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- Adaptational Villainy: It's the real bad guy in the anime, where the manga's eventual plot is absent, making the hunt simply something Gantz does for its own sick amusement.
- Arson, Murder, and Jaywalking: Harbinger of death, damnation, and dirty nicknames.
- Big Bad: So it appears... at first. Played straight in the anime.
- Blue-and-Orange Morality: Assuming it has any morals, they're completely alien to anything resembling human morals.
- Cloning Blues: Since it basically copies people the moment before they are killed (or at least, not fatally injured), Hunters who think on it end up with this.
- Cosmic Plaything: This is essentially what it has in store for the people it collects.
- Crazy-Prepared: It likes to prepare for all eventualities.
- Deadpan Snarker: It's part of its trollish personality.
- Dissonant Serenity: "8 Points! Total 46 Points! 54 to Go!" After Kurono returns as the Sole Survivor of the nightmarishly intense third mission.
- From Nobody to Nightmare: According to the Room of Truth aliens, the bald man in the sphere was just a ordinary human who was cloned to operate it.
- Humanoid Abomination: It is a hairless comatose man wired inside of an indestructible black ball that carries weapons, power suits, teleportation capabilities, and poor instructions on finding and killing deadly alien invaders.
- HeelFace Turn/Good All Along: When the bald man leaves the black sphere, he turns out not to be the cruel bastard everyone assumed he was. He even tries to help the Tokyo Team during the Katastrophe arc.
- Hunting the Most Dangerous Game: Clueless humans with high-tech weaponry hunting sneaky alien invaders.
- In Love with Your Carnage: Toward the particularly Blood Knight characters.
- Jerkass: Deliberately spites, insults, and degrades the players, even when they are at their lowest.
- Killed Off for Real: You know shit has gotten real when the Giant Aliens attack the Gantz room, blowing the black ball out of the building and into the street, crushing the head of the man inside. Though there's more where that one came from.
- Knight Templar: It only cares about its goals and it will do whatever it takes to achieve them. And in the cruelest way possible, to boot.
- Lack of Empathy: Life, death, sacrifice, loss, even The End of the World as We Know It. It's all a fun game to Gantz.
- Manipulative Bastard: Seems to be part of its programming.
- Meaningful Name: Averted, no one really knows what "gantz" means. It's possibly just a slang term used to address the black ball that got around amongst the Hunters.
- Given the spheres' origins, it's likely a misspelling of the German adjective/adverb ganz ("complete" or "completely"). Still meaningless in context, though.
- Me's a Crowd: At first one Gantz seems bad. Then you find out there are thousands, if not, millions of Gantz balls on assembly lines and an endless supply of carbon copied men to "pilot" them.
- More Dakka: Gantz supplies its participants with the best in alien engineered weaponry, all of which can be incredibly destructive if used correctly.
- The Nicknamer: Gantz gives all the players nicknames based on appearance or behavior.
- Nightmare Fetishist: It picks the sickest, nastiest, most lethal aliens and monsters for the Gantz teams to kill.
- An Offer You Can't Refuse: Gantz implants bombs in the heads of those whom it recruits; if you turn it down, your head goes boom.
- Psychopathic Manchild: The fact that Gantz has the sense of humor of a twelve year old Call of Duty troll makes the fact that it sends random humans on horrifying suicide missions even scarier.
- Smug Snake: Modest it's not. Neither are the way more powerful beings that made possible its creation.
- Troll: Like no other. Disrespects and inconveniences the players at every turn, delays the firing mechanism on all of the guns, alters the rules of the game on a whim, and targets aliens that are either a) worth next to no points, or b) the least dangerous out of several that are extremely dangerous. Worst of all, it doesn't do it because of programming or anything, it just likes fucking with the poor souls it traps.
- Unwitting Pawn: As much a slave to forces beyond its control as the players it plagues. Although its powers are still near godlike and can be used to deadly effect no matter whose hand is controlling it.
- We Have Reserves: Not just the endless supply of potential Hunters, but there are literally thousands of Gantz balls in production, waiting to make life hell for humans and aliens by the score.
- Well-Intentioned Extremist: While it can't be denied that many of the creatures Gantz targets need to be stopped, the methods it uses to achieve these goals are cruel and unusual.
- You Have Outlived Your Usefulness: Gantz doesn't really play favorites. Everyone is expendable.
- Your Days Are Numbered: As part of its recruiting speech, it explicitly tells its new hunters that their lives are its to decide.
Tsuneo Nikaido, "The Nerd"
- A Day in the Limelight: A whole chapter is dedicated to him, which covers everything he went throught after his first battle, how he became the only remaining team member (the others chose to leave) and we also discover that he was also at the Italy mission, which granted him the points to revive Anzu.
