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Monster Association

    In General 
https://static.tvtropes.org/pmwiki/pub/images/monster_association_anime.png
A group of monsters led by Gyoro Gyoro and Orochi that aim to destroy both the Hero Association and humanity to make a world where monsters reign supreme. They are the main antagonists for much of the Human Monster Saga (Monster Raid, Super Fight, and Monster Association arcs specifically).
  • Asskicking Equals Authority: They're ranked in importance in the Association by their power. When Garou expresses disbelief that Overgrown Rover is counted as an Executive despite quite literally being a guard dog, his Demon-level opponents reply that sentience doesn't matter in the Monster Association as long as you have the power to backup your presence. Orochi, the supposed leader of the organisation, is its strongest member by far, requiring three normal punches from Saitama to go down, and even that didn't kill him completely, thanks to his ability to regenerate. Note 
  • Always Chaotic Evil: The process of becoming a monster twists morality, rendering a person evil by nature.
  • Brotherhood of Evil: They do call themselves an "association". Although they cooperate freely, and tougher monsters may not have actual authority over weaker ones, but all do obey Orochi and Gyoro Gyoro.
  • Evil Counterpart: To the Hero Association as a whole. The organization built itself as an answer to the Hero Association after all, taking on the same principle of gathering and organizing themselves to become a better force against their enemy (in that case the heroes). They freely retake the threat levels the Hero Association has made for themselves, dividing their ranks according to their strength. Finally their lair is a multi-layered Elaborate Underground Base while the Heroes' HQ is a humongous fortified tower.
  • Legion of Doom: A disturbingly effective one at first. Apparently the Hero Association never counted on a group of monsters banding together as opposed to single minded attacks.
  • Irony: The Monster Association is led not by a monster, but rather a human disguised as one.
  • Smug Super: Most of them are pretty confident in their abilities, and are very hard to kill, unless they face an S-Class hero (and sometimes, even they have difficulty).
  • Suspiciously Similar Substitute: Some of the original monsters who appeared in the manga have an appearance and power similar to their apparent webcomic counterpart.
  • Teeth-Clenched Teamwork: They don't get along very well, and there are rules in place forbidding them from killing each other. There's also the implication that once their common enemy the Hero Association is gone, they'll devolve into fighting each other.
  • Was Once a Man: Most of them were previously humans who gained a lot of power and turned into monsters by putting into their bodies the "monster cells."
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Upper Echelon

    "Monster King" Orochi 

"Monster King" Orochi

Voiced by: Atsushi Ono (Japanese), Jason Marnocha (English)

Debut: Chapter 66 (Manga)

Disaster Level: Dragon+

https://static.tvtropes.org/pmwiki/pub/images/kaijin_o_orochi_sama.png
A powerful monster introduced during the Monster Raid arc, who seems to be the leader of the Monster Association. He is possibly a Dragon+ level threat.

He is revealed to be a figurehead for Gyoro Gyoro, and while extremely powerful, owes everything to him due to being one of his experiments.


