Characters / One-Punch Man: Villains & Monsters

One-Punch Man Main Character Index
Saitama | Hero Association (S-Class Heroes) | Neo Heroes | Villains and Monsters (Garou | Monster Association) | Others

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Beware of spoilers. Spoiler Policy forbids the use of spoiler tags in the pre-examples description, or to hide trope names.

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Individual Villains

Speed-o'-Sound Sonic

Sonic

Voiced by: Yūki Kaji (Japanese), Erik Kimerer (English), Rick Loera (Latin American Spanish)

A ninja with superhuman speed who works as a freelance assassin. After a humiliating defeat by Saitama, Sonic declares himself his unofficial nemesis and hounds him for the opportunity to claim his revenge.

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• Affably Evil: In the third OVA when he gets A Day in the Limelight. When he's off the job he's an all-around decent guy.
• Amusing Injuries: The first time he fights Saitama, he's defeated via a Groin Attack. In their second fight Saitama smashes his face into the ground so hard that in the extra page it's shown that it left an imprint in the concrete. In a special chapter, later on, Saitama defeats him with another Groin Attack, this time accidentally elbowing him in the groin.
• Anti-Villain: Primarily an antagonist but he's just as likely to fight a human villain or a mysterious being if it serves his best interests. More so in the third OVA where he's portrayed sympathetically and aptly described as "complicated".
• Arc Villain: Of the Paradise Group and National Superhero Registry Arcs. Later he returns again in the Blizzard Group Arc to once again battle Saitama.
• Arch-Nemesis: The closest the series has for Saitama, though obviously he doesn't exactly care about it.
• Assassin Outclassin': He's a Professional Killer, and his primary target is Saitama. While he was never actually hired to kill Saitama, in their first encounter Sonic mistook him for a Paradiser, who he was tasked with disposing of.
• Ax-Crazy: At times. When Sonic recognizes an opponent as his rival, he does whatever he can to initiate the battle, such as causing massive property damage and endangering the surrounding citizens in order to get Saitama to fight him.
• Back-to-Back Badasses: With Flashy Flash, when a group of ninja graduates gangs upon them. They were classmates once and sparred together, so their teamwork is flawless despite the years of separation and they dispatch the ninjas without much difficulty.
• Big Bad Wannabe: Poor guy works so hard to be Saitama's ultimate rival and Arch-Enemy, but not only is he nowhere near his level even when the latter is being completely casual, he is still greatly overshadowed by many other fighters in the series, including villains from the deep sea, the Monster Association, the Hero Hunter, and even other antagonists from the Ninja Village. Oh, and he tried to become the ultimate monster by cooking a Monster Cell instead of eating it raw. All he got out of that was a terrible stomachache.
• Blood Knight: He's positively thrilled when he comes across an opponent who can actually be a challenge; he immediately realizes that Saitama isn't his target, but doesn't care as long as he gets to fight someone that powerful.
• Butt-Monkey: While he is a competent assassin, nothing ever goes right for him when it comes to his quest to defeat Saitama.
• Card-Carrying Villain: Declares himself as one during his second encounter with Saitama in order to goad the latter into fighting him. This works much better than expected, as Saitama was in the middle of searching for a villain to defeat in order to prevent him from losing his hero status due to inactivity.
• The Chew Toy: A Running Gag for Sonic is that with every confrontation with Saitama, he is beaten in a humiliating way. First time was being punched in the groin, second time was being karate chopped on the head from behind and slamming into the concrete making a mark where he landed, the third time saw his ultimate technique completely outclassed by Saitama's Serious Side-To-Side Jumps, the fourth time (in a special chapter) Saitama elbowed him in the groin while his vision was impaired and the fifth time he stepped in some dog poop, causing him to slip and get hit by his own exploding shuriken.
• Close-Call Haircut: During his fight with Genos, Sonic's hair was cut short by the former. It also counts as a Traumatic Haircut, as said haircut pissed him off.
• Clothing Damage: Gets his clothes torn in almost every fight he's in.
• Curb-Stomp Battle: No points for guessing who wins in his fights against Saitama.
• Dark and Troubled Past: Sonic originated from the Ninja village, a hellish place where orphans were trained to become efficient killing tools. A "day" there consists of 72 hours with only 6 to sleep, food are deliberately made tasteless, outside contacts are cut off, communication is prohibited, and all the trainees are drugged so that they can't kill themselves. Despite all this, young Sonic managed to hold onto humanity, secretly befriended Flashy Flash and told Flash about his dream to abolish the system and rehabilitate his peers for a better life. However Flash believed they couldn't be saved by anything but death and betrayed the plan at the last moment. Flash attempted to mercy kill Sonic by poisoning him the night before, then proceeded to slaughter everyone at the graduation exam. Sonic didn't die from the poison due to his strong immune system and ended up being sole survivor of the class.
• A Day in the Limelight: The third OVA is centered around his training after Saitama defeats him for the first time. Few omakes also focus on him.
• Deliberate Under-Performance: Sonic's Training from Hell punished the weakest students by submitting to the harshest training. However, he reveals to Flashy Flash that he deliberately slacked off in order to get a more challenging training and was kind enough to look out for him. Ironically, Flashy Flash had been doing the same.
• Department of Redundancy Department: His name. Lampshaded by Genos. It later turns out that this is the standard naming procedure in the Village.
• Detrimental Determination: The man simply will not give up on his quest to defeat Saitama. He knows when to quit and come back later, but that's about it. He is even willing to transform himself into a monster by eating a Monster Cell if meant gaining more power to beat Saitama. Unfortunately for him, Gale Wind and Hellfire Flame fail to mention that he needed to eat the Monster Cell raw, but since Sonic cooked it, the Monster Cell was rendered inactive and he only got an upset stomach.
• Even Evil Has Standards: He is shown to be rather disgusted with the hero industry upon seeing that Neo Heroes recruited A, whom he knows as an hedonistic homocidal maniac, as one of their members. Outright calling them even more rotten than the underworld. Makes sense, as Sonic is a rather affable person, that doesn't cause trouble unless Saitama is involved.
• Exposed to the Elements: Sonic slips out of his clothes to escape the Deep Sea King's grasp. Being exposed to the rain in this state doesn't appear to bother him in the slightest.
• Failure Is the Only Option: Given how nigh-unbeatable Saitama is, it's pretty safe to say that Sonic will never ever defeat him no matter how hard he try. So much so that even Sonic occasionally doubt himself about it, but simply refuse to give up.
  Sonic: Why is it that when I face you, I feel as if I'm doomed to lose every time? Until I wipe away this hang up by beating you, I will never break through my limits!
• Flash Step: He can do this thanks to his super speed.
• Fragile Speedster: He's incredibly fast, but his physical strength leaves something to be desired. He usually compensates by using ninja weaponry and attacking the enemy's weak spots like the face or neck, but sometimes that's still not enough. In his duels against the Sea King and Genos, Sonic runs circles around his opponent, but he just can't hit hard enough to deal even Scratch Damage, which speaks volumes since Genos is a Glass Cannon who tends to lose his limbs when he gets hit. He possibly gets over this later when he managed to tank Brawny Muscle's attack, the ninja known as physically strongest, unscathed and kill him with only a single elbow.
• Full-Frontal Assault: Being forced to take off his clothes to escape a monster doesn't seem to faze him. Genos thinks he's weird.
• Giving Them the Strip: When the Sea King tries to crush him in his fist, he abandons all of his clothes in a last ditch effort to escape.
• Groin Attack: Accidentally runs his crotch directly into Saitama's fist in their first encounter. In the anime, they break out a We Are Experiencing Technical Difficulties card to cover his horrific scream. Saitama accidentally hit him in the groin again in an Omake.
• Highly-Visible Ninja: While he is capable of stealth, he always announces his presence to his opponents, particularly to Saitama. He gets away with it because he's fast enough that he can kill most enemies before they realize what's happening.
• Jade-Colored Glasses: There was a time when Sonic was actually a relatively kind boy. He partnered with Flashy Flash and was kind enough to help the seemingly weaker student, and also dreamt of destroying the ninja village and free the orphans. Flashy Flash did that for him while he was sick and since then he's become a mere mercenary looking to get stronger.
• Jerk with a Heart of Gold: In the third OVA, he helps a baby boar by killing a giant snake that tries to eat it and befriends an old man named Frank. He even goes and names the baby boar "Ino", spends the rest of the episode with it in his training, and gives some advice to Frank to help the old man defeat his arch-enemy.
• Long-Haired Pretty Boy: Until his hair was cut short, but remains a bishie.
• Mr. Fanservice: Murata puts a lot of effort into showing just how tight his suit is.
• Mythology Gag: As a side note, this character also appears in one of ONE's other series, Makai No Ossan (Old Man Of The Underworld), as a flasher who startles people at random in school. This joke is referenced during Genos' first encounter with Sonic during the Sea King story arc.
• Ninja: Of course! He was raised as one. As an experienced ninja, it can be assumed that Sonic is a master of ninjutsu and has knowledge of various deadly techniques. He's displayed multiple techniques involving his incredible speed and weapons.
• Off with His Head!: How he deals with anyone he attacks.
• Overshadowed by Awesome: The series makes it clear that, despite his obsession with the nigh-unbeatable Saitama, Sonic is possibly one of the most dangerous human characters in the series, to the point Fubuki herself notes that he could easily be on par with S-Class heroes if he ever tried. He just picked the exact wrong person to see as a rival. Notably, his power and speed, after much training throughout the series is shown to be on equal footing with a casual Flashy Flash, his friend and rival from the Ninja Village and an S-Class Hero in his own right.
• Put on the Bus: Every now and then, he gets less focus in the story then usual but he still remains a returning villain. But he's is very Out of Focus in Monster Assocation Arc, in the manga version specifically he pretty much dissapears for almost hundred of chapters, which is about 5 years in real life.
• The Rival:
  • Sonic is Saitama's self-proclaimed rival and recurring enemy, even though Saitama is way above his weight class.
  • He has a more traditional and balanced rivalry with Flashy Flash, who underwent the same hellish training in the Ninja Village Sonic did.
• Scarf Of Ass Kicking: Until his fight with Genos.
• Slasher Smile: He gets a "child-like smile" on his face when he faces a strong opponent like Saitama. He describes it as a bad habit.
• Smug Super: He will always boast about how untouchable he is because of his Super-Speed to his opponents.
• The Speedster: Speed-o'-Sound Sonic prides himself on being super fast and is arguably the fastest character save for Saitama himself. Sonic is said to be capable of reaching hypersonic speeds of at least Mach 5.
• Stalker without a Crush: Becomes obsessed with defeating Saitama after being curbstomped by him twice. In his own words, he can't overcome the feeling of being a loser unless he beats Saitama. Unfortunately for him...
• Stock Shōnen Rival: He's probably the closest Saitama gets to one, though much like the satirical nature of the series he also has deconstructed traits. Like most rivals, Sonic views Saitama as a Worthy Opponent and is obsessed with defeating him, while also being a Smug Super in his own right. Unlike most rivals, he's for the most an Unknown Rival to Saitama, who doesn't even consider Sonic worth his time. In addition, the power gap between him and Saitama (like most characters) is phenomenal and Sonic never remotely comes close to closing the gap. Though Saitama does keep letting Sonic go in the hopes that Sonic can grow stronger and one day pose a threat to him.
• Super-Speed: Sonic's main ability is his extreme speed. He has been shown to be capable of dodging rocks and trees thrown at him with incredible force. Sonic presumably obtained this from his Training from Hell at the ninja village, and only Saitama, the monsterized ninjas, and Flashy Flash have been able to keep up with him.
• To Know Him, I Must Become Him: In one of audibooks, he spends a whole day as Saitama to understand the source of his strength.
• Time to Unlock More True Potential: You've got to hand it to him, he trains really hard to try and give Saitama a challenge. Not that it helps, mind, but still he goes off to train and get more abilities after almost every defeat. And then when he decides Hard Work Hardly Works and to just eat a Monster Cell? He cooks it first thinking it'd just be common sense, and winds up just having really bad diarrhea instead.
• Unknown Rival: Although he declares himself to be Saitama's rival, the difference in strength is obvious and Saitama even has a difficult time remembering his name (he calls him "Cross of Bones Panic"). Sonic's persistence and constant attacks on Saitama eventually payed off as Saitama is capable of remembering his name in the Blizzard Group arc.
• Used to Be a Sweet Kid: He hated how the Ninja Village was turning kids into brutal killers and wanted to work with Flashy Flash to bring them down from the inside. But after Flash killed all the staff by himself, Sonic went on to become a criminal anyway.
• Villain Respect: While Sonic can't stand the fact that he keeps losing to Saitama and trains hard to defeat him, Sonic is one of the few individuals that takes Saitama and his power seriously.
• Vocal Dissonance: Virtually the only way someone can tell his gender without being told is his surprisingly deep voice. Downplayed a bit in the Latin American Spanish dub, since he speaks with a somewhat effeminate tone, except when he's screaming.
• When He Smiles: Not his slasher one. The OVA shows him smiling and it is pretty nice.
• Wild Card: Due to being an assassin for hire and having no status as a member of the Hero Association.
• Worf Had the Flu: His fight with Sea King; he's unarmed, having just broken out of prison, and while even a fully powered Sea King still can't match Sonic in speed, Sonic can't land any blows powerful enough to hurt him. Sonic runs away, and after arming up comes back, but by then Sea King's pissed off Saitama. According to Word of God, if Sonic had a weapon, he would have defeated Sea King in his base form.
• Worthy Opponent: He sees Saitama as this and won't rest until he defeats Saitama. On the flip side, while Saitama doesn't see Speed-o'-sound Sonic as a threat, he keeps letting him go so that Sonic can grow stronger and maybe pose something of a challenge next time. This is even lampshaded in the third special comic chapter "Catch and Smash". Later on, Flashy Flash notes that Saitama actually refers to Sonic by name, which is a level of recognition Saitama doesn't give to most people.

Garou

The main villain in Human Monster Saga.

See his entry on his page.

Crablante

Crablante

Voiced by: Yasutoshi Tokumoto (Japanese), Tom Fahn (English), Alan Prieto (Latin American Spanish)

Debut: Chapter 2 (Webcomic and Manga), Episode 1 (Anime)

Disaster Level: Tiger

ESTIMATED DISASTER LEVEL: TIGER

A man who became a monster from eating too much crab, and who wouldn't hesitate to kill kids making fun of him. He was the first kill of Saitama's hobbyistic heroism.