- Did You Just Punch Out Cthulhu?: Using the Nurarihyon Alien's severed head to disintegrate several of monsters in its own brood.
- Fish out of Water: The Osaka Arc is his first time as a Gantz player. The only reason he survives is because he and his friend were smart enough to wear the suits, and because more than a few people take the time to save him.
- Hero-Worshipper: Towards Masaru Kato.
- Killed Off for Real: Decapitated by the God of War.
- Except not because those killed in the final fight are revived although we never see them again. Why this is suddenly possible when it'd been established that Gantz can no longer revive people is never explained.
- The Load: More often than not, until he got used to the missions.
- No Name Given: The others never refer to him by name.
- Took a Level in Badass: When he managed to survive the Italian mission with only a frightened little girl as a teammate and still earn enough points to resurrect Anzu.
- Undying Loyalty: Went out of his way to gather enough points to revive Anzu, so she can be reunited with Kato again.
- Hero-Worshipper: Like The Nerd, Anzu is so astounded by Kato's bravery that she not only joins his cause, but falls in love with him on the same night that they meet.
- Irony: Of all the Osaka members, Anzu lives possibly the most morally ambiguous normal life. While most of the Psycho for Hire types you read about earlier are shown to be mild mannered members of the workforce in their normal lives, the sweet and attractive little Camper Anzu is shown to be passively neglectful toward her son so she can focus on earning money. By illustrating porn. In her living room.
- Morality Pet: Love for her son compels her to survive. Love for Kato compels her to be heroic.
- The Oathbreaker: Dies to prevent Kato's death, even though she made him swear earlier not to die so that they and their families could all live together. They each tragically lampshade this as she is being killed.
Kendou Kobayashi (Movie) (Japanese), Doug Erholtz
- Arrogant Kung-Fu Guy: He's been taking karate lessons. Online.
- Badass Bookworm: His knowledge of strategy makes Oka a highly skilled warrior.
- Blood Knight: A subtle version.
- Combat Pragmatist: Uses the most powerful weapons and armor Gantz has to offer not to protect the weak innocent, but to increase his odds in battle despite the fact that he is plenty dangerous without all of it.
- Cruel and Unusual Death: Apparently ripped apart by Nurarihyon. We only see that he's missing everything below his chest.
- Curb-Stomp Battle: He's cleared seven missions with 100 points. At the time, it was considered next to impossible to get more than a few points each mission.
- The Ghost: Remains invisible for most of the game, letting the rest of his team eliminate the lesser aliens and draw out the greater ones so that he can collect on the points.
- Foreshadowing: All of the technology he collected as achievement awards for the missions he completed are later revealed to be Gantz's war arsenal against the Giant Aliens.
- Humongous Mecha: Pilots one when he first appears.
- Know When to Fold 'Em: It turns out that the secret to surviving a long time in Gantz is to back off when an alien is obviously too powerful for you, and just run out the clock or hope someone else kills it. Who knew? (It doesn't save him this time, because the alien is a Blood Knight who wants to keep fighting him, but it's almost certainly how he survived so long in the first place.)
- Lack of Empathy: Does not feel the least bit bad about leaving the scared and uncertain Tokyo Team to deal with the monster even he can't kill.
- Large Ham: Has his moments.
- "Despite this look, in grade school I PLAYED PING PONG!"
- Lightning Bruiser: Outside of the armor.
- Powered Armor: Oka is the first player seen wearing the Gantz version, as well as piloting its towering mechanized war machine.
- Straight Edge Evil: In the Osaka spinoffs, Oka appears to be a well-adjusted office worker by day, quiet and efficient. Though, he is clearly bored, and even more clearly exhilarated when he receives the signal for his next and last mission.
- The Worf Effect: It appears that Oka (who has already taken down a Godzilla level monster) can be the only one capable of defeating the Nurarihyon Alien that has so far eliminated three of his best teammates, dominated half of the Tokyo Team, and proven itself unkillable. Even with all his wonderful toys, this turns out to not be the case. Since both got a lot of buildup, this avertings it for the monster, but plays it straight for Oka himself.
- Worthy Opponent: Nurarihyon considers him to be something like this, claiming "he was fun" when confronted with Kaze's "predictable" martial arts. It even abandons its fight with the Tokyo Team to hunt Oka throughout Osaka, and destroys several buildings in the process of killing him.
- Laser-Guided Karma: After using his considerable abilities to violate extraterrestrial species, he loses his arms, legs, and, possibly, his genitals in his fight with The Nurarihyon Alien. Because he survived, the damage only lasted as long as the hunt itself.
- Lovable Sex Maniac: To the Osaka Team. The Tokyo Team would disagree about the "lovable" part. And the aliens would strongly disagree.