  • Ambiguous Situation: He recognizes both Psykos and Tatsumaki in Chapter 127 before declaring, "Give me... Your blood!!!..." This could imply that he has now grown far beyond Psykos' control and seeks to absorb both of them in order to regenerate fully (and no longer be a figurehead), though when both he and Psykos try to absorb each other, she’s astonished by his will, and wonders how much control she had over him to begin with.
    • It's unclear if he is aware of God, and if the deal that God made with Psykos (as one half of Psykorochi) was extended to Orochi himself as well.
  • As You Know: For some reason, Gyoro Gyoro has to explain to him his own organization's goals and methods. It's a hint that he's not really the leader, but rather a particularly powerful figurehead that monsters can rally around.
  • The Assimilator: His Heart Element form, which is a shapeless mass of his flesh after Saitama destroys his body, can absorb other monsters and people to aide in his regeneration, and increase his power. He even tries to do this to Psykos to form another One-Winged Angel, but neither personality is in complete control.
  • Attack of the 50-Foot Whatever: He’s a horned humanoid made out of snake-like dragons, and is several stories tall.
  • Awesome by Analysis: He can immediately emulate a martial arts style just by observing them.
  • Bad Boss: Orochi ate Awakened Cockroach for losing to Genos and returning despite that. Do-S narrowly avoids the same fate after Gyoro Gyoro tells Orochi it'd be a waste to kill her after just one loss due to how useful her ability is. Orochi warns her that next time she won't be so fortunate.
  • Badass Boast: To Garou.
    As you wish, I will bestow upon you terror.
  • Badass Cape: He wears a big cape and fits him to accentuate his leadership position.
  • Beam Spam: He utilizes his smaller dragon headed tentacles from his body to rain fire from their mouths at his enemies. He also uses this in his Heart Element form by having several regenerating snake heads attack Tatsumaki from multiple angles during her fight with Psykos. Though it fails to do anything more than burn Tatsumaki a little, it does put her on the defensive enough to give him and Psykos the opportunity to merge together.
  • Big Bad: Of the Monster Raid, Super Fight, and Monster Association arcs, and the Human Monster Saga as a whole. Though Psykos is The Man Behind the Man, he is intent on betraying her and putting her in her place as of Chapter 128, however, their Fusion Dance puts that plan temporarily on hold.
  • Big Bad Ensemble: He is this with Garou.
  • Blood Knight: The only time he's him excited is an upcoming fight with a powerful opponent.
  • Body Horror: The forms he takes during his fight with Garou are terrifying. Mouths and hands appear from inside other mouths, some limbs turn into snakes and dragons.
  • Breath Weapon: He can do this from both his mouth and from the mouths of the snakes that come out from his tentacles.
  • The Bus Came Back: Despite seemingly being dead after Saitama gets a clean punch on him early on and taken out of his own war on the heroes, Orochi scrapes by and regenerates, and reintroduces himself by being the first monster to harm Tatsumaki in the series.
  • Combat Tentacles: The horns on his head serve as this, as he control them at will and make them contort like tentacles.
  • The Corrupter: Implied to have some connection with the monster cells who turns people into monsters.
  • Curb-Stomp Battle: What he inflicts to Garou.
    • On the recieving end when he tries to fight Saitama like everybody else that tries to fight Saitama. Orochi is defeated in just a single direct normal punch, and while he does put up a greater fight than most of Saitama's other opponents, his most impressive feats only delayed the inevitable without even amusing Saitama much. He does, however, get credit for regenerating after a punch that would have certainly wiped out any other monster than himself or Lord Boros (thus far).
