifice to save them, and when he and Kato wash up on Japan's shoreline, they have a crowd of people ''sprinting'' to make it there in time to feverishly thank them.]]
*** It really goes to a whole new level during Katastrophe, after a while the Earth and the Alien Mothership have apparently signed peace, [[YankTheDogsChain only for the excommunicated Tokyo Gantz team be declared a terrorist organization almost immediately]] [[NoGoodDeedGoesUnpunished despite not killing any alien civilians and saving a multitude of people]], all that while the human slaughterhouses are still operational. Its really hard to blame Sakurai when he fucking snaps... [[MoralEventHorizon until he starts killing civilians]].
** This is even the subject of SelfDeprecation in Oku's next manga, ''Manga/{{Inuyashiki}}'', where Hiro scolds Ando for reading ''Gantz'' because of this trope (but it's also some sort of HypocriticalHumor, considering that Hiro is no better than most ''Gantz'' characters).
* ValuesDissonance: In an interview at the back of one of the volumes the interviewer asks the author if Kurono got stuck with Tae for being such an asshole in the previous chapters to which not only he answers yes but he mentions how awful of a girlfriend Tae is. Tae is nothing but sweet and loyal to Kurono and treats him better than anyone before save Kato probably, it's just that she isn't hot to be considered a good girlfriend and YMMV on that opinion.
* {{Wangst}}:
** Kato's actually strong, tolerably smart by the series' standards (which, granted, aren't all that high), and fairly effective whenever he manages to stop boo-hoo-hooing about ... well, pretty much everything ... and actually ''do'' something other than just whining about it. Which is to say, almost never, at least up through the Buddhist Temple arc.
** Kurono also falls victim to this. It's so bad, he's currently the trope page image (though ironically, it's from [[EverybodysDeadDave the one scene]] where his over-the-top angst is justified).
* TheWoobie:
** Takeshi, for officially having the worst childhood ''ever.'' The heartbreaking part? He's still a toddler.
** Also Ayumu, Kato's little brother. Both their parents die and are taken in by their aunt, who constantly abuses them. Just when they finally gathered enough money for the two to live on their own, Masaru dies and he is abandoned for more than 10 months. When Kato finally is revived, he discovers Ayumu rumming through garbage cans, implying he was surviving on his own during the time Masaru was dead.
* WriterCopOut: This seems to be the common emotion among the fanbase toward the manga's finale.
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