- Lack of Empathy: His reaction to The Nerd now left alone in the Osaka Team: "Oh, right. Guess you're kinda fucked next time, huh?"
- Large Ham: Very, very expressive during his rapes.
- Nightmare Fetishist: Legitimately finds the aliens he rapes to be hot, especially Nurarihyon's blob of beautiful women.
- Soft-Spoken Sadist: Kuwabara's pretty levelheaded and laid back for a guy who can slaughter one alien as he's raping another.
- White Hair, Black Heart: He's a white-haired rapist, which contrasts sharply with his civilian life as a legitimately beloved middle-school English teacher.
Nobuo "Nobu/Knob" Muroya
- The Leader: Describes himself as such, though, Oka is the most dangerous and experienced member of the team.
- Psycho for Hire: Well, sort of. In his civilian life, he has little problem working in a fast-food restraunt with his buddy Shimaki.
Voiced by: Masaki Sumitani (Movie) (Japanese), Steve Heiser (Movie) (English)
- Cruel and Unusual Death: He gets caught and consumed by Nurarihyon's form (a giant and bizarre mass of naked women). Though, it does spit out his head.
- Heterosexual Life-Partners: With Knob. They are even revealed to work together as polite fast-food workers by day.
- Pride: Seems to think he's invincible.
- Psycho for Hire: Well, sort of. In his civilian life, he has little problem with working in a fast-food restaraunt with his buddy Knob.
- Scary Black Man: Has rather dark skin and is a total ass.
Tetsuo Hara, Sanpei Taira and Susumu Kimura, the Sadist Trio
- Dirty Coward: Just as Tetsuo is given the chance to run away and live, he tries to stab the infinitely more powerful alien in the back. And fails miserably, losing his head.
- Killed Off for Real: All three die brutally. Tetsuo and Susumu are killed by the Samurai aliens, while Sanpei is cut down by Hikawa.
- Laser-Guided Karma: Given their title, the manner of their deaths, i.e. being chopped apart, was very fitting.
- Master Swordsman: Proven otherwise when they encounter a couple of aliens who actually are.
- Crouching Moron, Hidden Badass: Despite the fact that we see her do nothing but stand around and run away, she is still able to earn enough points to buy her freedom after she survives.
- Dirty Coward: Like Miho, Sumiko is perfectly fine with letting the tough guys do the work while she watches, and abandoning the fight when it looks like they will lose.
- Gag Boobs: Which her team's Gantz very much appreciates.
- Heterosexual Life-Partners: With Miho.
- Undying Loyalty: Subverted, unlike with The Nerd and Anzu. Sumiko (and Miho) finished the hunt with just over 100 points and, having lost her boyfriend, opted to erase her memories and be released from the hunt...instead of using those 100 points to revive him.
- Villainous Breakdown: When Knob, Shimaki, and Kuwabara are taken down.
- Crouching Moron, Hidden Badass: Miho is also seen doing nothing but standing, screaming, and running, and still has enough points to buy her freedom after she survives.
- Dirty Coward: Like Sumiko, Miho is perfectly fine with letting the tough guys do the work while she watches, and abandoning the fight when it looks like they will lose.
- Undying Loyalty: Subverted, unlike with The Nerd and Anzu. Miho (and Sumiko) finished the hunt with just over 100 points, but because her boyfriend Knob is dead, she opts to erase her memory and be released...instead of just using those 100 points to revive him.
- Villainous Breakdown: When her boyfriend Knob gets killed.
- Dogged Nice Guy: Towards Reika.
- Fanboy: He is ecstatic to find out Reika is also on the team and says he was a devoted fan of her during her Idol career.
- Heroic BSoD: Suffers one briefly after he finds out Reika died.
- Killed Off for Real: Seems to have happened to him when he fights Eeva Gund to defend Kei.
- Except not because those killed in the final fight are revived although we never see them again.
- Loners Are Freaks: He rarely talks to anyone, shows next to emotion, and is, overall, a very scary-looking person even though he is one of the heroes.
- OOC Is Serious Business: As he dies, Ryuuji is happy and smiling for the first time.
- Cruel and Unusual Death: Suffers one of the cruelest and most unusual deaths when he is hit by one of the Pandora's Box spores, turning him into a violent mutating mass of his own extremities, clothing, and weapons.
- Dying Moment of Awesome: Killed immediately after delivering some serious blows to the nigh-invincible Eeva Gund, including cutting off some of his fingers and letting everyone know that they can beat him.
- Killed Off for Real: Cut in half by Eeva.
- Except not because those killed in the final fight are revived although we never see them again.
- The Strategist: From time to time.
- Wham Line: "Gantz can't bring people back to life anymore. It can't heal injuries either. Nothing like that."
- Badass Bystander: Is rendered to this position when he is tasked with carrying around The Nerd when the latter's foot gets crushed.