  • Devour the Dragon: A weird case in that Psykos and Orochi both clearly consider the other to be the "Dragon" in question. Orochi interrupts the duel between Psykos and Tatsumaki intent on devouring the former to restore his body and power to greater heights, even feigning some level of weakness so that Psykos comes to him first with her intent to usurp his power before surprising her. However, Psykos' will proves too strong for him to subsume completely. The result is the two of them still fighting for dominance even as they focus on destroying their enemies.
  • Dragon-in-Chief: Although he seems subservient to Gyoro Gyoro / Psykos's control, he is far more powerful than she is and, as of his return in Chapter 128, seems ready to turn on her for his own personal gain. After all, the title of "Monster King" belongs to him rather than her.
  • Eldritch Abomination: The best way to describe him, which makes one wonder just what the fuck did Psykos do to him to turn Orochi into such a nightmarish creature. And that's before he gets serious in his fight with Garou.
  • Evil Is Bigger: As the King of Monsters, he’s one of the biggest monsters in the Monster Association, with only Centichoro and possibly Hundred-Eye Octopus dwarfing him.
  • Foreshadowing: Most powerful force of the Monster Association? Check. A bald head with various horns with blackened eyes and white pupils? Check. A former martial artist? Check. Ability to adopt martial arts from simply glancing at it? Check. A humanoid body that is capable of transforming into vastly more eldritch forms? Check. Throw in how Psykos intends for Garou to surpass Orochi as the Monster King someday, and Monster King Orochi becomes a glimpse into the true final boss of the arc, Awakened Garou.
  • Fusion Dance: The result of his and Psykos's battle for control over the other, resulting in a massive winged moth-like entity, with both personalities still clashing in the hopes of overpowering the other. This fusion ends up dealing serious damage to Tatsumaki, although admittedly she was holding back her true strength so as not to endanger innocents.
  • Glass Cannon: Relatively. His heat blasts are powerful enough to carve through miles of earth underground, warping an entire city in the process, and his various body parts have enough force behind them to briefly halt Saitama's offense, but a single direct hit of Saitama's normal punch is enough to tear him apart; not even requiring a Serious Punch like Boros did to be defeated. Granted, Orochi was punched in the face and ultimately became one of the very few monsters to survive Saitama's punches, due to surviving as a shapeless blob.
  • Horn Attack: His horns can extend and be used as weapons. One was capable of stabbing Garou clean through his body.
  • Horns of Villainy: Gyoro Gyoro notes that they were the first traits he manifested upon becoming a monster.
  • Large and in Charge: He towers over both Gyoro Gyoro and Psykos, and is the "official" leader of the Monster Association to the other monsters and the outside world.
  • Life-or-Limb Decision: During his fight with Saitama, he sacrifices several of his serpents to take punches for him.
  • Monster Lord: Large and in Charge? Check. Looks like an Eldritch Abomination? Check. Is the leader of the Monster Association? Check. Then there's his name...
  • More Teeth than the Osmond Family: Pretty much any and all points on his body that aren't his horns are gruesome, draconic teeth. Easily has more mouths than the Osmonds too.
  • Nested Mouths: He has mouths within mouths within mouths, as was seen when he eats Awakened Cockroach.
  • Non-Standard Character Design: Sort of. While this series is no stranger to scary-looking monsters, Orochi stands out because of how terrifying and inhuman he looks. This, combined with the fact that he used to be a man who abandoned humanity for power and his even more horrifying true form, has gotten people saying he looks like something out of Berserk.
  • Not Quite Dead: After being punched to pieces by Saitama, Orochi (in his "Heart Element" form) manages to regenerate the rest of his body through absorbing other monsters scurrying around the base before turning his attention to Psykos and Tatsumaki.