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• Alien Blood: His blood seems to be yellow along with the rest of his organs as shown when Saitama rips his eye out. Ironically though, crab blood is translucent blue in real life.
• Attack Its Weak Point: The carapace may be tough, but those eyes on stalks are convenient weak spots.
• Ax-Crazy: It's pretty obvious that this crab monster is utterly violent and insane as he's willing to murder a child just for making fun of him and mentions casually how he's killed people for less.
• Disproportionate Retribution: The big-chinned child drew nipples on his shell with a magic marker. His reaction is trying to hunt down and kill the kid. The same thing happens to anyone who even off-handedly comments on his appearance.
• Evil Is Petty: Primarily attacks people who make fun of his appearance or otherwise inconvenience him, no matter how slightly.
• Eye Scream: Saitama tears off his eyestalk... and the entirety of his insides with it.
• Giant Enemy Crab: A gigantic humanoid crustacean and Saitama's first real foe.
• Ludicrous Gibs: After Saitama tears off his eye, all the crab meat inside starts rocketing out like a firehose, covering the area.
• Moral Event Horizon: Invoked. Saitama initially wants to try and redeem him, but Crablante says that it's too late for that, since he already killed a bunch of people on the way over.
• Pet the Dog: He was willing to spare Saitama since his "lifeless eyes" reminded Crablante of his own.
• Signature Laugh: "Buuu-ku-ku-ku-ku!" The dub gives him a Mr. Krabs-like laugh.
• Small Role, Big Impact: He's a completely forgettable monster of the week (at least In-Universe) who appears for just a single scene before getting killed - but the fight against him both set Saitama on his path to becoming a hero, and was the incident that led to the Hero Association's creation.
• Starter Villain: The very first monster Saitama fights, in-universe, before his training^note except for the piggybank monster from a bonus story that he miserably failed to fight when in school — and the one who causes him to start training in the first place. Also relatively quite easy to kill.
• Superhero Origin: Parodied, Crablante turned into what he is simply by eating too much crab meat.
• Super-Strength: He is powerful enough to shatter the earth with his claws, and easily beats around Saitama as he was nowhere near as strong as he is now.
• Tattoo Sharpie: Crablante had nipples drawn on him by a kid using a permanent marker. Crablante notes that the marker could be scrubbed off, but as he has two giant crab pincers for arms, he can't possibly clean it off himself.
• Would Hurt a Child: He attempts to murder a little boy for the crime of drawing nipples on Crablante's chest with a sharpie pen.

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Vaccine Man

Vaccine Man

Voiced by: Ryūsei Nakao (Japanese), Christopher Sabat (English), Marcos Patiño (Latin American Spanish)

Debut: Chapter 1 (Webcomic and Manga), Episode 1 (Anime)

Disaster Level: Dragon

ESTIMATED DISASTER LEVEL: DRAGON

A being which sought to stop pollution and wipe out humanity for the sake of Mother Nature. He is the first enemy we see Saitama effortlessly obliterate, establishing just how overpowered Saitama really is.

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• Alien Blood: His blood is dark green.
• Barbie Doll Anatomy: Completely naked but possesses no attributes.
• Blue Is Heroic: Considerably averted.
• Captain Ersatz:
  • A parody of Baikinman, due to Saitama being based on Anpanman. He is also voiced by Ryusei Nakao, just like Baikinman.^note He doesn't use his distinctive "Baikinman" voice though. Presumably there is a fine line between parody/homage and outright duplication.
  • He also looks like Piccolo from Dragon Ball Z, so naturally he ended up voiced by Christopher Sabat in the English dub.
• Gaia's Vengeance: He considers himself to be an incarnation of nature's wrath, sent to wipe out humanity, which he thinks is an infection, as well as a vaccine to protect Earth against future infections. This is parodied overall; many old-school Japanese hero shows have similar villains, almost all of which are designed to teach the viewers and/or the characters a Green Aesop. However, Vaccine Man is immediately OHKO-ed by Saitama upon his introduction, and nobody learns anything from him.
• Having a Blast: One of his powers is to create energy balls that can explode entire city blocks.
• Kill All Humans: His solution to save the planet.
• Killed Mid-Sentence: Twenty words isn't nearly enough to tell a non-half-assed backstory adequately before Saitama gets bored.
• Large Ham: Before he's killed by Saitama, he makes a big entrance and declares his Evil Plan in a grand and showy manner.
• Ludicrous Gibs: His final fate is having his guts splattered all over the city he just destroyed.
• One-Winged Angel: He starts bulking up to a monstrous degree in order to fight Saitama. Not that it helps.
• Person of Mass Destruction: Destroys a city in his first (and only) appearance.
• Sizeshifter: Is able to increase the size of his body.
• Starter Villain: He's the first monster shown to be fought by Saitama and simply exists to show how overpowered he is. Unusually for the trope, he is one of the more powerful villains of the series.
• We Hardly Knew Ye: Dies within a few panels of being introduced in order to show the premise of the series.
• Would Hurt a Child: It's a given since he really wants to Kill All Humans, so he'll spare nobody. After destroying most of a city and killing countless people as a result, he walks up to a little girl who survived and tried to crush her with his bare hand (fortunately Saitama came to her rescue).
• You Have GOT to Be Kidding Me!: Doubles as Lampshade Hanging.
  Vaccine Man: You're a fast one. Who are you?
  Saitama: Just a guy who's a hero for fun.
  Vaccine Man: FOR FUN?! You're kidding. What kind of half-assed backstory is that?! Mine is far superior!

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Brain and Brawn Brothers

Oldface & Beefcake

Voiced by: Takuma Suzuki (Oldface) and Shinya Hamzoe (Beefcake) (Japanese), Kirk Thornton (Oldface) and Bryce Papenbrook (Beefcake)(English), Miguel Angel Leal (Oldface) and Adrián Fogarty (Beefcake) (Latin American Spanish)

Debut: Chapter 1 (Webcomic and Manga), Episode 1 (Anime)

Disaster Level: Dragon

A pair of brothers. Oldface is a mad scientist who developed a super steroid called Biceps Brachii King, while Beefcake is a body builder whom the formula mutates into a colossal giant.

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• Adaptational Attractiveness: In the webcomic, Oldface has a look of a man in in 40s, with his face resembling a caricature from animated movie. In manga, despite his wrinkled face, he looks much younger, in his late 20s.
• Adaptational Badass: Although Beefcake is always an absolute giant, he is much larger in the anime, where his footprints are kilometers long and span several city blocks in both length and width.
• Astonishingly Appropriate Appearance: Coupled with Meaningful Name: Oldface has a prematurely wrinkled face, and Beefcake is a musclehead.
• Attack of the 50-Foot Whatever: Beefcake gains a truly terrifying size. Skyscrapers only go up to his ankle.
• Ax-Crazy: At least seems to be the case with Oldface, who's shown laughing psychotically at the thought of thousands dying at his brother's hands.
• Barbie Doll Anatomy: Averted. Saitama demands Beefcake put on some pants, though nothing is shown to the audience thanks to literal clouds being used as Censor Steam.
• Big Guy, Little Guy: Before and especially after Beefcake's transformation.
• Big Little Brother: Beefcake was already the bigger of the two pre-transformation. Needless to say he is afterwards.
• Black Comedy: Oldface tells his brother to kill the guy on his shoulder. Beefcake does as he is told... but goes for the wrong shoulder, the one his brother is on, causing his brother to get reduced to bloody mush to the despair of Beefcake.
• Brains and Brawn: Literally the name of their team.
• Captain Ersatz: Beefcake is one to the Colossal Titan. The English dub even has him voiced by Eren Jaeger's voice actor.
• Drunk with Power: Both Oldface and Beefcake relish in the destruction they are now capable of. Oldface cackles psychotically at the thought of thousands dying at Beefcake's hand, while Beefcake is overjoyed at finally achieving his dream of being the strongest in the world, or so he thought.
• Dub Name Change: Sometimes Beefcake is translated as simply "Marugori" and Oldface is "Fukegao".
• Dumb Muscle: Beefcake accidentally kills his own brother just because he tried to smash Saitama... who was on his other shoulder.
• Exact Words: Oldface, while on Beefcake's right shoulder, commands Beefcake to kill Saitama who is on his left shoulder. However Oldface ordered him to "kill the man on your shoulder!" So Beefcake kills him by accidentally slapping the wrong shoulder.
• Evil Is Bigger: Beefcake is around 270 metres (890 foot) and he callously destroys many buildings.
• Mad Scientist: Oldface makes a Super Serum that turned his brother into a stupid and super strong giant, so they cause destruction.
• Magic Pants: Averted. Beefcake's transformation destroyed all his clothes, pants included, Instead Censor Steam is used to cover his private parts.
• Meaningful Name: Oldface has a prematurely wrinkled face, and Beefcake is a musclehead. Downplayed in manga, where Oldface doesn't look that old.
• "Not So Different" Remark: Saitama understood exactly how Beefcake felt, being the strongest in the world feels utterly meaningless.
• Person of Mass Destruction: Beefcake. He can sweep multiple city blocks clean with a literal wave of his hand.
• Roaring Rampage of Revenge: Beefcake goes on one after accidentally killing Oldface and blaming it on Saitama.
• Sibling Team: The Brain and Brawn brothers.
• Super Serum: Oldface makes one that turns Beefcake into an immensely giant man.
• Sympathy for the Devil: When Beefcake accidentally kills his brother and sees his strength as a curse, Saitama says he knows how he felt... before killing Beefcake with one punch.
• Unskilled, but Strong: Beefcake relies solely on his brute strength and has no technique to his fighting, much like Saitama.

Kombu Infinity

Kombu Infinity

Voiced by: Ariumi Naito (Japanese), Tara Sands (English), Marisol Romero (Latin American Spanish)

Debut: Chapter 20 (Manga), Episode 6 (Anime)

Disaster Level: Tiger

ESTIMATED DISASTER LEVEL: TIGER

A seaweed-haired monster roaming about Z-City.

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• Ambiguous Gender: On The Other Wiki, they aren't referred as a he or a she and have a very androgynous appearance and voice, assuming gender can be applied to them at all.
• Affably Evil: Is rather chirpy and bordering on Friendly Enemy-levels of attitude, even in combat. They even regard Spring Moustache as a Worthy Opponent.
• Alas, Poor Villain: In the manga at least, we get a shot of them weeping woefully on the ground after Saitama ripped off all of their kombu and used it for soup stock. Though considering what Saitama does to most monsters that incur his wrath, they got off pretty easy.
• Arc Villain: Of the Rumored Monster Arc, a manga original.
• Foreshadowing: The reason why they showed up to neighborhood was because of the rumor about monster gathering in the Z-City, only being proven to false. Later in the story it's eventually revealed that such thing exists, and it's the Monster Association, although it's not confirmed wether the monster was talking specifically about them.
• Killer Rabbit: You wouldn't expect a seaweed-hair monster to be a threat capable of hospitalizing two high-ranking A-Class heroes without difficulty, but it is and it does.
• Irony: He came to Saitama's neighborhood looking for a legendary monster rumored to live there. No guesses needed to figure out who the "monster" is.
• Not Quite Dead: The manga reveals that Saitama tore off their kombu without actually killing them.
• Offscreen Moment of Awesome: We don't get to see how Saitama deals with it. But it involved breaking a building in two.
• Prehensile Hair: Well, technically it's not hair but it sure fills this role.
• Worthy Opponent: Considering that they are in awe after Spring Moustache defends against their attacks with little difficulty, it's easy to tell they view him as this.

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Deep Sea King

Deep Sea King

Voiced by: Rikiya Koyama (Japanese), Keith Silverstein (English), Carlos del Campo (Latin American Spanish)

Debut: Chapter 24 (Webcomic), Chapter 23 (Manga), Episode 7 (Anime)

Disaster Level: Demon

ESTIMATED DISASTER LEVEL: DEMON

Click ^here to see his hydrated form.

The leader of the Seafolk and the first monster to have his own arc. He seeks to slaughter the humans and control the surface world.

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• Acid Attack: He can spit out globs of powerfully corrosive acid.
• Alien Blood: He bleeds blue.
• Arc Villain: Of the Sea Monster Arc.
• Asskicking Leads to Leadership: He's the leader of the Sea Folk and by far their strongest member.
• Ax-Crazy: He delights in murder. So much so that he broke into a shelter full of civilians hiding from him, just so he could kill them all.
• Battle in the Rain: For once, it serves a purpose other than just being dramatic: the rain actually increases the Sea King's power significantly.
• Cool Crown: Goes with being King.
• Combat Pragmatist: Outmatched? Target an Innocent Bystander, a little girl no less, instead of the hero and force them to take the acid glob.
• Ear Fins: Large fins on either side of his face.
• Elemental Absorption: Water. While he can survive out of water for extended periods of time, he shrivels into a smaller, albeit still formidable, form. Being exposed to water allows him to hulk out into his true form, which is enormous and far more powerful.
• Expy: His speed'o, narcissism, being the lord of a race of Fish-People and his contempt for surface-dwelling humans make him the Shonen-answer to The Sub-Mariner from Marvel Comics.
• Hate Sink: He is an egomaniac who sees himself as superior to everyone else and lives to murder people weaker than himself.
• Healing Factor: While shown to be highly resistant to attacks, the Sea King is capable of recovering from his injuries at an extreme rate, as seen when an injury he received from Genos, an S-Class hero, healed while they were still fighting.
• I Am Not Left-Handed: After curb-stomping Puri-Puri Prisoner in a fight, he reveals that he had been fighting in a weakened dehydrated form the entire time.
• Knight of Cerebus: Deep Sea King's episode is consistently darker than anything before or since in an otherwise lighthearted series, personally managing to defeat every single hero that has enough confidence to face him, in which 2 of them are low-ranked S-Class heroes. He instills a greater sense of dread within the narrative by showing just how dangerous attacks by monsters are for people who aren't Saitama. That is until Saitama finally decides to face him...
• Lightning Bruiser: Strong enough to curb-stomp Puri-Puri-Prisoner and fast enough to keep with Sonic's speed.
• Macho Camp: ...Maybe. Has a style of speech that is unmistakably stereotypical camp. It's also why his 'dehydrated' form has hearts for nipples. Also a weird example of Adaptational Sexuality, as because it's only hinted at through his style of speech and not any kind of content or actions, this aspect of him is difficult to translate (eg: fan translations). Thus, while their fight is obviously an Expy Mirror Match in Japanese, and gives slightly more weight to Puri-Puri-Prisoner's having taken his advice, this aspect is completely lost on foreign audiences. ^note For the record, aside from tossing around '-chan' more than would be normally appropriate, the same thing happens with Puri-Puri-Prisoner's dialogue
• No Celebrities Were Harmed: Keith Silverstein does a pretty good Tim Curry impression for the English version.
• One-Winged Angel: His more humanoid form is the result of him spending an extended period of time out of the water and dehydrating. The rain (and the water in general) allows him to return to his much stronger original form.
• Overly-Long Tongue: ...with mouth. He describes it as a moray eel, and given that he can still talk after Sonic slams his mouth shut and cuts most of it off, it might not be his actual tongue.
• Rapid-Fire Fisticuffs: He seems to have a preference for combo attacks, attacking his opponents mostly with a barrage of punches.
• Requisite Royal Regalia: Wears a regal crown and an ermine cape, but strangely very little else.
• Slasher Smile: Not helped by his very sharp teeth.
• Small Name, Big Ego: While he's not a small name and is actually quite powerful, he thinks that he's the World's Strongest Man by virtue of being the king of the seas since all life originated from the sea, never mind that there are many more heroes and monsters out there that outclass him. Saitama quickly proves him wrong.
• Sorting Algorithm of Evil: Subverted. Despite being introduced later in the series and lasting longer, he's actually much weaker than previous monsters like Vaccine Man, Beefcake, and Carnage Kabuto. He only gets more screen time because he faced off against weaker heroes while Saitama was busy getting lost.
• Super Spit: He can shoot out acidic saliva from his mouth that is extremely corrosive, as it melted Genos' metallic body almost completely.
• Super-Speed: He boasts an exceptional amount of raw speed, seen when he was able to sneak up on Lightning Max (whom had been observing him from a distance) instantaneously, catching the A-Class hero well off guard. Under the rain, he can even keep up with Sonic's speed.
• Super-Strength: Comparable to an S-Class hero from the get-go, and it increases even further when in contact with water.
• This Cannot Be!: After getting a hole punched through him by Saitama, his final expression screams this before he keels over.
  • Averted in the anime; one of his eyes is dangling out of its socket, and his face resembles a dead fish, implying he was killed instantly.
• To Serve Man: He wants to turn humanity into food supplies for the Sea Folk.
• Underwear of Power: His attire oddly consists of only a crown, a cape, and underwear.
• Wake-Up Call Boss: In the anime, he's the first villain to last more than one episode. He also defeats several other heroes including two S-Class ones, albeit the lowest-ranked ones.
• Weak to Fire: Downplayed, but Genos' flame-based weaponry seems particularly effective against him, even forcing him to resort to dirty tactics because he was losing the fight. While it's never said that he is weak to fire and you could make the argument that Genos' power simply overwhelms him, the Sea King relies on hydration to reach his strongest form, excessive heat may dehydrate him, thus sapping his strength.
• Would Hurt a Child: Oh yes he would. During the Deep Sea King's fight with Genos, he even went out of his way to spit acid at a little girl just for cheering on Genos; and she would've melted had the cyborg hero not jumped in front of the corrosive fluid to save her.