- I Just Want to Be Badass: Seems to be his motivation besides protecting the weak.
- Killed Off for Real: Cut in two by The God of War Giant.
- Except not because those killed in the final fight are revived although we never see them again.
- Lampshade Hanging: States that he isn't very worried about the monsters he's facing, because there are "some monsters of our own" on his team.
Green Onion Aliens
- Alien Blood: Green alien blood.
- Badass Longcoat: Onion Alien's father.
- Bait-and-Switch Boss: The Onion Alien is the only one listed as a target. His father arrives right after the team kills him, and turns out to be a significantly worse threat.
- Benevolent Alien Invasion: The Onion Alien and his father don't seem to be hurting or planning to hurt anyone until the Gantz Hunters find them. Though, the father is capable of serious damage if provoked.
- The Berserker: The father after his son is brutally executed.
- Berserker Tears: A haunting villainous example.
- Lightning Bruiser: Onion Alien's father.
- Little Green Men: At first the Onion Alien appears to be a scared, odd-looking little green-skinned boy. Then his dad shows up. He is green, but he is by no means little.
- Nigh-Invulnerability: The Onion Alien's father is shot several times, hit by a car, beaten to a pulp, and ensnared in unbreakable wires, and is still standing when he is transferred away.
- Papa Wolf: The Onion Alien's father is understandably enraged when the team kills his son, and proceeds to make his anger known in great detail.
- Shoot the Dog: The son is hunted down and shot to pieces by a group of ignorant and/or violent new Gantzers. Just when it looks like the father has turned the tables on all of them, he is taken down by Nishi.
- Starfish Language: Whatever the father alien is speaking, it's nowhere near a human language. Oddly, his son can speak Japanese just fine.
- Starter Villain: Despite the terror Kurono, Kato, and Kishimoto endured during this mission, the Onion Aliens are nothing compared to what they face later.
- Super Strength: The father quite literally tears several of the team apart with his bare hands.
- Human Outside, Alien Inside: Fails at the "human outside" part so bad that they must remain invisible even in disguise.
- Innocent Aliens: Allegedly. They pay for food they take from the store while invisible and they don't attack anyone until they are provoked. However, accidentally stepping on one of their baby chick siblings is usually enough to provoke them. And if so, there are likely many innocent bystanders who stepped on them while they were invisible and got killed as a result.
- The Worf Effect: This mission proved that Anyone Can Die when Nishi, the know-it-all veteran hunter, was beaten and violently killed by the first Tanaka alien the team came across.
Buddhist Temple Aliens
- Absurdly Sharp Blade: The swords which 1000 Arms possesses are capable of cutting through flesh, bone, the Gantz suits, and even stone.
- Beware My Stinger Tail: Which allows 1000 Arms to finish off Kato even after it has been mortally wounded.
- Bling of War: All of their statue disguises can count as this, especially 1000 Arms.
- Blood Knight: Innocent or not, these aliens are talented, destructive fighters. When it can speak english, 1000 Arms is almost psychotic in its enthusiasm about beating Kato to a pulp.
- Brain Food: A couple of these aliens eat the brains of their victims.
- Break the Haughty: What this mission symbolizes for Kurono. His over-inflated ego is quickly demolished when the girl he loves is melted in front of him, he loses An Arm and a Leg, and finally he finds out that he is the mission's Sole Survivor.
- Defiant to the End: 1000 Arms kills Kato during its last moments... after it has already been decapitated
- Disc-One Final Boss: 1000 Arms is this for Kato.
- Dual Wielding: The 1000 Arms statue carries two swords.
- Energy Weapon: 1000 Arms has an ornament which can project deadly lasers.
- Foreshadowing: Kurono kills the largest statue by skyrocketing his whole body straight into its head... which is also how he ends up killing his final enemy in the series, also a giant.
- Healing Factor: 1000 Arms has one, via an ornament it possesses which seems to reverse any damage done to it so long as the ornament remains in tact.
- Hero Killer: 1000 Arms kills Kato.
- Hoist by His Own Petard: When Sei kicks the acid vial out of 1000 Arms' hand, melting half of its statue disguise and its Time Master ornament.
- Hollywood Acid: 1000 Arms makes use of acid to fight, which viciously melts Kurono's arm and leg when he gets too close while attacking it.
- Human Outside, Alien Inside: Buddhist statue outside, lizard alien inside.
- Innocent Aliens: 1000 Arms claims they never did anything to hurt humans and have no idea why they are being attacked. Since they are specifically in disguise as peaceful statues, it probably was not lying.
- Multi-Armed and Dangerous: 1000 Arms' statue disguise, and possibly all of them in their true form.