  • One-Winged Angel: As if he isn't monstrous enough already, he can turns his entire body into a terrifying mass of fire-breathing serpentine dragons. It says a lot that Orochi probably is the most accurate representation of Typhon in a work of fiction. He also uses a more streamline humanoid form while fighting Saitama, indicating that it may be his most powerful one. Not that it means much to Saitama.
  • Orochi: His namesake. His body seems to made up of snakes with more snakes coming out of another snake's mouth.
  • Playing with Fire: All his dragon heads can breath fire, and when they work together they can start firestorms.
  • The Starscream: In Chapter 127, he begins thirsting for the blood of both Tatsumaki and Psykos, indicating he is tired of the latter's conditioning and brainwashing and is making a move to absorb her and truly take his place as the Monster King.
  • Split Personality: The Fusion Dance between Orochi and Psykos has the personalities of the two battling for dominance while simultaneously trying to defeat Tatsumaki. Orochi has an ulterior motive - he wants to absorb Saitama to complete his revival and become the most powerful being in existence.
  • Super Speed: Don't let his bulk fool you. He's fast enough to catch Awakened Cockroach in spite of the latter's Super Speed and Spider-Sense, destroyed Metal Knight's drone faster than it could trigger its own self-destruct mechanism, and during the fight with Garou kills multiple monsters caught in the crossfire of his attacks faster than they could even react to. During his fight with Saitama, he's fast enough to dodge or use his snakes to intercept several of Saitama's punches.
  • Super Toughness: He takes all of Garou's attacks during their clash without any visible damage or even much reaction. Word of God states that he could even take a few of Saitama's punches and keep going. Indeed, even when Saitama's punch tears him apart, he manages to survive and even return with the capability to harm Tatsumaki even in a weakened state.
  • Ultimate Lifeform: Introduces himself as this to Saitama, who isn't amused.
  • Underestimating Badassery: Averted and defied, since he is one of the rare opponents who immediately recognizes Saitama as a genuine threat. With just one look, Orochi immediately deduces Saitama to be the one who killed Elder Centipede, Gouketsu as well as the truth behind the monster of the ghost town. It is unknown if this has anything to do with the fact both him and Saitama broke their Limiters and if Orochi can somehow sense it, which may explain why he was able to ignore Psykos when she called him for help.
  • Unskilled, but Strong: Garou notes that he's indeed terribly strong, but has nothing else to back it up. Massively subverted, he can actually copy any technique after a first glance.
  • Was Once a Man: According to Psykos, he was just a normal human before she turned him into what he is now, albeit one who was already on the verge of becoming a monster anyways. She just... Pushed him even further than what he would have achieved on his own.
  • We Have Reserves: When Gyoro Gyoro communicates him the defeats of some of the monsters, he simply remarks they can make more. He shows little concern for any monsters he kills while fighting Garou, either.
  • The Worm That Walks: His body is made entirely by giant snakes and dragons.
  • Worthy Opponent: Orochi gets excited at the prospect of fighting a powerful foe like Saitama.
  • Wreathed in Flames: Early in his introduction he wears a giant tattered cape, but this is set ablaze during his fight with Garou to cloak him in flame and give him an even more badass look. He's seen to still be cloaked in fire in every following appearance even after the fight.
  • You Have Outlived Your Usefulness: He thanks Psykos for feeding him so many monsters in order to make him more powerful before declaring that she's next. This is highly ironic considering she was supposed to have control over him.