Sky King

Sky King

Voiced by: Christopher Corey Smith (English)

Debut: Chapter 33 (Webcomic), Chapter 30 (Manga), Episode 10 (Anime)

Disaster Level: Demon

ESTIMATED DISASTER LEVEL: DEMON

The ruler of the skies, seeking to take over the world with his minions, the Skyfolk. Unfortunately, his conquest was cut short by the Dark Matter Thieves.

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• Arc Villain: After the defeat of the Underground King and the Sea King, the appearance of the Sky King seems to be the beginning of a new arc, to complete the Land, Sea, Sky trifecta. The birdmen however get massacred in a few pages by the actual new threat: an alien invasion led by galactic conqueror Boros.
• Bait-and-Switch: He gets subjected to a particularly brutal one.
• Big Bad Wannabe: He remarks in complete disbelief that, just when he was launching his attack to begin his conquest of Earth, he got fatally swatted (or sliced, actually) like a gnat by Melzargard, who isn't even the leader and strongest member of his own group.
• Bird People: His race are winged humanoids with bird-like traits.
• Breath Weapon: He and his Skyfolk can fire energy blasts from their mouths.
• Take Over the World: He gets his attempt for all of one minute before being fatally interrupted.
• Tengu: The Sky King and his minions resemble Tengu.
• Underestimating Badassery: He believed that he could take down the Hero Association's main headquarters. However, he did not even get the chance to be proven wrong...
• We Hardly Knew Ye: He and the Skyfolk are unceremoniously slashed into bits by Melzargard just as their invasion begins.

The Mad Cyborg

The Mad Cyborg

Disaster Level: Unknown (possibly Above Demon)

An unknown Cyborg that had destroyed Genos' hometown, causing the latter to become a cyborg himself in order to avenge his deceased family.

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• Ambiguous Situation: It's hard to say whether he even truly exists, and Saitama points out that he could have easily gotten rid of him without knowing who he was and therefore not knowing of his significance to Genos.
• Arch-Enemy: It's this to Genos for destroying his hometown. The hatred towards it that that burns in Genos's heart still rages as strong as ever even with Saitama's influence.
• Ax-Crazy: It's even in its title, and its backstory involves rampaging Genos' hometown and slaughtered everyone besides the latter.
• "Back to Camera" Pose: The only major image there is of him.
• The Dragon: Drive Knight believes that the Mad Cyborg is the most powerful asset of Doctor Bofoi, though it's unknown if he's actually correct or if he's even being truthful.
• The Ghost: He has yet to actually appear in the story.
• Greater-Scope Villain: He's a very important character in the creation of Genos and Drive Knight, though he hasn't officially shown up so far and it's implied he might not even exist, or perhaps not anymore.
• Killed Offscreen: Saitama brings up the theoretical possibility that, for all he knows, he could have already destroyed the Cyborg without knowing his identity or significance to Genos. His friend disagrees, insisting that the Cyborg would have absolutely made a lasting impression, even on Saitama himself.
• One-Man Army: This thing can easily destroy an entire village on the outskirts by itself, meaning that it's very powerful and dangerous. Also, it's confirmed by Drive Knight and Dr. Kuseno that the Mad Cyborg had rampaged against numerous other villages before Genos' hometown.
• Only Known By His Nickname: It's only called the "Mad Cyborg", "Crazy Cyborg", or the "Rampaging Cyborg".

Sage Centipede (Major Unmarked Spoilers)

Sage Centipede

Disaster Level: Unknown (possibly Above Dragon)

ESTIMATED DISASTER LEVEL: UNKNOWN

A centipede that somehow manages to dwarf every single one before him, including Elder Centipede. He emerges from the underground lava temple that Orochi would visit, in the exact same spot that Orochi was “destroyed” and “sacrificed.” He seeks to destroy all those who would defy the will of God.

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• Always a Bigger Fish: Somehow manages to one-up Centichoro of all creatures.
• Ambiguous Situation: He emerges from the exact same spot that Orochi was shredded at, making it unclear whether Orochi’s Uncertain Doom gave God the power necessary to summon Sage or instead Sage was able to appear due to absorbing and assimilating Orochi’s remains. Note that several of his body parts closely resemble those of Orochi himself. Coincidence, or The Assimilator / Fusion Dance?
• Anthropomorphic Personification: Calls itself the incarnation of the earth, while Evil Ocean Water is the incarnation of the ocean.
• Arc Villain: He shows up right before Saitama's fight with Awakened Garou, only to be finished off within a few chapters.
• Attack of the 50-Foot Whatever: Outdoes Centichoro in this regard, being the size of a city.
• Big Entrance: He appears from underground destroying the Monster Association headquarters and declares that he along with Evil Ocean Water will destroy the "Fist that Turned Against God." Garou isn't impressed.
• Dirty Coward: He tried to take Tareo hostage, and attempted to use Metal Bat as well, when Garou proved to be more than he could handle.
• Evil Is Bigger: While the the height of Sage wasn't officially revealed yet, his body can extend right to the surface of space.
• Half the Man He Used to Be: Garou kills him by slicing him vertically in half from head to tail. It's implied he didn't even need to do that to kill Sage Centipede, he just did to prove a point to Bang about breaking as many tiles as possible with one hand chop.
• Healing Factor: He has one just like Elder Centipede, though in his case it's tied to a specific organ and without he can't heal. The organ itself bears an uncanny resemblence to Orochi's flesh, further connecting the two.
• Super-Toughness: Takes several barrages from a fully monsterized Garou, helped by his Healing Factor, who just got through with absolutely shattering Platinum Sperm like glass.
• The Worf Effect: He is introduced by chewing right through the giant spear drill that Tatsumaki used to shred a heavily-injured Orochi.

"God" (Major Unmarked Spoilers)

"God"

Disaster Level: Likely God

A mysterious and powerful being. It gave Homeless Emperor his powers and played a major role in the creation of Psykorochi.