- One-Winged Angel: 1000 Arms
- Pyrrhic Victory: Kato fights to the bitter end, finally slaying 1000 Arms and rejoicing that he will get to go home to his brother. Then he's killed by the alien's final attack, seconds before he would have been sent back.
- Roaring Rampage of Revenge: 1000 Arms does not respond well to the puny humans who eradicated its companions.
- Shockwave Clap: The larger statues can do this.
- Shoot the Dog: The entire mission is one long Shoot the Dog. Becomes a literal example, when one of the statues smashes the Team Pet dog's head without any warning.
- Starter Villain: The most traumatizing starter villains yet.
- Symbiotic Possession: 1000 Arms consumes a nerdy Gantzer's brains and adopts his personality to communicate with humans. The guy realizes this, but then he begins to like how powerful he feels in the alien's body.
- The Worf Effect: Just when it looks as if Kurono has accepted his role as the series definitive badass, 1000 Arms crushes him and slowly slaughters the rest of the team.
- Alien Blood: In the video game adaptation they have purple blood.
- Arrogant Kung-Fu Guy: All of them. Except they all can back up their arrogance.
- Awesomeness by Analysis: One of their key weapons.
- "I know your fighting style. I will not fall for any of your tricks."
- Badass Boast: "First, I will defeat you. Then, I will kill you. I will never forgive you for what you have done."
- Break the Haughty: They finish what The Buddhist Temple Aliens started as far as convincing Kurono that he isn't as cool as he thinks.
- Charles Atlas Super Power: Gantz describing them as "Strong" doesn't quite cut it.
- Climax Boss: The Sole Survivor Shorty Alien ultimately winds up as this to Kurono. It ends up tacking Kurono into the real world and slaughters most of his classmates in retribution for Kurono killing his comrades. This ends up being a major catalyst towards Kurono's Character Development of legitimate heroism.
- Face Death with Dignity: The last one only stands up straight and glowers at Kurono before it explodes.
- Human Outside, Alien Inside: The last one somehow perfectly disguises itself as a student at Kurono's school, and continues to wear it even as it massacres his classmates.
- Hyper-Awareness: "I can see in to your heart." It's true in more ways than one.
- Roaring Rampage of Revenge: In the mission which they were supossed to be slain, Kurono left one alive because the time was up and he was the only hunter sent to that mission. The surviving one tracked down Kurono and killed all of his classmates (except Tae and Izumi) in retaliation.
- Super Strength: Can tear normal humans to pieces with just their hands, and are all skilled fighters.
- Sympathy for the Devil
- The Big Guy: The Kappe Alien, though it started out as a little guy.
- Elite Mooks: The Velociraptors and smaller Brachiosaurus.
- Evil Versus Evil: The T-Rexes and Triceratops' don't get along and end up fighting over who kills Izumi.
- Extra Eyes: The Horned Brachiosaurus spontaneously grows hundreds of eyes on its underbelly when Kurono tries to sneak attack it from below.
- Giant Mook: The T-Rexes and Triceratops.
- Gentle Giant Sauropod: Averted with the Brachiosaurus.
- Humanoid Aliens: The Kappe Alien.
- Intelligent Gerbil: Many are disguised as prehistoric dinosaurs, despite the fact that they can shift sizes, stand upright, develop fists, and breathe fireballs.
- Nightmare Fuel Station Attendant: The Kappe Alien looks kind of cute and harmless at first, until you realize it controls the dinosaur aliens, has Super Strength, and can turn into a hideous giant.
- Outrun the Fireball: Kurono literally has to do this when he's being chased by the T-Rexes, who shoot fireballs out of their mouths.
- Psychopathic Manchild: The Kappe Alien is very insecure, thinking it's being attacked because it is "looked down upon" by others, and retaliating by using the dinosaurs as weapons.
- Raptor Attack: The Velociraptors, of course.
- Shrinking Violet / The Berserker: The Kappe Alien is pretty timid normally, but is insatiable when pissed off.
- Sizeshifter: The angrier these aliens get, the bigger they get.
- This Is Unforgivable!: The Horned Brachiosaurus, who is apparently the mother of the other dinosaurs, reacts this way when it is the only one left.
- The Worf Effect: Just as The Kappe Alien grows to an enormous size, becoming a One-Winged Angel, it is easily cut in half from behind by Izumi.
- Would Hit a Girl: It's pretty amusing when the Kappe Alien gets jumped and beaten up by an angry shopaholic girl. Then it starts fighting back and sics its pet velociraptors on her.
- Anti-Climax: Despite their enormous size, powerful weapons, and menacing appearance, they are taken down quite easily.
- Boldly Coming: A truly horrific example when Inaba and Reika start having sex in the middle of the blood soaked mall. The real Reika shows up and the one on top of Inaba begins transforming and attacking the others while he is still inside of it.