    Gyoro Gyoro 

Gyoro Gyoro/Psykos

Voiced by: Takehito Koyasu (Japanese), Bill Millsap (English)

Debut: Chapter 55 (Webcomic), Chapter 66 (Manga)

Disaster Level: Dragon

https://static.tvtropes.org/pmwiki/pub/images/psykos.png
SPOILER WARNING: Click here  to see his true form.
SPOILER WARNING: Click here  to see full body.

The mysterious second-in-command of the monster association (And the organization's leader in the original webcomic) who uses telepathy to keep track of everything going on. His estimated disaster level is Dragon.

Gyoro Gyoro is revealed to be Psykos, a friend of Fubuki's from their school days. One day, she attempted to look into the future and saw something that convinced her humans were not worth saving. He has performed experiments and transformed people into monsters including the Monster King Orochi in his attempt to break the limiter, and can be considered the real leader of the Monster Association.


  • Actually a Doombot: The monster form she appears as is actually just a remote-controlled body.
  • Adaptational Badass: In the manga, Psykos is able to clash with Tatsumaki and put up something of a fight though was outmatched, until combining with Orochi's Heart Element that allowed for a One-Winged Angel form with increased power caused by absorbing other monsters resulting in the battle to turn, and Tatsumaki to be seriously injured for the first time. In the web comic, Tatsumaki's injuries came from all of the Monster Association executives ganging up on her.
  • A God Am I: Played with. After her deal with God, she still sees the latter as a superior being, while she (as half of Psykorochi) is enforcing its will as its last representative, however she still refers to herself as a star-like perfect being who may be able to become the Earth itself.
  • The Assimilator: Tries to take over Orochi’s body with her mind in control during her fight with Tatsumaki, but while it achieves a One-Winged Angel form, both personalities constantly struggle for dominance.
  • Bad Boss: As the one who comes up with all the Monster Association's plans Gyoro Gyoro is the one who interacts directly with all the monster underlings, and thinks nothing of sacrificing the weaker ones just to gather intel on the Heroes. He'll also casually feed any monster that flees in the face of a losing fight, or who are reluctant to risk themselves, to Orochi; giving them the choice of possible death by Hero or definite death by the Monster King.
  • Blasphemous Boast: Psykos refers to herself (as Psykorochi) as a "star-like perfect being" who might even be able to become one with Earth and assimilate all life in existence. Given that the webcomic shows that the Monster Association will inevitably lose, she couldn't be more wrong about her claims of perfection.
  • Boomerang Bigot: She hates humanity, seeing them as the actual monsters, but she is a human. Though given that she invited Fubuki in the past to join her in killing all those inferior humans, she doesn't really consider humans to be the same level as her and other supernaturals.
  • The Chessmaster: As the brains behind the Monster Association, he is the one who comes up with all their plans from picking the best individual matches that favor the monsters against specific Heroes, to their larger strategy of kidnapping the son of an important investor while they initially rampaged to insure the Hero Association would have to act on the monster's terms. He also sent Evil Eye and Rhino Wrestler with hundreds of other monsters to get slaughtered by the Heroes' rescue party in order to best observe them and set the matchups for the Dragon-level monsters.
  • The Corrupter: She's the one behind the monster cells and the creation of Orochi.
  • Curb-Stomp Battle: She has absolutely zero chance of defeating Tatsumaki on her own. Once she and Orochi merge together, however, they start turning this around until Tatsumaki reveals that she was holding back to avoid harming Tareo.
  • Cute Monster Girl: Her Fusion Dance with Orochi results in Psykos becoming this - at least, her upper half (when Orochi isn't taking it over).
  • Demoted to Dragon: In the manga, he doesn't seem to be the leader of the Monster Association but The Dragon to Orochi... But then he reveals that she made Orochi into what he is, so in essence he's still the true brains of the organization, just not the public face anymore.
  • Devour the Dragon: A weird case in that Psykos and Orochi both clearly consider the other to be the "Dragon" in question. Psykos is the one to initiate the Fusion Dance with Orochi fully convinced she can overpower his will, only to be shocked by just how strong it actually proves to be. The result is the two of them still fighting for dominance even as they focus on destroying their enemies.