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• Adaptation Expansion: He plays a larger role in the manga. Specifically fusing Psykos and Orochi together and being the main reason Blast is so busy.
• Always a Bigger Fish: The biggest fish of all. Even the Monster King Orochi can only stare in awe and terror at God when they meet.
• Ambiguous Situation: We see two different forms of this being, one on the Moon and one deep underground below the deepest levels of the Monster Association HQ. Are there multiple "Gods" or is it the same being incarnating in multiple places? If there are two, who is the being beneath the Monster Association?
• Anthropomorphic Personification: God appears as the personification of nature, with characters like Vaccine Man and Homeless Emperor striving to annihilate humanity in the name of Mother Earth and two of his vassals, Sage Centipede and Evil Ocean Water, boldly claim to embody Earth and the Oceans. He doesn't seem to be limited to the Earth either.
  Homeless Emperor: There is no way to resist the will of the stars.
• Appearance Is in the Eye of the Beholder: He appeared as a giant, faceless humanoid to Homeless Emperor while Psykos perceived him as a giant planetoid comprised of what appears to be brain cells. He later takes on Blast's appearance to tempt Tatsumaki into taking his deal, and takes on Bang's to make Garou his offer. One trait that persists throughout his appearance changes is that he never has a face. He usually hides this fact if he takes on the appearance of somebody close to the person he's trying to make a deal with.
• Arch-Enemy: He appears to be this to Blast.
• Art Shift: In the webcomic, when he reclaims his powers from Homeless Emperor, he is drawn in incredible detail compared to the rest of the characters. Later, when Fubuki attempts to enter Psykos' mind to discover what frightens her so much, dark clouds in his realm are drawn hyperrealistically, creating an unsettling atmosphere.
• Artifact of Doom: The black cubes qualify as this. Anybody who uses them gains a massive power boost but the downside is that they either become a puppet in God's schemes or outright get killed.
• Artifact of Power: Considering an average human can become a dragon level threat even without the black cubes, they double as this on the top of being Artifact of Doom. They are so dangerous that Blast has to personally interfere whenever he senses them.
• Ax-Crazy: Due to the fact that taking in his power is enough to make the user become genocidal, it's very likely that God himself is this.
• Bad Moon Rising: So bad that its malevolence escalates the stakes to a level where entire civilizations hang in the balance. At the very minimum, you can expect villains to gain enough power to become global threats.
• Berserk Button: If he feels information relating to him is about to be exposed by the monsters he has empowered, he’s very quick to take back the powers and kill them.
• Biblical Motifs: He and his followers draw upon several biblical references. These allusions include his power to transform individuals into pillars of salt, Homeless Emperor embodying characteristics reminiscent of a Dark Messiah, Sage Centipede's uncanny possession of 6666 legs, and the striking parallels between Psykorochi and the imagery of the Whore of Babylon. Moreover, in a notable extra from volume 23, one of God's cubes can be observed resting atop the Ark of the Covenant, further intertwining elements of biblical symbolism into the narrative. It should be noted that both the black cubes and the Ark of the Covenant serve as means of communication with higher, supernatural powers.
• Big Bad: In the manga at least, he's the most important villainous threat to humanity beyond even Garou and the Monster Association, eventually being the reason why Garou becomes so powerful by giving him cosmic powers. He's also the reason why the highest ranked hero Blast is absent, who has formed an alliance with several yet unknown people to fight him.
• Big Entrance: God is rather fond of this. Whenever he appears, there is a good chance that it will be accompanied by a grand entrance such as climbing the Moon or causing storms just by stepping.
• The Blank: He doesn't have any facial features. No eyes, no mouth, no nose, no ears, no nothing.
• Body Horror: Its first clear depiction shows it to be a giant humanoid covered head-to-toe in mangled scar tissue, with skin even missing in places to show the muscle underneath, and even strands hanging off it. That and its size are its only physical feature.
• Body Motifs: Eyes play a recurring role in his narrative. The Moon serves as a symbolic representation of his eye, a motif emphasized in the covers of chapters 139 and 161. These chapters depict the Moon alongside an octopus' eye and a human eye respectively, underscoring its significance. Additionally, during the Saitama vs. Garou fight, Jupiter's Great Red Spot is artistically portrayed as another manifestation of his eye.
• Celestial Body: Whenever he decides to appear as something non-humanoid, the smallest thing you can expect is a planet. Another depiction of him is covered in stars while one of the chapter covers has the entire observable universe as his eye.
  Psykos: I saw brain cells... Or perhaps the structural diagram of the universe... It sort of looked like the surface of Jupiter... Something like God.
• Cherry Blossoms: This trope is at play moments before he takes Homeless Emperor's life, signifying the impending death of the latter.
• The Corrupter: Just taking in its power is enough to make the receiver crueler and genocidal. When Garou takes in its power, he goes from merely beating up heroes to actively laughing about the prospect of killing everyone on Earth with his radiation even though that goes against his plan of Absolute Evil.
• Cosmic Entity: He certainly can be considered one of them. See Celestial Body above.
• Cosmic Motifs: He exhibits a profound connection to celestial entities, with a particular affinity for the Moon. Additionally, intriguing associations have been drawn between him and Gustav Holst's masterpiece, "Jupiter, the Bringer of Jollity," as well as Pablo Carlos Budassi's awe-inspiring "Map of the Universe."
• Deadly Euphemism: God often uses "forfeit" in lieu of the harsher term "kill," revealing a linguistic choice that reflects his cold and detached nature.
• Deadly Gaze: Implied. During Tatsumaki's battle against Psykorochi, we suddenly get a close shot of the Moon as she is about to finish off the latter. It gets followed by Tatsumaki bleeding out from every orifice in her body.
• Deal with the Devil: It makes one of these with Homeless Emperor and attempted to make one with Tatsumaki and then Garou as well. It doesn’t actually need the consent of the one it’s trying to make a deal with. All it needs to bestow its powers and desire to eradicate humanity is a simple touch.
• De-power: Exaggerated. He possesses the ability to strip away the extraordinary powers he has bestowed upon individuals, reducing them to the brink of death. Additionally, he is hinted to be the architect behind the very notion of setting limits on human potential.
• Do Not Taunt Cthulhu: Once Garou sees through God's disguise, he starts to mock him, but God points out the folly of touching him. In the very next scene, Garou is almost killed by the energy overflow. Fortunately, God's intent wasn't lethal at that particular moment.
• Eldritch Abomination: It appears to Psykos as a massive planetoid comprised of what appears to be brain cells.
• Evil Is Angular: Inverted. God's manifestation defies angularity, presenting a form that transcends sharp edges. His humanoid semblance, bereft of distinct features, takes on a rounded aspect, and there are instances where he manifests outright as a planet.
• Evil Is Bigger: A towering presence within the series, unrivaled by any other. Encounters with such a colossal being are a rarity, to the point that even Sage Centipede appears as nothing more than an ordinary insect in comparison.
• Final Solution: In pursuit of his ultimate objective, getting rid of humanity is a crucial step. The rationale lies in the recognition that their continued existence only perpetuates environmental harm and disrupts the delicate balance he seeks to restore. Also see Humans Are Bastards and Kill All Humans.
• A Form You Are Comfortable With: Exploited. In his dealings with heroes, he adeptly assumes the guise of someone close to them, leveraging their emotional connections to further his own agenda.
• Fourth-Wall Observer: He is seen watching Murata's work in Volume 25 extras.
• Fridge Brilliance: In-Universe. Why is the final and most dangerous disaster level called God? Why is Fenghuang, a being associated with virtue and grace, used to represent it? It is because of this guy.
• Garden of Eden: Strongly implied to be the place Homeless Emperor is summoned to before his demise. According to the chapter cover, it is "The garden of knowledge and superpowers."
• Genius Loci: Appears as a planet multiple times.
• Go Mad from the Revelation: Whatever it is he is doing in the future, it tends to have this effect on those who try to look at it. Shibabawa died after looking into the future. Psykos went insane. Fuzzy became a pawn of The Organization.
  Fubuki: What did you see happening in the future? You never were such a strong child. What made you change? The source of madness... Is it because you peeked into the future?
• Greater-Scope Villain: It is possibly a God-level threat and probably the one behind all the events related to the Monsters, as it's implied to be the "God" of all Mysterious Beings. Even moreso in manga than webcomic.
• Handshake of Doom: He seals his deals with handshakes. Needless to say, these deals mean stripping the other party of their humanity and worse.
• Hellgate: He resides in a hidden dimension that's only accessible through what is called the Gate of the Celestial Rock Cave.
• Holy Is Not Safe: The powers he bestows are acknowledged as divine by both friends and enemies alike while also being one of the most dangerous elements in the setting.
• Horrifying the Horror: Both Orochi and Psykos are stunned into silence in his presence. Psykos notes that she was filled with fear just by watching him.
• Humanoid Abomination: It appears to Homeless Emperor as a giant humanoid with Creepily Long Arms, covered in scar tissue from head to toe and with no face.
• Humans Are Bastards: What he believes in and probably the main reason why he wants to Kill All Humans. In Psykos' words, humans have no concept of balance and the only thing they are good at is damaging the planet.
• Hypocrite: Despite sharing Homeless Emperor's beliefs on the surface level, he causes the death of all life on Earth and nearly the destruction of it by using Garou.
• Implied Death Threat: In the subterranean depths of Monster Association, he subtly alludes to the fate awaiting those deemed unworthy of his powers, emphasizing an imminent "forfeiture."
• Imposter Forgot One Detail: He pretends to be Blast when appearing in Tatsumaki's mind and offers her its power to destroy all her enemies. The real Blast told Tatsumaki to never rely on others, clueing her in that the Blast before is a fake. Later on it pretended to be Bang and offered Garou some help against Saitama, except that the real Bang prefers to give Tough Love.
• Invisibility: He is depicted as invisible to those he wishes to elude; not even Saitama can perceive him.
• Kill All Humans: Agrees with Homeless Emperor's belief that humanity is a worthless plague that should be wiped out. Gives power to Psykos to do the same and nearly achieves it in the parallel timeline.
• Knight of Cerebus: To the extent that his presence singlehandedly transforms the typically comedic series into a realm reminiscent of Lovecraftian dread, God stands as the epitome of the 'Knight of Cerebus.' A mere comparison of his character profile and narrative impact against other villains serves as a stark reminder of just how unparalleled and unsettling his presence truly is, setting him apart from every antagonist introduced thus far.
• Leaking Can of Evil: Given the extent of his interaction with Earth, it often appears as though he is far from being effectively sealed. However, there are justifiable instances where the seal's effectiveness also becomes apparent. Notable examples include communication facilitated by black cubes, which are designed to distort space for interaction with God, and Garou's unprecended power-up, as it was explicitly noted that the seal was significantly weakened by the use of Extreme Fajin.
• Leonine Contract: He often strikes such deals when the other party is at their lowest or on the verge of death. Surprisingly, its outcomes are as unpredictable as they are sporadic, yielding both success and failure.
• Loophole Abuse: God empowers Garou through one of these. Rather than taking his hand, just making contact with it is enough to get his powers. And touching his hand by slapping it away also counts as making contact.
• Magic Must Defeat Magic: According to Sitch, those without the capability to manipulate space and time cannot challenge God.
• The Magic Touch: One touch from him can grant powers beyond imagination. That's assuming you can take it.
• Make a Wish: Invoked. This is one of many functionalities of black cubes.
  God: Place your hand upon that box and make a fervent wish.
• The Man Behind the Man: Psykorochi obtained their new powers from this creature as a representative of its will. He's also responsible for Garou becoming Awakened Garou: Cosmic Fear Mode and nearly obliterating Earth and several portions of the galaxy.
• Non-Humans Lack Attributes: As seen in his image above, he doesn't possess attributes.
• Offerings to the Gods: The ancient mural depicting him has pictures of people sacrificing various animals and apparently human infants to resurrect him. King Orochi was meant to be the ultimate sacrifice among them.
• Ominous Clouds: During the sequence where he gives Garou his powers, ominous cumulonimbus clouds form with every step as he advances, punctuated by raging lightning storms. Furthermore, in a flashback depicting the showdown between Blast and Elder Centipede, the sky cloaks itself in an impenetrable shroud of darkness, foretelling the gravity of the rapidly approaching conflict.
• Ominous Cube: One of his main communication methods is mysterious black cubes that grant extraordinary powers to those who possess or interact with them, bestowing unique abilities or altering reality in some way.
• Ominous Mundanity: Downplayed. While the term "God" isn't necessarily commonplace, what adds to the disconcerting aura surrounding this entity is his singular, nameless identity—he's labeled simply as "God", leaving a sense of unease in its wake.
• Ominous Walk: In the webcomic, right before Homeless Emperor's death scene, God slowly and eerily approaches him, twisting his own body in an unnatural manner, as though readjusting his disjointed limbs.
• Omnicidal Maniac: Not only does he want humanity gone, but he also doesn't care about life in general as shown when a portion of the galaxy gets wiped out thanks to his influence. The fact that Blast's team has aliens suggests he is a threat to the wider universe as well.
• Only the Chosen May Wield: You need to be deemed worthy by God to benefit from his black cubes.
• Only Known by Their Nickname: It is called "God" by Homeless Emperor, but we don't know how it calls itself.
• Our Giants Are Bigger: Aside from its first introduction to Homeless Emperor (and the readers), every depiction of it is massive. Before Psychos and Orochi become fused, Psychos sees it as a planet, Saitama, Flashy Flash and Manako stumble upon it underground, but are unable to grasp what it actually is due to its size, and before killing Homeless Emperor it appears to him again as first being big enough that it can only barely stand on the moon, and in another vision being taller than most mountains.
• Planet Destroyer: As seen with Garou, only a tiny fragment of his energy is needed to lay waste to the entire world.
• Pre-Mortem One-Liner: "Your power, your life, they are both forfeit."
• Radar Is Useless: The inability of any of the Hero Association's equipment across the globe to detect him is used as an immediate indicator of the staggering power gap that exists between God and the Hero Association.
• Reality Warper: To a greater degree than anyone in the series.
• Reset Button: In a Q&A session, Murata theorizes an ending where God serves as this to the whole universe upon his defeat, resulting in a Reset Button Ending for the series. Cue human Genos and Saitama with his hair.
• Sacrificial Revival Spell: According to the underground mural, he will be resurrected once a worthy sacrifice is offered. Also, see the Offerings to the Gods entry above.
• Sealed Evil in a Can: He is currently sealed away and as mentioned in the previous tropes, he needs a sacrifice to manifest on Earth based on the altar Orochi found out. It is shown that his skeleton is buried under the moon itself.
• Sealed Evil in Another World: "God" is multiple times alluded to as being within an alternate dimension. Blast's statements strongly hint at the presence of a restraining force known as the Dimensional Seal, which serves to confine this enigmatic entity.
• Sizeshifter: Across his appearances, he undergoes remarkable size fluctuations, ranging from the scale of an average human to surpassing the dimensions of the observable universe.
• Splash of Color: In the manga, rather than featuring an Art Shift as seen in the webcomic, the panels undergo a sudden transformation into color as God kills Homeless Emperor. The sudden infusion of color in the panels adds a vibrant and dynamic element to this crucial moment, enhancing the visual impact of the narrative.
• Super-Empowering: Gave Homeless Emperor his powers, and took them from him as well. It gave Psykorochi a dramatic increase in terms of abilities, and later upgraded Garou from his Monster form to his Awakened form in the manga.
• Superpower Lottery: He is clearly a cut above any other being in the series. A touch from his hand granted Garou the knowledge of all forces in the cosmos and this is just a fraction of what he can do.
• Telepathy: His main way of communication. It is lampshaded in chapter 139 - "Abyss".
  Flashy Flash: It's not coming through my ears. Is this telepathy?
• Takes Ten to Hold: It should be telling when Blast and an entire team of individuals at his caliber are required to prevent him from breaching dimensions.
• That's No Moon: When Saitama and Flashy Flash stumble upon him underground, the enormity of his starry physique renders him nearly imperceptible against the backdrop, catching them unaware of his presence.
• Time Master: Mastery over space-time is a prerequisite for daring to confront God. His repertoire includes the ability to traverse time, manipulate the speed of it—be it slowing it down, hastening its pace, or bringing it to a complete standstill. The very fabric of time itself bends to his will, allowing him to craft rifts and fissures within its continuum.
• Time Stands Still: Psykos and Orochi experience this when facing him for the first time.
• Transmutation: Those who face forfeiture turn to salt.
• Troubled Fetal Position: Oddly contrast to his sinister nature, God is shown in this position in chapter 138 - "Into the Abyss". Even the most malevolent beings seem to have their offbeat moments.
• Walking Spoiler: This thing spells major villain in the future, is super important to the plot and so far only appeared in a few panels in both the webcomic and manga.
• Weather Manipulation: He can create storms merely by walking.
• We Can Rule Together: In a turn of events two years ago, God presented Blast with an offer of immense power, attempting to recruit him despite their ongoing conflict spanning over two decades. The result unfolded in a manner one might anticipate.
• Weird Moon: The Moon boasts a colossal crater, giving it an uncanny eye-like appearance, yet strangely, no one seems to give it a second glance. The justification lies in Saitama's handiwork, with the populace attributing it to King's deeds. However, a more intriguing mystery unfolds on the Moon's dark side—a massive crater harboring a colossal celestial carcass, stirring a separate wave of curiosity.
• Wham Shot: In nearly any scene he appears in, expect the extraordinary. Be it the sudden revelation of his true visage amidst a perfectly innocent conversation, his descent through parted clouds onto Earth in the middle of a fight, or his emergence from the Moon's dark side, when God makes an entrance, the narrative undergoes a 180-degree twist in an instant.
• World Pillars: He summons Psykos and Orochi to Pillars of Creation as he gives power to them.
• Year Outside, Hour Inside: His black cubes have this effect on those who are near them. Just the time delay it caused when Blast teleported Saitama and Flashy Flash out of underground was enough for the cadres to emerge and get defeated.
• You Are a Credit to Your Race: Despite his profound disdain for humanity and his desire for their extermination, he recognizes the similarity in Homeless Emperor's ideology and contends that his own demise is unnecessary.
• You Have Failed Me: The reason he kills Homeless Emperor. And later Garou in the "terrible future". When Saitama comes back in time to stop Garou, his power gets lost before God can kill him.
• You Know What to Do: His farewell words during his introduction in Homeless Emperor's flashback. He uses similar words at the end of his conversation with Garou as well.
  God: I will grant you power. What to do with this power, you should know.

The Subterraneans

The Subterraneans (in general)

Subterranean People

Subterranean King

A group of underground monsters bent on taking over the surface world. They are at odds with the Seafolk and Skyfolk as well, but the relationship between these groups is not explored as none survive the series long enough.

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• Adaptational Expansion: The anime adds the bigger Subterranean People in 2nd part of their fight with Saitama, and Subterranean King is much bigger than in the manga or webcomic... Though it's All Just a Dream too.
• Arc Villain: Possibly the biggest ones for the Saitama Introduction Arc, having the most screentime in dream sequence, though just like the rest of monsters they are also finished rather quickly in real time.
• Back from the Dead: Resurrected by Phoenix Man in his battle with Child Emperor, to fight and cause as much problem as possible for a hero.
• Baitand Switch: Seems like finally Saitama has found actually strong opponents, eventually encountering Subterranean King... and then he wakes up, revealed to be as rather weak in real life.
• Brick Joke: A couple of the resurrected creatures appears to be as big as the ones that Saitama dreamed about. Perhaps he just wiped them out too quickly.
• Dreaming of Things to Come: Not them, but Saitama has a dream about them taking over the surface world the night before they reveal themselves.
• Killed Offscreen: Apparently didn't submit to or were declared too weak to join the Monster Organization. (While Genus could have done it, he would have needed to know about the Monsters Organization's lair, which he doesn't, given where their corpses were found). Oddly, they were dumped into a deep pit of water instead of being fed to Orochi.
• Small Name, Big Ego: At least their king was. He thought he could take over the surface world, but given how small he was and how doofy he and his minions looked compared to their dream counterparts, they were definitely not strong enough to beat the heroes.
• What Happened to the Mouse?: They lived underground and popped up in Z City where Saitama lives and where the Monster Organization eventually set themselves up. It was possible they could have moved and they don't come up later on in the Webcomic, but the manga shows their dead, rotting bodies in the flooded area of the monster's base. Phoenix Man's thoughts imply the Monster Association had them killed.
• Worthy Opponent: What Saitama declares them to be in his dream and the feeling was mutual. In reality, they are a case of Small Name, Big Ego.

House of Evolution

House of Evolution (in general) (Spoilers)

An organization founded by Doctor Genus to pursue the goal of biological perfection though artificial evolution. They are the first antagonists fought by Saitama and Genos, being easily annihilated by the master and his disciple. After their fall, the remnants of the House of Evolution open a takoyaki stand.

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• Arc Villain: Of the titular House of Evolution Arc, being the first genuinely recurring antagonists in the series. Genus and Gorilla (and Mosquito Girl in the manga) do show up again later in the story, but they have since pulled a Heel–Face Turn.
• Genetic Engineering Is the New Nuke: All of the various mutant monsters in this group were created by a Mad Geneticist in his secret laboratory.

Doctor Genus

Doctor Genus

Voiced by: Daisuke Namikawa (Japanese), Ray Chase (English), Christian Strempler (Latin American Spanish)

Debut: Chapter 7 (Webcomic & Manga), Episode 2 (Anime)

The founder of the House of Evolution, whose dream was to hasten the evolution of humanity past its limits through artificial methods. He set his sights upon Saitama upon seeing his immense strength - much to his own detriment.