- Demon Lords And Arch Devils: The leaders seem to be these.
- Eldritch Abomination: If they aren't aliens or demons, they are this.
- Expy: Many of their abilities make them appear reminiscent of the alien in John Carpenter's The Thing.
- Hellfire: One of the leaders uses this to kill several members of the Tokyo Team, including Sakurai.
- Horny Devils: Rape is as commonplace as murder for these guys.
- Human Aliens: They look like regular humans... at first.
- Cloud Cuckoolander/Psychopathic Manchild: Nurarihyon observes attacks made against it as if it were observing someone challenging it at chess.
- Eldritch Abomination: A whole city district full of them, led by one of the biggest ones ever.
- Evil Counterpart: The samurai alien couple to Host Samurai and Kill Bill. Or rather alien counterparts to the vampires.
- Eye Beams: Nurarihyon's are devastating. At it's most basic form it disintegrates individuals exposed to his glare for too long. When he's pissed off, the eyes blows up multiple building in just mere seconds.
- From a Single Cell: Nurarihyon's Healing Factor is off the chain. It doesn't matter how many pieces you bash it into because even the pieces are dangerous.
- Intelligent Gerbil: More than a few are these.
- Knight of Cerebus: Despite the number of atrociously difficult aliens seen throughout, Nurarihyon takes things to a whole new level of fear and hopelessness.
- Lightning Bruiser: Nurarihyon lives and breaths this trope. To give you a sense of how powerful this alien is, after he assumes his final form he incapacitates 3 members of the Tokyo Gantz team in the blink of an eye and proceeds to kill the strongest member of the Osaka Gantz team offscreen. Hell, It takes Sakata's overloaded psychic abilities to temporarily hold him back .
- Male Gaze: Whether Nurarihyon has this himself or merely shapeshifts into mutated buxom women to distract his enemies is debatable.
- Man of Wealth and Taste: Though they are bizarre monstrosities, Nurarihyon, its two powerful friends, and the samurai alien couple see themselves as this.
- Our Monsters Are Weird
- Sherlock Scan: If Nurarihyon sees and understands how an opponent is beating it, it will simply shapeshift into a form that can't be beaten in that way.
- Smug Super: Nurarihyon, and the rest take after it.
- Soft-Spoken Sadist: Nurarihyon is prone to making witty little remarks whilst shrugging off his enemies' desperate efforts to defeat him.
- "I see... mm... yes, I see... I see..."
- "Observe..." copies Oka's Gantz power armor.
- Sympathy for the Devil: Though most are violent and predatory, a few are simply defending themselves from or at the mercy of the malicious Osaka Team.
- Voluntary Shapeshifting: Nurarihyon is perhaps the most disturbing example of this trope.
- Wretched Hive: Osaka is this thanks to these aliens.
- Yōkai: A deliberate running theme with this lot.
Renaissance Statue Aliens
- World's Strongest Man: Or aliens. Hundreds, possibly thousands of Gantz teams from all over the world are sent to fight these guys. Those hundreds of thousands end up barely having any time to breathe, let alone fight back.
- The Ace: Eeva Gund, the God of War appears to be this among the Giant Alien Army...
- Broken Ace: ...But is probably this after the Giants have been defeated and his brother Oltra was killed by Kei.
- Aliens Are Bastards: See nothing wrong with sacking an entire planet, harvesting the human species for food, and televising the Gantz teams fighting for their lives like football games.
- Attack of the 50-Foot Whatever: Gigantic as their name implies.
- Bishōnen: The God of War is a bishonen giant.
- Bizarre Alien Biology: Subverted somewhat. They look very much like humans, but are gigantic in comparison, have four eyes, and the males apparently have multiple penises.
- Boom, Headshot!: How Kurono manages to finally kill the God of War.
- But for Me, It Was Tuesday: Earth is definitely not the first planet they've invaded and it shows. Though, it may be the last.
- Call-Back: This was a callback to when Kurono killed a giant Buddhist Temple alien in the same manner earlier in the series.
- Charles Atlas Super Power: They have it, and their size surely helps.
- Colony Drop: Eeva Gund threatens to do this to the whole world with the mothership if Kurono doesn't come to fight him in a duel.
- Crazy-Prepared: They come totally ready to cripple the secret countermeasures of Gantz, as well as military and governments, and devise several devious ways of putting the Hunters through hell. Not that it helps them win in the end.
- Elite Mooks: Their exploding, armored lizard minions.
- The End of the World as We Know It: What they bring about.
- Genius Bruiser: They are smart as well as strong.