  • Disney Death: Looks to die in her fight with Fubuki both in-universe and out but is later seen in a special made prison inside the Hero Association.
  • The Dragon: To King Orochi (Publicly, at least).
  • Dragon-in-Chief: Despite Psykos being second-in-command in the manga, she is the one who transformed Orochi into the monster king he is today.
  • Dude, Where's My Respect?: She loses it when Tatsumaki insults her for relying on Orochi and power from "God", despite how insanely strong she has become due to it.
  • Evil Former Friend: To Fubuki. Although they both were evil in the past. Fubuki grew out of it.
  • Evil Mentor: He sees Garou is on the road toward becoming a monster, and wants to help him complete the monsterification.
  • Evil Versus Oblivion: She was the oblivion in the past. When Psykos wanted to change their club's goal from Take Over the World to Kill All Humans, Fubuki was opposed because then there'd be no one left for Fubuki to look down on. The disagreement quickly became violent.
  • Extra Eyes: Opens up several more eyes all over his monster body during his fight with Tatsumaki.
  • Fan Disservice: Her Fusion Dance with Orochi allows her to assume a giant Cute Monster Girl form when she manages to force her personality to the forefront, but she's still attached to a monstrous Eldritch Abomination and that sexy form has a habit of deteriorating into a mass of tumor-like flesh growths as the two personalities struggle for dominance.
  • The Force Is Strong with This One: He senses a huge potential in Garou, and this raises his interest in him. Too bad for her, Garou is developing much faster than she expects.
  • Fusion Dance: The result of Orochi's and Psykos's battle for control over the other results in a massive winged moth-like entity, with both personalities still clashing in the hopes of overpowering the other. This fusion ends up dealing serious damage to Tatsumaki, although admittedly she was holding back her true strength so as not to endanger innocents.
  • Go Mad from the Revelation: Attempting to prove herself over Fubuki in her human days, she trained herself to look into the future. Whatever she saw there made her lose her mind, convinced that humanity deserved to be exterminated.
  • Gravity Master: Tries to flatten Tatsumaki by increasing the gravity around her to 300x normal. Tatsumaki just casually uses her own power to negate it.
  • Humans Are the Real Monsters: What she believes.
  • Hypocrite: She despises humanity, turned several people into monsters and leads an organization composed of monsters, but she never turned herself into one until forced to the Godzilla Threshold fighting Tatsumaki. Although as a super powered psychic, she does already consider herself above human.
  • Inferiority Superiority Complex: She seems to have retained this from her days in high school, feeling as though she was never given the acknowledgement she deserves by Club President Fubuki. When Fubuki's older sister Tatsumaki insults Psykos (as half of Psykorochi) for relying on beings such as Orochi, Psykos flies into a rage that nobody will acknowledge her, even after all the power she's gained now.
  • Kill All Humans: Her goal after seeing something from the future.
  • The Leader: He coordinates the other monsters. Double Subverted in the manga, as at first she seems to be The Dragon and probably The Strategist, but the fact that she made Orochi into the Monster King implies she's still in charge, just not public about it.
  • Meganekko: Her true form is an attractive woman who wears glasses.
  • Mind over Matter: He has telekinesis on a level that can be described as stronger than Fubuki, but weaker than Tatsumaki.
  • Mission Control: Uses his mind powers to talk with the other monsters and coordinate.
  • Ms. Fanservice: Her true body is actually quite attractive in contrast to her monster puppet. The manga also seems fond of putting her in poses that emphasized her figure. Even her One-Winged Angel Fusion Dance with Orochi still manages to be pretty sexy when she's the one with the majority of control.
  • Nightmare Face: The look he develops every time he discusses evolution.
  • Oh, Crap!:
    • When she sends out a drone to find Gouketsu, wondering what's keeping him from arriving back at the Association, only to find his corpse, missing his head and a good chunk of his upper torso (courtesy of Saitama). Considering how powerful he was, she is right to be rather concerned about this development.