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• Arc Villain: He's the brains behind the House of Evolution. Hilariously, he is very dramatically set up as though he will be the Big Bad of the entire series, only to completely give up on super-villainy after watching Carnage Kabuto get obliterated by Saitama.
• Bait-and-Switch: His introduction almost set him up to be a Big Bad with a god complex who couldn't be reasoned with. However Saitama beating Carnage Kabuto abruptly shocked him into a Heel–Face Turn and he abandoned all his thoughts of villainy.
  • Also, everything about his modus operandi: an evil scientist with an army of genetically engineered monsters all sharing the same theme and countless identical clones, seem to be setting him up as a recurring villain or even the hero's main nemesis... Yet he reforms after a single encounter with Saitama.
• Break the Haughty: Saitama inadvertently does this by entering his "House of Evolution" and casually destroying Carnage Kabuto, whom he considers the proof of his belief in artificial evolution.
• The Bus Came Back: Genus finally returns after more than 70 chapters later in Limiter arc, to explain Zombieman some important things.
• Comical Overreacting: When he talks to Zombieman about Saitama, he says that the latter had paid a terrible price for his strength... he went bald. After a moment, he also adds in the part where Saitama is feeling complete disassociation from humanity and is progressively being distanced from his own, but the baldness came first.
• Cut Lex Luthor a Check: Sort of. After he's defeated, he devotes his genius to running a takoyaki stand using his genetically-engineered generating octopi. It's perhaps not the most practical thing he could do with his genius, but he seems to be happy.
• Disc-One Final Boss: An absolutely hysterical Bait-and-Switch example for the series as a whole.
• Evil Genius: It's even in the name itself.
• Evil Old Folks: He is over 70 years old, but doesn't looks it thanks to having used a youth serum.
• Evilutionary Biologist: He creates genetically-spliced monstrosities out of his extreme contempt for regular old human beings.
• Expendable Clone: Played straight as well as inverted. He even considers himself expendable.
• Four Eyes, Zero Soul: Glasses? Check. Evil? More or less, though he more doesn't exactly like people.
• Heel–Face Turn: Sort of. Having been psychologically beaten, he decides he's done with evolution and decides to open a takoyaki stand. Later he's shown helping Zombieman to break his limiter, giving him rough beatings by monsters.
• Hidden Depths: Despite only meeting him once, he's one of the few people who understands Saitama well enough to not only recognize his strength but to realize that his strength hasn't made him happy.
• Karma Houdini: Despite having unleashed Mosquito Girl (who killed a few of people), sending his minions to attack Saitama, and creating Carnage Kabuto (who is implied to have killed plenty of people,including doctor's clones), he gets off scot-free short of the injuries he sustained at the hands of Carnage Kabuto. It helps that he decided to put being a supervillain behind him.
• Know When to Fold 'Em: After being defeated, he decides to devote his life to running an otherwise entirely-normal takoyaki stand, using regenerating octopi for meat.
• Identical Twin ID Tag: Unlike his lookalike clones, he parts his hair on the opposite side.
• Lack of Empathy: He has difficulty empathizing with people, paired with his drive to improve the human form through artificial evolution, he feels that the rest of humanity are practically lowly animals.
• Mad Scientist: He abuses his great intellect to create homicidal monsters after all.
• Maker of Monsters: He's an Evilutionary Biologist with a god complex who creates all kinds of monsters, making powerful Bioweapon Beasts that can easily destroy an entire city.
• Meaningful Name: Genus looks like "genius". It is also a biological term, suggesting his mad science specialty.
• Me's a Crowd: He created countless copies of himself. They are actually his employees and he doesn't seem to care much about them.
• Mistaken for Gay: A throwaway joke used when Saitama was told that the scientist had "a great interest" in his body... Of course, he is only interested in Saitama's strength.
• Mr. Exposition: He provides the closest thing to an explanation we've gotten so far for Saitama's strength and the nature of Mysterious Beings.
• Nice Job Fixing It, Villain: Created Zombieman who became one of the toughest superheroes around. He actually seems impressed and vaguely proud that Zombieman chose the hero life when they meet again. He is still slightly annoyed that Zombieman wrecked his experiments when he escaped though despite having given up that life.
• Older Than They Look: That's not a young man in his late twenties you're looking at — it's a man who reached his seventies, upon which he discovered the secret to regaining his youth, and revitalized himself. As for his clones, it's the other way around, having been around for only a short amount of time but the same biologically as him in his youth.
• Omnidisciplinary Scientist: His backstory implies that he was an expert in several fields, though genetics became his specialty.
• Sherlock Scan:
  • After seeing Saitama beat his ultimate monster, he correctly deduces that the man isn't just powerful, but that his power is without limits. This is proven true in Saitama's fight with Garou. Like Garou, Saitama gained more and more power each time he was heavily injured as Lord Gyoro-Gyoro's experiments proved. However, Garou and Lord Orochi eventually hit a limit they couldn't break while Saitama scattered that upper limit perhaps due to having an Enlightenment Superpower of a sorts.
  • He also catches Saitama's bored expression after winning with one punch, and correctly infers that this means that his power has alienated him rather than making him happy, something almost nobody else in the series notices.
• Social Darwinist: He believes humanity should use its expertise to accelerate their evolution to become stronger and smarter. When his ideas didn't get support, he resolved to build a utopia shaped by and for himself.
• Sole Survivor: After Saitama and Genos destroyed the House of Evolution and killed all of the members... Apart from some small fries, only he and Armored Gorilla managed to survive. A picture in the artbook implies that Mosquito Girl may have survived as well (showing her fixed up with artificial limbs and working at his takoyaki stand), although whether it's canonical or not is unclear. Later Chapter 190 of the manga confirmed she's alive.
• They Called Me Mad!: In his youth, he called for humanity to find new ways to evolve. He didn't receive any mainstream support, and decided to go about it by himself.
• World's Smartest Man: Doctor Genus is implied to be this. His intellect was so advanced that he soon became disillusioned with the rest of humanity and could find no one else able to keep up with his level of thinking. He soon came to believe humanity was too far behind him and sought to help the human race evolve so that he would no longer be alone.
• You Are Number 6: While he wears dark clothing, his clones wear white jumpsuits and are differentiated by the number on their shirts.

Mosquito Girl

Mosquito Girl

Voiced by: Miyuki Sawashiro (Japanese), Cristina Valenzuela (English), Adriana Nuñez (Latin American Spanish)

Debut: Chapter 5 (Webcomic & Manga), Episode 2 (Anime)

Disaster Level: Demon

ESTIMATED DISASTER LEVEL: DEMON

A prototype mutant human-mosquito hybrid created by Dr. Genus. She faces Genos in Z-City, and her defeat at the hands of Saitama is what informs Dr. Genus of Saitama's existence.

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• Adaptational Attractiveness: Mosquito Girl in ONE's style is essentially a woman's head and upper chest stuck onto a mosquito body, with her arms and legs being far more shriveled and insectile. Murata designs her more as an attractive woman with mosquito features, with a defined lower body and even hips.
• Artificial Limbs: After she’s revealed to be alive and working at the takoyaki stand in the manga, her insectile limbs have been replaced with more human looking artificial ones to better blend into society.
• Ax-Crazy: She's definitely quite gleeful about draining people dry to boost her strength, and when she fights, she really gets into it.
• Barbie Doll Anatomy: Her crotch isn't drawn at all, and her nipples only appear as subtle small bumps on her chest.
• The Beastmaster: She can control a huge swarm of mosquitoes.
• Bishōnen Line: She looks less insectoid after her transformation. She was still cute before, though.
• Blood Lust: Well she is a mosquito, kinda a given and it's what powers her up.
• Body Horror: While her human body is very attractive, her limbs are indeed those of an actual mosquito. They look quite creepy and off-putting. Artwork and chapter 190 of the manga shows she lost these in place of Artificial Limbs. Now people think she’s a human woman who simply wears an insect costume.
• Bring It: In anime she says this to Genos before their fight, while making a Slasher Smile.
• The Bus Came Back: She was one of the earliest monsters in order to introduce Genos, but disappeared until chapter 190, even though Dr Genus and Cyborg Gorilla were occasionally shown.
• Character Development: Zig-zagged. Her reappearance in ch 190, shows her to be much more friendly and hospitable to people than she was introduced as an Axe-Crazy monster driven by literal Blood Lust. But she still threatens to drain people if sufficiently hungry/pissed enough.
• Cute Monster Girl: Given her Adaptational Attractiveness thanks to Murata style. She becomes even more cute when she’s shown to have lost her blood sack, had her insect limbs replaced with more human looking artificial ones after her battle. Now people mistake her for a human who simply wears an insect costume as a gimmick.
• Drunk with Power: Somewhat. She seems suave, but after absorbing all that blood she becomes much more unhinged, complete with Slasher Smile and shrunken eyes. Either that or she was always that crazy to begin with and just attempted to hide it.
• Flies Equals Evil: There are more than enough mosquitoes at her disposal to drain her victims of literally all their blood.
• Full-Frontal Assault: She is stark naked, as you can see in the manga when her belly button is clearly visible, and she doesn't seem to wear anything other than having body-paint or body coloration.
• Glass Cannon: Very, very fast and powerful, shredding Genos easily — but he didn't seem to have much trouble with ripping her lower legs clean off. So naturally, taking a single slap by Saitama produces very gory results. Cleanup on Aisle 4.
• Karmic Death: Mosquito Girl gets swatted by Saitama, leaving a bloody stain on the wall (although the "death" part is debatable; see A Twinkle in the Sky below). She officially survives in the manga.
• Leg Focus: And Genos takes care of them. She gets better, after absorbing blood.
• Mosquito Miscreants: A humanoid, Ax-Crazy mosquito.
• Ms. Fanservice: As stated above, she is an attractive woman with mosquito features in the manga. In the anime she also gets various shots of her body and has a sensual voice.
• Nightmare Face: The flash of her face as she started transforming in the anime was of her making a giddy Evil Laugh with glowing red eyes while drawn in shaking pencil lines.
• Not Quite Dead: At first, we thought she went splat after Saitama swatted her but there are hints that she may have survived ; see A Twinkle in the Sky below. It's the confirmed in chapter 190.
• One-Winged Angel: After injecting herself with blood, she become much faster and powerful.
• Paint the Town Red: In the manga, she's just swatted through a building. In the anime, her blood-engorged abdomen messily explodes, leaving a large smear on the side of the building. The DVD version (which is also the Adult Swim one) had her both splatter her abdomen on the building and getting swatted through the building.
• Shameless Fanservice Girl: She doesn't seem to mind that Genos sees her nude, or if anyone else would be around the city as she raids it. But then again, being part insect provides some degree of exoskeletal modesty.
• Slasher Smile: She makes one quite a few times, especially in her second form.
• Super Mode: After absorbing enough blood, she Turns Red, regenerates her legs and becomes so fast that not even Genos, who fought her on even footing before, could keep up with her.
• Super Prototype: Said to be just a prototype, despite being the second strongest monster of the House of Evolution after the transformation.
• The Swarm: A large mosquito swarm, which she uses to drain animals and people and absorb their blood.
• A Twinkle in the Sky: It's blink-and-you-miss-it, but a humanoid form can be seen right after Saitama's swat sends her hitting a building in all three media forms. Some fans base themselves on this to argue that she may have survived after all. Her survival is confirmed in chapter 190
  • In the anime, there is some red flash appearing at the upper part of the scene right after lots of blood was splatter all over the building which would also hint her survival.
• Vampiric Draining: The blood that her mosquitoes suck is used to increase her own power, given that she herself is a mosquito person.

Carnage Kabuto

Carnage Kabuto

Voiced by: Unshō Ishizuka (Japanese), Mike McFarland (English), Miguel Angel Ghigliazza (Latin American Spanish)

Debut: Chapter 9 (Webcomic & Manga), Episode 3 (Anime)

Disaster Level: Dragon

ESTIMATED DISASTER LEVEL: DRAGON

Click ^here to see his Asura/Carnage Mode.

The pinnacle of Dr. Genus' efforts to create a physically perfect specimen - however, his mental state is unhinged and insane. He is easily the strongest being in the House of Evolution.

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• Alien Blood: His blood is phosphorous green.
• Ambiguous Situation: It's not revealed yet if the new revived Kabuto that battles Zombieman to help break his limiter is the same one or if he's also a murderous Blood Knight monster.
• Aura Vision: He is capable of visualizing Saitama's power as an overwhelming aura.
• Ax-Crazy: Extremely unstable. He is very intelligent, but has an insatiable blood lust and thus had to be locked up because he kept killing anything that got near him.
• Back from the Dead: Him or a clone of him is brought back to help train Zombie Man. Since Dr. Genus is okay with being in the room when this one is fighting, he seems to have this version under more control or fixed the insanity issue.
• Dub Name Change: The official translation refers to him as Carnage Kabuto, and he enters "Carnage" mode instead of "Asura" mode. Happens again in the Latin American dub, where he is called Asura Kabuto and the name of his second form is restored to "Asura mode".
• Evil Is Hammy: The anime in particular makes him an enormous ham, with his voice, facial expressions and body language all being as over-the-top as possible at every conceivable moment.
• Evil Sounds Deep: Part and parcel when the one providing the voice is Unshō Ishizuka.
• Freak Out: Has a minor one when he realizes Saitama is much, much stronger than he thought.
• Genius Bruiser: Despite his arrogance and violent temperament, he's actually very intelligent and observant. He immediately realizes how strong Saitama is when he attempts to attack him.
• Gone Horribly Right: The pinnacle of the House of Evolution's experiments, but has to be chained in the basement because of his madness.
• Hoist by His Own Petard: By accident. His Carnage Mode lasts for a week... but he mentions that it'll last "until next Saturday". Saitama realizes that means today is Saturday, which means he's missing bargain day at the local supermarket, motivation enough to reduce Carnage Kabuto to a smear.
• Laughably Evil: The anime in particular takes his psychotic, brutish demeanour to ludicrous extremes, with his body visibly contorting under the sheer force of his Large Ham personality whenever he's on-screen.
• Lightning Bruiser: Enough to beat Genos to a pulp.
• Nonindicative Name: Aside from the horn, his body isn't really based on rhinoceros. Rather, it's more like a rhinoceros beetle (''kabutomushi" in Japanese). The official translation even calls him "Carnage Kabuto" instead.
• Overly-Long Tongue: In the anime. And he likes to remind the audience of it.
• Shout-Out: The green Tron Lines that it gains in the anime, along with its horn and purple skin during Asura Mode, make it look like EVA-01.
• Spider-Sense: He could sense just how dangerous Saitama is.
• Super-Breath: Capable of reflecting Genos' incinerator back at him.
• Super Mode: Asura Mode. Of course against Saitama it doesn't help much, and he gets killed in one hit.
• Super-Strength: He boasts a great amount of strength seen as how he was able to badly damage Genos with minimal effort in his base form.
• Super-Speed: Despite his enormous size he boasts an exceptional amount of speed that he uses to attack his enemies before they can even react.
• Super-Toughness: Completely unfazed from Geno's blasts or punches.
• Ultimate Lifeform: He was created to be this and certainly quite the Genius Bruiser. Also utterly insane and thus deemed a failure.
• Underestimating Badassery: Double Subverted. He freaks out upon realizing Saitama's stronger than he expected, but upon hearing about how Saitama got so strong, his disbelief and anger causes him to discard his assessment and use Asura Mode to attack. He should have stuck with it.
• Unstoppable Rage: The effect of his Asura Mode, declared to last an entire week. Leads to his undoing in a roundabout fashion.
• With Great Power Comes Great Insanity: He is the most powerful creation of the House of Evolution, but is too sadistic and unhinged to be of any real use. This gets him locked in chains in the basement, until he is released to face Saitama.

Beast King

Beast King

Voiced by: Jiro Saito (Japanese), Paul St. Peter (English), Dan Osorio (Latin American Spanish)

Debut: Chapter 8 (Webcomic & Manga), Episode 2 (Anime)

Disaster Level: Demon

ESTIMATED DISASTER LEVEL: DEMON

The second-most powerful creation of the House of Evolution and the leader of their strike force.

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• Absurdly Sharp Claws: Sharp enough to slice entire buildings to pieces.
• Affably Evil: He politely waits when Saitama needed to shake dirt out of his pants.
• Bad Boss: Doesn't hesitate to slice weaker allies to pieces if they are in his way.
  "Such is the law of the jungle!"
• Calling Your Attacks: "LION SLASH!" "METEOR POWER SHOWER!!"
• Casting Gag: According to Paul St. Peter, he was cast because the voice director of One Punch Man's English dub knew he had voiced Leomon previously, and wanted him specifically.
• Expy: Of Leomon from Digimon who was also a bipedal lion with a similar color scheme. In fact Leomon was also known as "The Beast King", which comes from his "Fist of the Beast King" attack Beast King's "Lion Slash" seems to be referencing visually. It doubles up in the English version, where his voice actor did voice Leomon too.
• Eye Scream: Threatened to claw Saitama's eyes out. In the end, Saitama ended up waving his dismembered eyeball as a trophy.
• King of Beasts: A human-lion hybrid, although he is only the second most powerful member of the House of Evolution, not the most powerful. But, even though he is not more powerful than Carnage Kabuto, Beast King's status as the second most powerful member of the House of Evolution and Carnage Kabuto's status as a failure, this would mean he is the most successful experiment produced by the organization.
• Ludicrous Gibs: What Saitama's Consecutive Normal Punches reduce him to.
• No Kill like Overkill: Beast King is the second strongest fighter of the House of Evolution. He got killed when Saitama used Consecutive Normal Punches. Saitama took out the strongest fighter, Carnage Kabuto, with just one normal punch.
• Smug Super: Somewhat understandably self-confident, due to his high power level.

Armored Gorilla

Armored Gorilla

Voiced by: Shota Yamamoto (Japanese), Kaiji Tang (English), David Camarillo (Latin American Spanish)

Debut: Chapter 7 (Webcomic), Chapter 8 (Manga), Episode 2 (Anime)

Disaster Level: Demon

ESTIMATED DISASTER LEVEL: DEMON

A cyborg gorilla created by Dr. Genus. He is notably more sane than the rest of the House of Evolution, even surviving the conflict to live a peaceful life at Dr. Genus' takoyaki stand.