- Humanoid Aliens: Despite their gigantic average size, the two extra small eyes (one in each of their head's temples) and somewhat bizarre genitals, they look very much like humans. Also, besides their appearances, their society (at least the one inside the spaceship) is almost exactly like the modern human societies in urban areas. But, ironically, most of them just see the humans as exotic animals and nothing more.
- Humongous Mecha: They have them as part of their technology.
- Jerkass: Many, though not all of them, so Always Chaotic Evil is averted.
- Killed Off for Real: Their entire population by the end of the series, bad and good.
- Lack of Empathy: To parallel humanity's own lack of empathy towards species we view as being beneath us.
- Lightning Bruiser: They're all capable of this, but The God of War especially.
- Names to Run Away from Really Fast: The strongest Giant is called the God of War by his people.
- Rape, Pillage, and Burn: What they do to most of Earth.
- The Remnant: Their numbers are severely depleted after their apparent defeat.
- To Serve Man: They collect and slaughter humans like cattle and serve them as delicacies.
- Smug Super: They're not very modest about their power.
- Sophisticated as Hell: Able to speak like this, which somewhat emphasizes their similar nature.
- Sufficiently Advanced Aliens: They're powerful and technologically advanced enough to qualify as this.
- Worthy Opponent: The God of War and Giants in general, seem to see Kurono as this.
- Alien Animals: Kurono and Tei happen upon a literal zoo full of them.
- Bizarre Alien Biology: With extra emphasis on the word "bizarre."
- Body Horror: Some of these aliens can explode into a cloud of floating light spores. When the light spores touch humans, they enter their bodies and mutate them from the inside out, appendages multiplying like tumors, turning the victims into violent freaks of nature.
- Mighty Glacier: The largest and most powerful of these aliens hovers over the battle and watches mostly. After it drops to the ground, its movements are very ponderous. However, its telekinetic powers and ability to summon an entire new brood of creepy-crawly aliens makes up for it.
Room of Truth Aliens
- Abusive Precursors: They most definitely came into being before humanity, and they aren't very kind beings to say the least.
- A Form You Are Comfortable With: Every other panel features them projecting some new random face. It can be Gandhi, one of the aliens that have been defeated, a litter of kittens, etc.
- Aliens Are Bastards: Fitting that the most powerful ones would also be the biggest bastards.
- But for Me, It Was Tuesday: Their reaction to pretty much the entire series and everything the characters have been through.
- Brown Note: When humans see them for the first time, they cry blood. However, this effect doesn't last longer and doesn't seem to be too harmful.
- Eldritch Abomination: They are insanely powerful (and in a Lovecraftian way), Powers That Be-style non-humanoid (despite the form they take) aliens.
- Expy: They seem to be a freaky combination of the aliens from Contact, the Engineers/Space Jockeys, and the Monolith.
- Good Is Not Nice: Technically, they gave humanity the means to defend itself from dangerous alien invaders. However, the information was given to the mentally challenged daughter of a ruthless German businessman, who used the Gantz technology the way seen throughout the series: enslaving resurrected humans to a sadistic artificial intelligence and pitting them against bizarre, horrifying, highly lethal creatures. The Room of Truth Aliens did not do any of this out of the kindness of their hearts, nor out of any other great concern of theirs. More likely, they just want to maintain some sort of balance in the universe, which was likely being screwed up by the world destroying Giant Aliens.
- They more or less state that they did what they did in retaliation for the Giant Aliens trying the same crap on them. Basically, "They pissed us off, so Let's You and Him Fight."
- Greater-Scope Villain: They are responsible for humanity's discovery and utilization of the Gantz technology.
- Jerkass: They don't care at all about "lesser" lifeforms, and they only helped humanity because they felt like it. If they'd wanted to, they would've simply let the Giants destroy the Earth.
- Karma Houdini: They get away with all the havoc and misery they are responsible for, because there is apparently no one powerful enough to stop them. As they created the technology used by Gantz and the Hunters, and the fact they can make people explode if angered, it would be impossible to fight them.
- Kick the Dog: When they resurrect Kishimoto, Sei, Suzuki, and Reika and then immediately destroy them just to prove to Clone!Kei that human life has no value. They later kill him when he attacks them, horrifying Masaru and outright making him cry.
- Lack of Empathy: They tell the disheartened, battle-scarred Gantz Hunters that humans are no different from ants and that everything they do is totally meaningless.
- Lovecraftian Superpower: It seems that every power of theirs is this kind of power.
- Ludicrous Gibs: Their favorite method of execution as Clone!Kei found out personally.
- Mr. Exposition: Their sole purpose in the story is to wrap up the loose ends, mainly concerning the origins of Gantz and the reason why the Giant Aliens attacked Earth.
- Nay-Theist: They outright say that God doesn't exist, and though they acknowledge the existence of souls, they don't see anything special about it.
- The Omniscient: Their knowledge doesn't seem to have bounds.