    • Get's three consecutive Oh, Crap! when she first meets Tatsumaki in the monster Headquarters. The first because Tatsumaki is much, much stronger than Psykos anticipated, the second because Tatsumaki knows Gyoro Gyoro is just a remotely controlled meat puppet and the third when (the brainwashed by her into absolute obedience) Orochi doesn't heed her call for help, so she (correctly) assumes that Orochi has engaged an enemy so dangerous that he has no opportunity to save her.
    • She gets yet another one when Orochi returns but reveals that he has no intention of obeying her and begins to consume her whole. She manages to fight back, resulting in a Split Personality Fusion Dance.
    • Another one still when when has her first encounter with the being known only as "God".
    • An even worse one when Tatsumaki visits her in prison, looking to settle the score. It's so bad that she faints on the spot.
  • One-Winged Angel: Her fusion with Orochi results in a massive winged moth-like beast with twin blades, with Psykos's upper half emerging out of the head, now much larger than her normal size, although neither villain is completely in control and are still battling for dominance over each other.
  • Playing with Syringes: Although he didn't actually use syringes, she experimented on countless humans to find a way to transform them into monsters.
  • Psychic Powers: Has the standard telekinesis of every psychic in the series, but also displays a fair amount of telepathy as well. And in the webcomic, it’s revealed Psykos was also able to look into the future, and what she saw helped to motivate her Kill All Humans plan.
  • Samus Is a Girl: In reality, she's a human esper remotely controlling a monstrous body. Black Sperm remarks on her human form that he never expected that she was a girl.
  • Sexy Spectacles: Her true human body wears a pair of glasses, and the manga highlights that she's as much a Ms. Fanservice as Blizzard with her form fitting robes.
  • Split Personality: The Fusion Dance between Orochi and Psykos has the personalities of the two battling for dominance while simultaneously trying to defeat Tatsumaki. Orochi has an ulterior motive - he wants to absorb Saitama to complete his revival and become the most powerful being in existence.
  • The Strategist: He plans the matchups by the monsters against heroes during the invasion, allowing monsters to deal with heroes normally above their level.
  • Super Serum: When Tatsumaki finds Psykos' true body and forces her out to a confrontation, Psykos drinks a mysterious liquid that boosts her esper powers when she realizes none of her monsters are responding to her mental calls. This allows her to put up a better fight against Tatsumaki, though it's not long before the S-Class Hero overpowers her.
  • Took a Level in Badass: Psykos was much weaker during her school days, capable of lifting only a person at best while Fubuki could lift a truck. By the present day, Psykos has increased her raw power by so much that she's a Dragon-level threat, and much stronger than Fubuki to boot.
  • Underestimating Badassery: Seriously underestimated Tatsumaki, much to his later horror. Ditto with Fubuki later. In the manga, he also decides to try and accelerate Garou's transformation into a powerful Monster by sending stronger members of the Association against him, but he clearly underestimates his own drive and goals.
  • Unskilled, but Strong: Ends up being so in the webcomic vs. Fubuki, as even though her psychic powers are more powerful, Fubuki is able to defeat her through superior psychic technique. Subverted in the manga, where she displays several unique techniques compared to the other psychics in the series, and even manages to turn Tatsumaki’s power against her after fusing with Orochi.
  • Unwitting Pawn: It's implied that Orochi was merely letting her think she had control over him while allowing her to feed him monsters to power him up. He later confirms that she will be next in line. She does get credit for managing to hold him off for the time being.
    • She also serves as one to God, who makes Psykorochi into its representative and will when Psykos accepts its orders without even thinking, knowing that she will gain new power beyond all that she'd had before.
  • Voice with an Internet Connection: Though not as powerful as Tatsumaki, it is shown that Gyoro Gyoro is powerful enough to send out psychic signal to his colleagues from over great distances, as well as remotely control a "Meat Puppet" from several hundred meters underground.
  • Walking Spoiler: You think?
  • We Can Rule Together: Gives Garou the chance to join her to defeat the heroes. He refuses.
  • We Used to Be Friends: With Fubuki.