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• Adaptation Expansion: Is spared by Saitama, but never shows up again. In the anime, it is revealed he works with Genus in his takoyaki stand. He reappears in the manga when Zombieman finds him and Genus.
• Affably Evil: He turns out to be one, and after retiring he's pretty much quite laidback and softspoken.
• Bad "Bad Acting": Being legitimately threatened with death while mostly dismembered and shown the eyeball of the monster one rank above him in strength in his organization caused him to instantly drop his unflinching robotic persona and go into a state of panic. And then he got yelled at by Saitama for dipping back into the performance while providing an overly-long Infodump on the House of Evolution and its creator.
• Curb-Stomp Battle:
  • Gets quickly beaten by Genos in one of the battles where he doesn't lose a limb.
  • In manga Chapter 78 though, he pulls this on Marshall Gorilla, an up-and-coming Tiger-class Monster that wanted to be promoted to Demon, beating him in one punch while out for groceries and having no understanding of what was going on or why, not unlike Saitama.
• Cyborg: He's the only combat cyborg in the House of Evolution.
• Exactly What It Says on the Tin: Well most monsters in the House of Evolution are like this, but he is well, essentially a gorilla in an armor.
• Heel–Face Turn: Reappears alongside Genus in episode 11 of the anime, with the two of them cooking takoyaki and watching the events of the Alien Invasion on TV.
• Killer Gorilla: A cyborg gorilla that starts off as a villain.
• Know When to Fold Them: After Saitama shows him the lone remain of Beast King, he quickly gives up and begs to be spared.
• Overshadowed by Awesome: While he was defeated by Genos, it bears repeating that Genos was and is S Class in power. Best exemplified in his "battle" with Marshall Gorilla, a monster who took down an A Class hero with ease, where Armoured Gorilla killed him with one punch.
• Robo Speak: He's just faking it because he thinks it sounds cool.
• Sole Survivor: He's the only monster of the House of Evolution to actually survive, surrendering to Saitama after seeing him hold Beast King's eyeball.
  Armored Gorilla: "Umm...I'm sorry, I'll answer all your questions, so please spare my life."

Kamakyuri

Kamakyuri

Voiced by: Yoshiaki Hasegawa (JP), Kyle Hebert (EN)

Debut: Chapter 7 (Webcomic & Manga), Episode 2 (Anime)

Disaster Level: Tiger

A praying mantis-like mutant. He is the first to attempt to capture Saitama.

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• Alien Blood: He bleeds green.
• Curb-Stomp Battle: His "fight" against Saitama is over as fast as it started.
• Brain Monster: His brain is visible, as it's in a glass dome on his head.
• Evil Laugh: Has a brief laugh after breaking into Saitama's apartment.
  Kamakyuri : Heh heh heh heh !
• Informed Ability: According to Frog-Man, he's one of the strongest monsters of the House of Evolution. However, due to the brevity of his appearance, we don't get to see any evidence of this claim.
• Killed Mid-Sentence: He crashes through the roof of Saitama's apartment, tries to says his name, and Saitama kills him before he could finish that sentence. Currently provides as a trope's image.
• Off with His Head!: Saitama tears off his head from his body with a punch.
• Slaying Mantis: Looks like a humanoid mantis and is (supposedly) a dangerous monster.
• Spikes of Villainy: He has small spikes on his shoulders.
• There Was a Door: He enters Saitama's apartment by making a hole in the roof. Saitama doesn't take it very well...
• We Hardly Knew Ye: Gets killed in his third panel and he didn't get the chance to introduce himself.

Ground Dragon

Ground Dragon

Voiced by: Shinya Hamazoe (JP), Ben Diskin (EN)

Debut: Chapter 8 (Webcomic & Manga), Episode 2 (Anime)

Disaster Level: Tiger

A large mole-like mutant sent to retrieve Saitama.

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• Mole Men: He's a talking humanoid mole (although he's more mole than man, and mostly looks like a giant mole).
• Oh, Crap!: Twice; first when Saitama lays eyes on him as the sole surviving monster among the group he was dealing with, leading to:
• Screw This, I'm Outta Here: Made his exit by tunneling like a madman through the underground... but Saitama dove into the dirt and FOUND HIM...
• Tattooed Crook: He has kanji tattooed on his body.
• This Cannot Be!: His reaction to Saitama burrowing to find him
• Tunnel King: As a mole, this is naturally his primary ability. He's not good enough to escape from Saitama, though.
• You Have GOT to Be Kidding Me!: Has this reaction when he sees that Saitama managed to find him underground.

Frog-Man

Frog-Man

Voiced by: Hiroki Gotou (JP), Kirk Thornton (EN)

Debut: Chapter 7 (Webcomic), Chapter 7 (Manga), Episode 2 (Anime)

Disaster Level: Tiger

A frog mutant sent to retrieve Saitama.

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• Curb-Stomp Battle: Gets defeated along with Slugrus by Saitama so quickly, Genos didn't even notice at first.
• Oh, Crap!: Looks rather distraught when he realizes Kamakyuri has been killed.
• Ludicrous Gibs: Surprisingly, it's not Saitama but Beast King who ends up killing both him and Slugrus in this way.
• Something Person: His name is "Frog-Man".
• Tattooed Crook: Has a tattoo on his shoulder.
• Those Two Guys: He seems to form a villainous duo with Slugrus.
• We Hardly Knew Ye: Appears only in a few panels before dying.
• Yank the Dog's Chain: Somehow, he and Slugrus managed to survive an attack from Saitama himself... only to be accidently killed by Beast King a few moments later.

Slugrus

Slugrus

Voiced by: Kenta Sasa (JP), Chris Cason (EN)

Debut: Chapter 7 (Webcomic), Chapter 7 (Manga), Episode 2 (Anime)

Disaster Level: Tiger

A slug mutant sent to retrieve Saitama.

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• Curb-Stomp Battle: Gets defeated along with Frog-Man by Saitama so quickly, Genos didn't even notice at first.
• Eye on a Stalk: Being some sort of humanoid slug, he has a pair of long eyestalks.
• Ludicrous Gibs: Surprisingly, it's not Saitama but Beast King who ends up killing both him and Frog-Man in this way.
• Oh, Crap!: Looks rather distraught when he realizes Kamakyuri has been killed.
• Telepathy: Has some telepathic powers, allowing him to sense Kamakyuri's death.
• Those Two Guys: He seems to form a villainous duo with Frog-Man.
• We Hardly Knew Ye: Appears only in a few panels before dying.
• Yank the Dog's Chain: Somehow, he and Frog-Man managed to survive an attack from Saitama himself... only to be accidently killed by Beast King a few moments later.

Paradise Group

Paradise Group (in general)

A terrorist group led by Hammerhead, consisting of unemployed young men who strive to create a utopia in which work is voluntary and the unemployed receive full financial support.

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• Arc Villain: Of the titular Paradise Group Arc, later being replaced by Speed O' Sound Sonic.
• Bald of Evil: A defining trait of the Group is that every member has a clean shaved head. The iconically bald Saitama wasn't pleased when he heard about it.
• Curbstomp Battle: The whole Group was effortlessly slaughtered by Sonic and, while Hammerhead himself survived and even managed to put up a decent fight, he was still easily defeated.
• Empowered Badass Normal: They have no powers or abilities beyond that of a normal human, it all comes from their combat suits.
• Helmets Are Hardly Heroic: Admittedly, neither are they, but wearing helmets might have lead to less of them being decapitated by Sonic.
• Not-So-Well-Intentioned Extremist: Hammerhead and the rest of the group claim to be going about their destruction because they're rebelling against the corrupt elites of society, but in reality most of them (especially Hammerhead) simply don't want to have to work to get ahead in society.
• Off with His Head!: All of Hammerhead's henchmen by Sonic.
• Powered Armor: They use advanced combat suits to make up for their lack of powers.

Hammerhead (Webcomic Spoilers)

Hammerhead

Voiced by: Wataru Takagi (Japanese), Edward Bosco (English), Arturo Mercado Jr. (Latin American Spanish)

WANTED: B-CLASS CRIMINAL HAMMERHEAD

A charismatic brute who formed and leads The Paradisers. He survives the encounters with Saitama and Speed-'o-Sound Sonic, and later attempts to reintegrate into working society.

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• Ambiguous Situation: It isn't explained why he got into prison in Neo Heroes Saga, though it is left to presumed he didn't exactly get away with raving havoc in the city.
• Arc Villain: He tries to be this, but he unfortunately had to compete with Sonic.
• Bald of Evil: He's not the nicest fellow around, and there's not a single hair on his head (nor on his whole body, as seen when Saitama destroys his armor, leaving him butt-naked).
• Benevolent Boss: He holds no grudge to one of his workers for destroying the wrong building and saying how everyone makes mistakes.
• Big Bad Wannabe: Poor guy gets overshadowed by Sonic and used as a pawn for the Organization.
• Born Lucky: He is born with a very, very thick skull, which saved his life when Sonic threw a kunai to the back of his head, and later when two agents of the Organization tried to kill him for stealing the battle suits in the first place.
• Brilliant, but Lazy: He managed to create a whole gang of devoted followers and outfit them with combat suits stolen from The Organization. His motivation for doing it? He just wants to remain unemployed and get paid for slacking off.
• The Bus Came Back: Hammerhead returns in the Neo Heroes Uprising Arc, being a part of Puri Puri Prisoner's new inmate team.
• Disc-One Final Boss: Of his own arc, thanks to Sonic taking the spotlight.
• Easily Forgiven: He faces no punishment for his crimes, Saitama just says to him to go home and he is only observed by Hero Association later in the story to see what he's up to now. Subverted later in the Neo Heroes Uprising Arc, where it's shown that Hammerhead is now in prison, though he does serve a heroic cause as part of the "Puri Puri Prison Partners".
• Even Bad Men Love Their Mamas: It's by him mentioned he does have a mother, when he thanks to her for having such a tough head.
• Good Scars, Evil Scars: He has a large, horizontal scar across his nose
• Hard Head: Despite Organization's robot attacks, he survives it, even still being conscious.
• Heel–Face Turn: After the events of Chapter 12/Episode 4, he gave up on terrorism and is actively looking for an honest job. Also, in Episode 11 is seen watching the events of the alien invasion on TV with his family, while filling in a job application.
  • Subverted into Hazy-Feel Turn, when it's revealed he's in prison in Neo Heroes Saga, though now he's under watch by Puri Puri Prisoner to become a hero.
• His Name Really Is "Barkeep": Hammerhead is indeed his actual name as it's what he uses to sign legal documents.
• Ineffectual Sympathetic Villain: Even Saitama seems to have a soft spot for him, and simply destroyed his armor and told him to run instead of gibbing him like most of the villains he usually deals with.
• In the Style of: He looks like an Akira Toriyama character.
• Large and in Charge: He's over 7 feet tall, clearly towering over the rest of his henchmen.
• Large Ham: He's better at talking the talk than he is at walking the walk, that's for sure. It doesn't make him less of a threat, though.
• Naked People Are Funny: At the end of the day, Saitama destroys his suit, which leaves him butt-naked and he's treated more comically.
• "Not So Different" Remark: Saitama notes that like him, Hammerhead is a slacker by nature and wonders if he would have gone down a similar route.
• Powered Armor: Just like the rest of his Group, he wears an advanced battle suit to boost his physical strength to superhuman levels. The specific one he's wearing is an even more powerful variant, distinguished by unique flame decals emblazoned across its torso and thighs.
• Strong Family Resemblance: He really wasn't kidding when he thanked his mother for his hard head: both his mother and grandmother share his unique skull-shape.
• Super-Strength: Even without his suit, it's shown that he can take out a Tiger level monster, being capable of joining to A-Class.
• Unwitting Pawn: To the Organization, which let him steal their battle suits so he could test them in the field.
• Utopia Justifies the Means: Even if his "utopia" is just an excuse for lazy people like him to keep slacking off all day and still get paid for it.
• Villains Want Mercy: Once Saitama destroys his power suit, Hammerhead realizes he's completely helpless as well as indignantly naked, begging to be spared by saying his deeds were only motivated by the fact he wanted to get out of working. Saitama tells him to leave, with Hammerhead running away while screaming like a little girl.
• Well-Intentioned Extremist: Parodied. Hammerhead tries to invoke this trope, but it's hard to imagine a dumber, less practical goal.

Dark Matter Thieves

Dark Matter Thieves (in general)

A group of intergalactic invaders filled with some of the strongest species in the Universe led by an alien called Boros. Having already conquered several worlds in the universe, Earth is their most recent planet to plunder.

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• Alien Invasion: They attack the planet Earth, and likely would've conquered it had it not been for the efforts of Saitama and the other heroes.
• Aliens Are Bastards: They have zero qualms about annihilating entire populated cities down to rubble.
• Arc Villain: They - especially their lord - serve as the main enemies for the Alien Conquerors Arc.
• Ominous Floating Spaceship: They travel to Earth in one of these, which they then use to blow up most of City A.
• Outside-Context Problem: Before and after their introduction, all Monsters in the series at least originated from Earth, either as altered humans, artificial beings or strange yet naturally occurring species. The fact the Dark Matter Thieves are aliens means they have nothing in common with other villains, having come from their own worlds which likely follow different rules of biology and setting. No-one saw them coming, save the soothsayer who predicted "The Earth is in Trouble!" and even then she may not have been referring to the aliens. And Lord Boros is so powerful, no-one other than Saitama is capable of standing up to his planet-busting power. The only other being to be more mysterious and dangerous than them is God, whom nothing concrete is known about.
• Space Pirates: They appear to be this, being a loose assortment of mercenaries and supervillains from different planets, attacking and pillaging their way across the universe. Boros outright refers to his forces as being a "pirate band".

Lord Boros

Lord Boros

Voiced by: Toshiyuki Morikawa (Japanese), Chris Jai Alex (English), Dafnis Fernández (Latin American Spanish)

Debut: Chapter 36 (Webcomic), Chapter 32 (Manga), Episode 10 (Anime)

Disaster Level: Above Dragon

ESTIMATED DISASTER LEVEL: ABOVE DRAGON

Click ^here to see his unleashed form.

Click ^here to see his Meteoric Burst form.

A galactic ruler, who, just like Saitama, is extremely powerful and can defeat any opponent, but soon grew bored when he believed there was no one left worth fighting. When a prophet tells Boros that there is someone who could give him an enjoyable fight on the far away planet of Earth, he travels there to battle this prophesied warrior.