- Physical God: Powerful enough to be considered this.
- The Powers That Be: A bad version of this. They pull the strings.
- "The Reason You Suck" Speech: They deliver a cold one to humanity as a whole. Even Masaru is left in tears.
- Straw Nihilist: They make it their goal to prove that human life has no real value when they Kick the Dog, and justify it through being omniscient.
- Sufficiently Advanced Alien: Perhaps the most sufficiently advanced aliens in the universe.
- Ambiguously Human: Their origin is not explained, except for the fact that it was something to do with nano-machines. The fact that they see the Gantz's hunter as enemies indicates that these machines may have alien origin.
- The Anticipator: Downplayed. They have technology which allow them to see the Gantz's hunters even when they are invisible, it doesn't change the fact they are caught by surprise a few times.
- Daywalking Vampire: It's not the sunlight that is lethal to them, so they have some appearences during daytime.
- Left Hanging: Not much about them is explained, even through they are the antagonists of an arc.
- Our Vampires Are Different: They gain vampirism through an infection with nano-machines which creates a strange sing in their backs, sunlight doesn't affect them but artificial light does and there's no mention of they needing to drink blood to survive, although some vampires are shown found of cannibalism.
- Sharp-Dressed Man: All of them wear suits.
- Treasure Chest Cavity: They can store pistols and even katanas in a hole in the palm of their hands.
- Villain Decay: They stop being a treat after the Nurarihyon Mission and are almost completely forgetten during the Katastrophe arc. Justified considering that both Izumi and Kei Kurono killed a lot of them and Host Samurai and Kill Bill are probably the last of their kind.
- Authority Equals Asskicking: While it isn't clear if he is the leader of the vampires, he is definitely the most badass and has seniority because of it.
- Badass in a Nice Suit: He's practically invincible on the battlefield. And, a well dressed one. He wears a black suit and tie.
- Combat Pragmatist: He has no problem with fighting dirty if it means winning a fight.
- Embarrassing Nickname: "Host Samurai" is how Gantz refers to him, which "Kill Bill" finds amusing.
- Evil Is Petty: Acts this way, but not quite. It seems like killing The Hunters started out as business to him, then it became personal, but after he ends up a member of the Tokyo Team and witnesses what they have to go through from their perspective, he loses interest in wiping them out.
- Hero Killer: Kills Izumi, the series definitive Anti-Hero, and Kei, The Hero. Kei got better, and also a clone.
- Katanas Are Just Better: His main weapon, it's also surprisingly sharp. He beheads Kei with it.
- Lack of Empathy: Though how much he lacks is debatable.
- Last of His Kind: Seems he and Kill Bill are the only vampires left alive after their massive battles with Izumi and Kurono. In Tokyo, at least.
- Lean and Mean: He's quite thin, but very strong.
- Lightning Bruiser: He hits hard, moves quickly and dodges most attacks.
- Master Swordsman: Possibly THE Master Swordsman.
- Noble Demon: He displays some sense of honor regarding his comerades. He also cares for Chiaki far more than he lets on.
- Our Vampires Are Different
- Pet the Dog: When she is mortally wounded, Host Samurai defends "Kill Bill" and carries her on his back to safety, despite claiming to feel nothing for her.
- An Arm and a Leg: Gets her sword arm sliced off during the Osaka mission. She survives and gets it back.
- Embarrassing Nickname: Either because she is a female wielding a katana or because she vaguely resembles Go-Go Yubari from the movie. Or both.
- Out-of-Character Moment: Hikawa is astonished to hear her giggle at the nickname Kei gave to him.
- Not So Stoic: Has very human thoughts and emotions. For example, when Host Samurai incredulously asks if he just heard her laugh, she appears embarrassed and claims she didn't.
- Recruiting the Criminal: Gantz recruits her and Hikawa after they enter his room.
- Start of Darkness: As a human, she and her friends were led to a club by handsome men in black clothes. These men were vampires who killed her friends and turned her into one of them.
Kei's younger brother.
- Aloof Big Brother: Thinks of Kei as this, despite the fact that he is the younger brother and far more aloof.
- Annoying Younger Sibling: Averted. Akira is conventionally successful in life as opposed to his older brother. Kei finds this fact annoying in its own way at times.
- Badass Longcoat: Before and after he becomes a vampire.
- Big Little Brother: Is taller, smarter, more handsome, more confident, and more popular than his older brother Kei. It even leads some to believe he is the older brother.
- Redemption Equals Death: He warns Kei that the vampires are coming for him, putting his own life in danger. A few panels later Host Samurai is holding his head in the air for Kei to see.
- Smug Snake: Makes sense when he turns out to be a vampire as well. Even when he warns his brother of his impending death Akira appears only vaguely interested.