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• Affably Evil: He's nothing but polite to Saitama in their interactions. While he's supremely confident in his abilities he's also respectful to Saitama for being able to take what he can dish out, and graciously accepts his defeat. It's almost enough to make one forgot that he's a Galactic Conqueror who has laid waste to numerous planets, intended to do the same to Earth and attempted to destroy all life on the planet just to kill Saitama.
• Affectionate Parody: His character is almost entirely shout-outs to various Dragon Ball characters like Goku and Piccolo, so he's an Affectionate Parody of the series as a whole.
• Alas, Poor Villain: Despite Boros' murderous and imperialistic ways, Saitama can't help but relate to his struggle for fulfillment. Boros' life had been so empty until he faced Saitama in battle, but it ended up killing him anyways. Saitama departs the broken spacecraft with a solemn expression on his face, as if he begrudgingly respects the intergalactic menace.
• Aliens Are Bastards: He orders his ship to level A-City completely. Why? Because it was there, and he had nothing better to do.
• Ambiguous Situation: What actually killed Boros is subject to debate. Throughout the fight he's referring to the energy he's projecting as something similar to his own life force. Culminating in throwing all his energy into his final move, the Collapsing Star Roaring Cannon. While it's obvious that Saitama's "Serious Punch" did some damage, he was durable enough to survive it. It's possible that Boros may have been intending to kill himself just so he could secure the win.
• Anime Hair: To go with the DBZ parody, he has spiky hair with bangs that frame his face.
• Arc Villain: Of the Alien Conquerors arc, he is the leader and most powerful member and therefore gets the most focus from the entire group.
• Aura Vision: He can literally see Saitama's power via an aura.
• Bad Boss: He isn't seen abusing his underlings, but he also had no concern trashing his ship while fighting Saitama, even when his underlings were still on it.
• Battle Aura: Have you guessed he's the DBZ parody yet? It's so powerful that it destroys the area around him whenever he moves.
• Be Careful What You Wish For: He really wanted an exhilaratingly powerful opponent to fight, and he got one. Unlike most examples, he's not bothered by getting more than what he bargained for.
• Blood Knight: He really, really wants a good fight.
• Curb-Stomp Battle:
  • On one hand, Boros is clearly capable of delivering these, as his character somewhat mimics a darker version of Saitama. His Meteoric Burst form is specifically tailored to deliver this, as Boros only uses it to finish fights quickly.
  • On the other hand, it's also clear that he's on the wrong side of this trope while fighting against Saitama, with all his attacks do nothing against him. Lampshaded by Boros himself in a melancholy sort of way while dying after a vicious one-sided battle against Saitama.
  Boros: You lie. You had strength to spare. I never stood a chance. It wasn't even a battle. So much for prophecies. You were too strong... Saitama...
• Curb Stomp Cushion: Granted, even after everything Boros throws at Saitama, he can't lay a scratch on him. However, up until Cosmic Fear Garou, he's the only one who can give Saitama anything resembling a fight. Heck, Boros is capable of sending Saitama to the moon, something that even Tatsumaki, a rank 2 S-Class hero, unable to do during their fight.^note She claims to lift Saitama with enough power to launch him into space, yet she can't even lift Saitama more than a meter above the ground.
• Cyclops: Only has one eye — on his face at least, see Eyes Do Not Belong There below.
• Dangerous Forbidden Technique: Meteoric Burst, a Super Mode that amps ups his already impressive strength and speed but at the cost of putting tremendous stress on his body similar to anaerobic exercise. He usually only uses it to finish fights quickly.
• Disc-One Final Boss: He's the last major enemy faced in the first season of the anime. And after his death in the manga and webcomic, no enemy except Awakened Garou gives the same level of performance.
• Evil Counterpart: To Saitama as he is basically "a villain for fun". Both of them are incredibly overpowered to the point where they lose interest in their later battles, and search for a Worthy Opponent. Saitama does that by being a hero for a hobby. As for Boros, Saitama put it best upon hearing his reason for attacking Earth...and punching him for it.
  Saitama: Are you stupid? You can't just go attacking other planets just to liven up your boring life. Even telemarketers wouldn't think of that.
• Evil Is Bigger: He's a bit bigger in height than Saitama.
• Explaining Your Power to the Enemy: Boros does this in a short break between his fight with Saitama, namely how he has the best Healing Factor out of all the species from his planet. He demonstrates this by regrowing the arm that Saitama managed to tear off.
• Expy: He's a parody of Freeza from Dragon Ball. An Evil Overlord with a big battleship, a Quirky Mini Boss Squad and restrictive forms who is acting on The Prophecy. His armor and various forms in turn are based on Saiyans in general and Brolly in particular, with his spiked hair and his heavy emphasis on long, baggy white pants, and armor that is a power limiter. He even grows his spiked hair longer in his "most powerful form", similar to Super Saiyan 3. And much like Super Saiyan 3, the form is explicitly taxing on his body, forcing him to only use it to end fights quickly due to how rapidly it drains his energy.
• Eye Beams: Shoots his energy blasts out of the eye on his chest.
• Eyes Do Not Belong There: A big eye on his chest.
• Face Death with Dignity: Accepts his loss against Saitama with dignity, having a civilized talk with the man about everything before dying, and acknowledging he never really had a chance against Saitama.
• Galactic Conqueror: He claims to be the ruler of many planets.
• Good Thing You Can Heal: Thanks to his regenerative powers, he survives multiple punches from Saitama.
• A Good Way to Die: How he feels about his loss against Saitama, since it was what he always wanted: a battle against a Worthy Opponent.
• Graceful Loser: He takes his defeat quite well since he got the challenging opponent he wanted.
• Healing Factor: Apparently has the best of his entire species. Because of it, he's the first villain to take multiple punches to kill, capped off with a Serious Series punch, and even then he lingers long enough to deliver a final speech before kicking it. He even manages to almost instantly pull himself together from a barrage that reduces everything but his eye to a thin red paste. It's even implied that the reason he died from the Serious Series punch was simply because he had used up all his energy firing off his final Wave-Motion Gun and didn't have any left to heal.
• Humanoid Abomination: At first, Boros looked more human and had a steel-plated looking armor with a skull-looking ornament. This humanoid form contains enough power to threaten a whole planet. His design was later changed by Yusuke Murata in order to look more alien.
• Invincible Villain: Not so much in the series itself, but he was alluded to being the final boss of ONE's earlier work "Sun Man" where he was far too powerful for the hero to defeat. Also deconstructed, as a lifetime of easy victories prior to meeting Saitama made him numb to any sense of accomplishment.
• Ironic Echo: At the height of his battle with Saitama, you can hear his heart beat in a way that mirrors Saitama's mole-people fantasy from the first episode.
• Kamehame Hadoken: His Collapsing Star Roaring Cannon, which fits in his being an Expy of Dragon Ball characters. He also has a weaker variant that vaporize whole cities.
• Knight of Cerebus: His entrance into the story shifts the light-hearted nature of the manga a little. Just a little, though. Oh, and he's the first villain to survive a normal punch from Saitama. Subverted when, as he lays dying, he accuses Saitama of not fighting seriously the whole time, although his arc still changes the mood of the story for the darker due to the sheer devastation it causes.
• Lightning Bruiser: The strongest opponent Saitama had faced at that point, strong enough to kick Saitama to the Moon and fast enough that the shockwaves from moving around were wrecking his ship, and durable enough to survive an extended fight with Saitama's Normal Series.
• Mr. Fanservice: He is very muscular, attractive despite being a Humanoid Alien and gets a lot of chest and lower back shots due to technically fighting in the buff.
• "Not So Different" Remark: As Saitama understood, Boros is also a powerful being who, after becoming the strongest being in his home planet, fell into a depression because there was no one left worth fighting.
• Omnicidal Maniac: He destroyed most things in the galaxy all because he was bored of not having a Worthy Opponent and attempted to threaten the entire Earth all so he could beat Saitama.
• Person of Mass Destruction: He does more unintentional damage to his own city-sized spaceship while fighting Saitama than everything the S-Class heroes hurl at it deliberately. He also claims his ultimate attack could wipe out all life on the Earth's surface.
• Powered Armor: His armor channels the powers he was born with, and also acts as a Power Limiter. Destroying it—which Saitama does with his first blow — just makes his power go out of control, energy wise.
• Power Makes Your Hair Grow: In Meteoric Burst, making him look like a Super Saiyan 3.
• The Prophecy: The entire reason he came to Earth? Some alien prophet predicted there'd be a worthy equal to be his opponent for him there. He finds his opponent alright, but Saitama is in his own league. But Boros doesn't mind, because he got the duel he dreamed of.
• Pulling Themselves Together: He gets punched into an eye and a smear of blood, thanks to Saitama's Consecutive Punch Combo, and manages to pull off this trope by sheer strength of will.
• Rank Scales with Asskicking: He's the leader of the alien invaders and is naturally the strongest member.
• Rubber-Forehead Aliens: Ironically the only non-human things about his looks are his blue skin, pointy ears, sharp teeth, and single cyclops-like eye.
• Super Mode: His "Meteoric Burst" form. It is Boros' trump card which he resorts to when he wishes to settle a fight quickly. He uses his latent energy to boost his body to speed and power beyond its limit, at the cost of putting immense burden on his body and even shortening his lifespan. This also completely changes his appearance.
• Superpower Lottery: Boros was gifted with superpowers since the beginning and vastly increased his powers with time and experience. He claims that he in particular, possesses regeneration, physical ability and latent energy that far surpasses others, including members of his race.
• Super-Speed: Boros has immeasurable speed and agility, as he was able to keep up with a casual Saitama. He uses the latent energy shunted from his body as a means of propulsion, making him so fast to the point that his path of movement often zig-zags, and anything he touches while moving at this speed instantly evaporates.
• Super-Strength: Boros displays extreme amounts of strength during his fight against Saitama. He was also able to knock Saitama through several massive pillars within his throne room with only one punch, the alien's various strikes easily damaging the place. And then there's the fact he kicked Saitama to the moon hard enough to leave a crater on impact.
• Super-Toughness: Boros is shown to be amazingly resilient, to the point of being the first opponent of Saitama to survive, after being hit directly by his punch, despite having his full powers sealed by his armor. After releasing his power, another punch from Saitama only tore off his arm, and he was barely inconvenienced by it. And in Meteoric Burst, a direct punch to his chest causes Blood from the Mouth and sends him flying and stumbling to get up, but the fact remains he's still in one piece. It takes Consectutive Normal Punches in order to finally be reduced to Ludicrous Gibs.
• Sympathy for the Devil: Yes. This is how Saitama feels for him.
• Theme Music Power-Up: Boros outright borrows Saitama's theme to do this.
• Victory Is Boring: The entire reason he became a galactic conqueror was in the hopes that one day, he'd find an enemy worth fighting.
• Villainous Valor: During the later part of his fight against Saitama even when it becomes clear that all of his attacks up until this point have done no damage, he continues to use Meteoric Burst despite the massive strain it puts on his body, and even after he gets pulverized completely he pulls himself back together with visible effort and defiantly declares that he will defeat Saitama while preparing his ultimate attack for one last stand despite all the damage he's taken so far.
• Villain Respect: Boros is so far, the only villain who actually took Saitama very seriously, knowing just how strong he was with a single glance. He is also the only villain who gives massive respect to Saitama, viewing him as a Worthy Opponent. Even when he loses, Boros doesn't mind because Saitama gave him the exciting fight he always wanted.
• Volcanic Veins: Appears on him when his power-limiting armor is broken, letting his immense energy run loose. He then gets what amounts to a "color-inverted" version when he uses Meteoric Burst, along with a Power Up Full Color Change — that is, the parts of his body that used to be dark and non-glowing are now glowing a bright white, while the formerly glowing veins now seem to be glaringly dark in comparison. Here's how the end result of Meteoric Burst looks.
• Wave-Motion Gun: His Collapsing Star Roaring Cannon, which channels all his energy into a planet-killing beam, though the exact specifics of it vary: the manga states this attack would scorch the planet's surface of all life, while the anime has him state it would blast the whole planet itself to hell.
• World's Strongest Man: One of the two strongest non-Saitama character in the series, with strength, speed, durability, and energy projection several orders of magnitude above the strongest S-Class heroes and Dragon-class monsters; with the other being Awakened Garou. Much like Frieza from Dragon Ball Z, he doesn't appear to have ever had to train or work for his power. Boros is as strong as he is naturally and actually has to suppress his true strength so that he doesn't die from overexertion.
• The Worf Barrage:
  • He immediately proves how he's on a completely different level compared to the previous antagonists in the series when he gets back up after getting punched by Saitama. It's a downplayed example though since he still took quite a bit of damage from it.
  • He's later on the giving end of a Worf Barrage when his ultimate attack, Collapsing Star Roaring Cannon, is blown away by Saitama's Serious Series: Serious Strike.
• World-Wrecking Wave: Implied to be the capabilities of his Finishing Move Collapsing Star Roaring Cannon, as the manga states that the attack would wipe out the planet's surface, not destroy the whole planet.
• Worthy Opponent: He seeks this, and Saitama pretends to treat him as one - Saitama tries to comfort him as he dies, mourns over his last breath, and in the anime expresses disgust when he fights a Dragon level threat the next day that can't also No-Sell his typical One-Hit Kill. Saitama purposely gave Boros an exciting fight, because he sympathized with him and knew exactly what it felt like to be so powerful that nothing is exciting anymore. But it turns out to be a subversion; as he dies he admits he knew Saitama was holding back and wasn't fighting seriously the entire time. That said, Saitama does acknowledge him as his strongest foe.

Melzargard

Melzargard

Voiced by: Kōki Uchiyama (Japanese), Vic Mignogna (anime), Kellen Goff (A Hero Nobody Knows) (English), Jorge Ornelas (Latin American Spanish)

Debut: Chapter 34 (Webcomic), Chapter 31 (Manga), Episode 10 (Anime)

Disaster Level: Dragon

ESTIMATED DISASTER LEVEL: DRAGON

One of Boros' three generals. He is a shapeshifting and regenerating alien with five separate personalities shared in one body.

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• Achilles' Heel: Each head has a small marble-like brain which allows them to regenerate endlessly. If a marble is destroyed, the associated head melts instantly, and Melzargard dies once they're all destroyed. This is mitigated somewhat by the fact that he has multiple heads and can freely move his brains within his body. However, his regeneration always begins with his heads, meaning that the brain can be easily found if his body is completely destroyed and forced to regenerate from scratch.
• Catchphrase: "That is good!"
• Damage-Sponge Boss: While his attacks are extremely damaging to lesser beings, he would be a nonthreat if it weren't for his regeneration. His whole fighting style is based around frustrating adversaries with his survivability and forcing them to overcommit to offense, leaving themselves open for a devastating counterattack.
• From a Single Cell: He can be reduced to a pile of chunks, but as long as his brains survive he can rebuild himself in seconds.
• Hypocrite: He constantly insults the Heroes for being fragile targets, ignoring the fact he would have been killed instantly by an A-Rank Hero if not for his regenerating abilities.
• Lovecraftian Superpower: He can freely control the shape of his body, from separating into one body for each head, merging all of his heads and bodies into a single form, and shapeshifting his limbs into any weapon he needs.
• Multiple Head Case: Each head possesses a different personality and speech pattern. One speaks in broken, simplistic language; another is analytic of things happening around Melzargard; another one is violent and suggests killing everything; one only praises the other heads by saying their ideas are good; and the final one seems to be in charge, taking action based on what the others say. It should be noted that the fewer heads Melzargard has, the more developed its speech patterns are.
• Nightmare Face: With all five heads combined, it has stacked pairs of eyes and multiple layers of teeth.
• Oh, Crap!: Gets an amazing one when Metal Bat grabs one of his brains.
• Puzzle Boss: His body can regenerate endlessly as long as at least one of his brain cores remains alive, but it's not as simple as just destroying his heads, as the cores can be freely moved around his body and out of harm's way. The way to beat him is to annihilate his body entirely, and then destroy the brains in the brief moments before the regeneration can occur. Since most S-rank heroes tend to favor the "beat the shit out of it until it dies" strategy, it ends up taking them quite some time to figure this trick out and effectively fight back against the alien.
• Shapeshifter Weapon: He can form all kinds of weapons, including axes, hammers, spikes or just a mass of tendrils.
• Smug Snake: Repeatedly taunts the S-Class heroes on how their attacks are useless due to his regeneration, only to slowly lose control of the fight once they figure out his weakness. He later claims that the S-Class heroes would die instantly if he focused solely on attacking them, only to be shocked to find that Bang wasn't hurt from his attack. It's also noticeable that he only lands two hits on his whole fight (one on Ia-Ian and one on Silverfang), and the latter doesn't even do any actual damage: despite his claims about his strength, he's only able to get beaten over and over again by the heroes until they find a way to kill him.
• Unskilled, but Strong: What's mainly dangerous about him is his incredible attack power and how his regeneration allows him to shrug off most attacks.
• Villainous Breakdown: With each head he lost, he lost his head some more, going from a Creepy Monotone to a rambling and cackling lunatic.

Groribas

Groribas

Voiced by: Shinya Hamazoe (Japanese), Bill Rogers (English)

Debut: Chapter 36 (Webcomic), Chapter 32 (Manga), Episode 10 (Anime)

Disaster Level: Dragon

ESTIMATED DISASTER LEVEL: DRAGON

One of Boros' three generals, and allegedly the strongest fighter in the Dark Matter Thieves besides Boros himself.

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• Acid Attack: He has acidic breath, although he does not get a chance to demonstrate this before Saitama literally knocks his block off.
• Elite Mook: According to Geryuganshoop, he was the top fighter in Boros' army. However, given that he was unlucky enough to run into Saitama, we don't know what he really is capable of.
• Eyeless Face: It's just one big mouth.
• Hollywood Acid: His breath which he claims can melt anything.
• Killed Mid-Sentence: Has his head punched off by Saitama while he was in the middle of bragging about his acid breath.
• Lost in Translation: His Japanese name "Guroribāsu" is a portmanteau of "guro" (meaning gross) and "reverse" (meaning to vomit), meaning his name should be Guroreverse. That name is pretty mouthy for English speakers, so they just left out the pun in translation.
• Smug Snake: He gets pulverized by Saitama just as he was bragging about how powerful he is.
• We Hardly Knew Ye: When you run into Saitama it tends to happen.
• Xenomorph Xerox: He's an alien with an Eyeless Face, More Teeth than the Osmond Family and additional mouths who can emit acid, all of which are very reminiscent of the Xenomorph.

Geryuganshoop

Geryuganshoop

Voiced by: Hiroki Gotou (Japanese), Brian Beacock (English), Emmanuel Bernal (Latin American Spanish)

Debut: Chapter 36 (Webcomic), Chapter 32 (Manga), Episode 11 (Anime)

Disaster Level: Dragon

ESTIMATED DISASTER LEVEL: DRAGON

One of Boros' three generals. He is a telepathic and telekinetic alien in charge of the spacecraft's controls.

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• Bad Boss: Saitama is not affected by his gravity warping in any way, but we do see a couple of unfortunate mooks that happened to be within range get squished like pancakes, showing that Shoop is not all talk. And that he doesn't particularly care about his allies.
• Boom, Headshot!: How he dies. Saitama flicks a rock through his head.
• Death by Irony: He attacks Saitama by telekinetically hurling lots and lots of rocks at him, to no effect. Saitama kills him by tossing just one rock at him.
• Gravity Master: Using his telekinesis, he can increase the force of gravity. This would have been impressive if his opponent were anyone but Saitama, who isn't even affected by it.
• Mind over Matter: Claims to be the most powerful telekinetic in the universe. Along with having enough power to create gravity wells, he can nullify friction so that projectiles launched by his powers can accelerate at sub-light speeds.
• Mission Control: Seems to be his role on the alien ship.
• Octopoid Aliens: Saitama even confuses Geryuganshoop for a literal octopus upon first sight of him.
• Oh, Crap!: Continually as every attempt to stop Saitama fails. Has a more comical one when Saitama trolls him by saying he's lost and then going in the opposite directions Geryuganshoop gives him.
• Smug Snake: Calls himself the greatest telekinetic in the universe. Saitama is unimpressed, though, and his shown feats are not even on level with those displayed by Tornado of Terror (admittedly, he may be holding back to avoid at least obliterating his own ship if not his allies).
• Squishy Wizard: He is very good at annihilating most opponents before they can get into melee range, but a simple pebble splits his head in twain. It should be noted that the pebble was thrown by Saitama, but it still gives off this impression.

Monster Association

Monster Association

The massive group of monster villains that serve as the main antagonistic faction in the Human Monster Saga.

See their entry on their page.

The Organization

The Organization (in general) (WEBCOMIC SPOILERS)

A mysterious technological faction seemingly made up of robots. Their known members so far include two unnamed robots who attempted to kill Hammerhead for stealing battle suits from them, the Machine God G4 that was sent to fight King, the Machine God G5 that was sent to join the Monster Association, and the Machine God Mirror that wreaks havoc during the Neo Hero Showcase arc.

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• Arc Villain: A few of the stronger members of their ranks sometimes serve as this for short arcs. It seems, however, that the Organization as a whole is stepping into the spotlight full-time in the current Neo Hero storyline.
• Greater-Scope Villain: From what was told, their numbers in members are quite big and serve some role in story every now and then, whether as an Arc Villain or The Man Behind the Man to another Arc Villain, but so far they remain as this, especially for the Neo Heroes saga.
• The Man Behind the Man: They were using Hammerhead to test out their battle suits. They are also strongly hinted to be behind the so-called Neo Heroes and therefore may or may not be pulling Fuzzy's strings.
• Mecha-Mooks: It appears that the Organization is completely compromised by robots and cyborgs. In the latest webcomic chapters, they have sent massive amounts of robots to attack and invade the cities.
• Nebulous Evil Organization: The above description is everything we know about them. Goals? Leaders? Membership? Who knows??
• Not-So-Harmless Villain: While even a few of their stronger members get totaled often, others cement the Organization as a huge threat when they murder Doctor Kuseno and their armies lay waste to entire cities.
• Powered Armor: The Organization has developed many versions of battle suits for testing. This is a major hint that they have a hand in how the Neo Heroes Association runs things.
• Technologically Advanced Foe: The Organization seems to have more in technological superiority than the rest of the factions.
• The Unseen: The leaders have yet to be seen or even mentioned.

Unnamed members

Two robots who are the first members of the Organization to appear.

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• Bond Villain Stupidity: They don't bother to check if Hammerhead is really dead, which allowed him to survive.
• Brain Monster: One of them has his brain stored in a glass dome on his head.
• Cyber Cyclops: One of them is a robot that seems to only have one red eye.
• Killer Robot: What they seem to be. They fail to kill Hammerhead though, but they don't know that.
• Out-Gambitted: As it turns out, Hammerhead stealing and using their combat suits was part of their plans all along. In reality, they deliberately allowed him to do so because they wanted to collect real battle data.
• No Name Given: For now at least, we were not given any names for them.
• Those Two Guys: A pair of villainous robots that appears to work as a duo.
• You Have Outlived Your Usefulness: They only let Hammerhead alive after he stole their combat suits so he can test those for them. After his defeat and the destruction of the suits, they come to kill him since he's no longer useful to them. Unbeknown to them, he actually survives their attack.

G4

G4

Voiced by: Tarō Kiuchi (Japanese), Chris Tergliafera (English)

Debut: Chapter 42 (Webcomic), Chapter 37 (Manga)

Disaster Level: Demon

ESTIMATED DISASTER LEVEL: DEMON

A giant knight robot from the "Machine God" series, sent by the Organization to test King's combat ability.

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• Adaptation Name Change: Was named "Zsimov" in the original webcomic.
• Arc Villain: Of the King's arc, ready to collect his data. Though it's actually Genos who takes the robot on.
• Beam Spam: G4's true form does this to Genos in their fight.
• BFS: Wields a massive sword that can be retracted from its giant chakra wheel on its back.
• Cyber Cyclops: Its Mecha form has a single eye.
• Mecha: It turns out to be a small robot piloting a large mecha.
• Requisite Royal Regalia: It wears a fur cape, has a giant crown and is decorated with shiny ornaments.
• Sadistic Choice: It gives King an ultimatum; if he does not fight, it will kill 10 civilians each minute.

G5

The next model in the Machine God series, sent to join the Monster Association. See Monster Association page.

Mirror

Mirror

Debut: Chapter 128 (Webcomic)

Disaster Level: Dragon

A model in the Machine God series with multiple arms.

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• Arc Villain: Of the Neo Hero Showcase arc, he's one of five Dragon level monsters that poses a threat across the globe.
• Multi-Armed and Dangerous: He has multiple arms and is strong enough to easily defeat 3 A-Class heroes.
• Underestimating Badassery: He assumes Saitama is a weakling due to his appearance and hero name. He doesn't get to live to regret it.

Machine God Body, Machine God Ray and Machine God Tech

Three models of the Machine God series like G4, G5 and Mirror before them but this time, they are sent against Kuseno to kill him.

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• The Bad Guy Wins: For all of Genos best attempts, he fails to save Kuseno from them. He goes ballistic for it.

Tsukuyomi

Tsukuyomi (in general)

An enigmatic psychic research organization consisting of scientists and esper agents who gained their abilities through artificial means, such as experimentation on natural-born psychics.

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• Arch-Enemy: Tatsumaki will do anything and everything in her power to screw them over and destroy them. She would rather save Psykos's life than let her be taken by them.
• Malevolent Masked Men: The esper agents typically wear creepy white masks with smiles painted on.
• Mind over Matter: Artificially obtained, however.
• Well-Intentioned Extremist: They claim to want to advance humanity as a whole by gifting psychic abilities to those that have none.
• Would Hurt a Child: They cruelly tortured and experimented on Tatsumaki when she was a child and refused to let her and the even younger Fubuki see each other.

Apollo

A Tsukuyomi agent and artificial esper who arrives at the Hero Association to collect the imprisoned Psykos for his own organization.

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• Arc Villain: He tries to be this for the Psychic Sisters arc but is quickly curb-stomped by Tatsumaki and forced to flee when she decides to take her rage out on Saitama.
• Big Bad Wannabe: He acts calm, collected and smug, claiming that natural espers are inferior to artificial ones like himself and blasting a restrained Psykos when she lashes out upon his approach. He even believes himself superior to Tatsumaki and thinks he's got her trapped when he contorts her body in midair. He gets effortlessly Out-Gambitted by her, has a poison needle launched through his hands and his eye, gets smashed and trapped by an accumulation of metal from all directions, and utterly fails to steal Psykos away. He only escapes because Tatsumaki shifted her priorities to Saitama.
• Bullying a Dragon: He's lucky he even survived an encounter with the Tornado of Terror, let alone escaped capture and interrogation. Even she remarks that she's surprised he wasn't compacted to death by the metal sphere she crushed him within.
• Curb-Stomp Battle: Really shouldn't have picked a fight with Tornado of all people.
• Disc-One Final Boss: He's humiliated and disfigured by Tatsumaki, then he flees with his tail between his legs long before the arc is over.
• Eye Scream: With his own poison drug being turned into a needle, no less.
• Out-Gambitted: Tatsumaki saw right through every single one of his tactics and played him like a fiddle.
• Pragmatic Villainy: Releases every Demon level monster in the cell block to cover his and his partner's escape.
• Screw This, I'm Outta Here: He dives into the getaway car as soon as Tatsumaki is preoccupied.
• Smug Snake: He seriously believes he's better than all natural espers in the world, including Tatsumaki, and thinks she cannot possibly get out of having her spine contorted or find a way to save her sister from the poison in her system. He gets proven wrong about all of the above almost immediately.

Tsukuyomi Spy

An unnamed member who infiltrated the Blizzard Group and turns out to be partnered with Apollo.

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• Curb-Stomp Battle: He gets embedded in the wall when he tries to run - a favorite tactic of Tatsumaki's.
• The Mole: He was undercover in the Blizzard Group for a short time, considering that Mountain Ape referred to him as "the new guy."
• No Name Given: So far, he remains unnamed, even though he was a member of the Blizzard Group and his partner in Tsukuyomi was named.
• Screw This, I'm Outta Here: He takes over the wheel because Apollo is dealing with his Eye Scream.

Ninja Village

Ninja Village (in general)

A secret institution located in an unknown location whose sole purpose was the training of highly skilled ninja assassins. It is the hometown of Speed-o'-Sound Sonic, Flashy Flash, Hellfire Flame, and Gale Wind.

The village was first founded by "That Man", the "Ninja Village Leader", formerly known as Empty Void, but it is no longer in operation thanks to Flashy Flash's purge.

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• Always Male: According to Flashy Flash, all of the members are male.
• Arc Villain: That Man serves as this for the Ninjas arc, specifically for Sonic and Flash.
• Department of Redundancy Department: Every single ninja from the village has a redundant name.
• Driven to Suicide: The Ninja Village defies this for the trainees, if they attempt to do this to free themselves from the hellish training, through the specialized medicine they injected into them.
• The Insomniac: As part of the training curriculum, a day for them consists of 72 hours while only getting 6 hours of sleep.

Ninja Village Leader (WEBCOMIC SPOILERS)

Ninja Village Leader / Empty Void

The (formerly) unnamed founder of the secret Ninja Village.

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• Adaptation Expansion: Like many plot threads when transferred from the webcomic to the manga, his role and character were expanded, being given a name as one of the most notable since the webcomic insisted on keeping him nameless.
  • Also, unlike in the webcomic, where he is dealt with off-panel by Saitama, the manga has him face off against Flash and Sonic, defeating them both via the mysterious cube, and acting as a conduit for God to communicate with.
• Adaptation Relationship Overhaul: The manga introduced the fact he used to be one of Blast’s partners before they had a falling out and battled to the death, in the webcomic Void was just one of several big-name foes Blast targeted to put them out of commission, no stated relation.
• Arc Villain: The Ninja Village arc focuses on his ominous return from a 15 year coma.
• Asskicking Leads to Leadership: The strongest and deadly ninja known to the world, and is the founder of the Ninja Village that puts children through hellish training to become assassins.
• Body Horror: Due to his interest in grafting the bodily remains of his fallen enemies onto his own body, his own appearance is monstrous as seen in the page image. The manga adds monsterization to the mix.
• Came Back Strong: He is apparently even more powerful and dangerous now than he was 15 years ago. If only he had just avoided Saitama...
• Curb-Stomp Battle: He had to run from Blast, and he was still more than injured enough to be put in stasis for 15 years. Also, he gets off-paneled by Saitama at the end of the webcomic arc when he tries to attack him from above.
• Death from Above: He tries this on Saitama. It goes as well as you might expect.
• Given Name Reveal: The manga introduced him with a name right away: Empty Void, keeping the same redundant name theme as all other ninjas from his village. Manako even comments on the rendundancy.
• Greater-Scope Villain: Any time Sonic or other ninjas attempt to cause trouble for the Heroes in the arcs before he shows himself, you can thank this guy for raising them that way.
• No Name Given: He is never referred by name in the webcomic, the most consistent way others refer to him is simply by "That Man". In the manga, he enforced this trope. After becoming a Mysterious Being, he discarded his human name and wouldn't allow anybody to use it.
• Really 700 Years Old: He was born over 300 years prior to the series, as he was capable of longevity through the constant body grafting of his enemies.
• Was Once a Man: He used to be human, but he has since undergone a transformation into a Mysterious Being.
• We Used to Be Friends: Back when he was human, he and Blast were friends and partners who searched for God's cubes together. Flash suspects that this was why Blast didn't just kill Void when he became a Mysterious Being: he didn't have the heart to.
• What Happened to the Mouse?: What happens to him after he gets punched an indeterminate distance through the ground by Saitama is anyone's guess.
• The Worf Effect: 15 years prior to the story, he was rendered in a coma from Blast, showing that not even the Ninja Village Leader's own immense power and skill is enough to match him; and after all the build up from his return, even remarking that he is stronger than ever before, the guy can’t even amount to an actual on-panel fight for Saitama in the webcomic, he is dealt with completely off panel, in the end he was used as a means to an end: giving Flash and Sonic new abilities through getting his weapons and scrolls.
  • In the manga however, he does get to fight against Flash and Sonic and proves to be just as dangerous as described. He also holds one of the Mysterious Cubes, which is how God imbues his targets with His power. Whether or not he will suffer the humiliation of a One-Hit Kill from Saitama, remains to be seen.
• World's Best Warrior: He was regarded as the most powerful ninja to walk the Earth.

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