    (Unmarked Spoilers) 

Psykorochi

https://static.tvtropes.org/pmwiki/pub/images/psykorochi.png
An entity created when Orochi tries to absorb Psykos, and the latter tries to usurp him from within, which causes the two monsters to become a powerful being with dueling minds that fight for control against each other as it goes against Tatsumaki.
  • Ambiguous Gender: As the two components of the fusion are a man-turned-monster and a human woman, it's hard to say which gender Psykorochi falls under, at least before one of them successfully absorbs the other as the dominant personality.
  • A God Am I: Played with. After Psykos meets with God, she still sees the latter as a superior being, while she (as half of Psykorochi) is enforcing its will as its last representative, however she still refers to herself as a star-like perfect being who may be able to become the Earth itself.
  • The Assimilator: It still secretes Orochi’s flesh to continue absorbing monsters and people for more power. It’s unsuccessful attempt to absorb Saitama (due to slipping off his bald head) gets it punched; distracting it enough that it stops attacking Tatsumaki. This gets taken Up to Eleven when it's revealed that it wants to assimilate all life in existence.
  • Attack of the 50-Foot Whatever: Takes the form of an eldritch moth-like creature that’s several stories big.
  • Battle in the Center of the Mind: One is ongoing between Orochi and Psykos even as they work in tandem to control their new body, with both of them seeking to become the permanent main controller.
  • Bioluminescence Is Cool: Has several glowing tendrils to indicate it’s psychic power thanks to Psykos.
  • Blade Below the Shoulder: It has two very long blades on two of its hands.
  • Body Motifs: Psykorochi is based on neurons, as shown here.
  • Demoted to Dragon: In a very odd way, given that it considers itself to be the will of "God" and its representative in wiping out and assimilating all life, yet "God" itself has never personally appeared to anyone else in the Association other than Homeless Emperor.
  • Devour the Dragon: A weird case in that Psykos and Orochi both clearly consider the other to be the "Dragon" in question. Orochi interrupts the duel between Psykos and Tatsumaki intent on devouring the former to restore his body and power to greater heights, even feigning some level of weakness so that Psykos comes to Orochi first with her intent to usurp his power before surprising her. However, Psykos' will proves too strong for him to subsume completely. The resulting monstrosity has the two of them still fighting for dominance even as they focus on destroying their enemies.
  • Fusion Dance: Because neither side is willing to just be absorbed by the other, it instead becomes this, and it's very volatile.
  • Gaia's Vengeance: Claims that its mission is to assimilate all life as the will of God and fate, and wonders if it can become the planet itself in order to accomplish this.
  • Genius Loci: Not yet, but Psykorochi is definitely pondering whether it has to power to become the Earth itself before going beyond even that.
  • Mouth of Sauron: Psykorochi states that it serves as the representative and will of a higher power believed by Psykos to be "God".
  • Multi-Armed and Dangerous: Has four arms, with each pair holding a massive spear-like weapon.
  • One-Winged Angel: Their fusion results in a massive winged moth-like beast with twin blades, with Psykos's upper half emerging out of the head, now much larger than her normal size, although neither villain is completely in control and are still battling for dominance over each other.
  • Psychic Powers: Psykos' already-considerable esper abilities (though it's nowhere near enough to match Tatsumaki's) are enhanced thanks to the fusion, to the point she can actually overpower and subvert Tatsumaki's own powers (although Tatsumaki is still somewhat holding back due to not wanting Taro to get caught up in her attacks) when previously no other opponent had ever come close.
  • Split Personality: The Fusion Dance between Orochi and Psykos has the personalities of the two battling for dominance while simultaneously trying to defeat Tatsumaki. Orochi has an ulterior motive - he wants to absorb Saitama to complete his revival and become the most powerful being in existence.
  • Took a Level in Badass: As a Fusion Dance, Psykos was able to amplify her psychic power with Orochi as the power source so that it can match Tatsumaki's, and this likely applies to Orochi too due to God's interference during its formation.
  • Unwitting Pawn: Implied by Tatsumaki that, due to Psykos not thinking any of it through and remembering that espers have always been used and abused by others, the creature known as "God", who makes Psykorochi into its representative and will when Psykos accepts its orders, is using Psykorochi as a mere pawn.
  • Wave-Motion Gun: Fires one at Tatsumaki that's so huge and powerful it splits part of the planet's crust off in a shot that can be seen from space before it crashes back into Earth and unleashes a tsunami.

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Executives

    In General 
https://static.tvtropes.org/pmwiki/pub/images/monster_association_executives.jpg
Dragon-level monsters and the elites of the Monster Association. Each one of them is extremely powerful, more than enough to overwhelm a S-Class hero in single combat.
  • Difficulty Spike: After the Hero Association invades the MA's headquarters and steamrolls over the weaker monsters, they run into these guys and very nearly lose.
  • Person of Mass Destruction: As a threats capable of harming entire cities, this is a given.
  • Sorting Algorithm of Evil: They show up once all the Demon-level monsters are killed off, and are far more powerful.
  • Wolfpack Boss: The remaining ones team up against Tatsumaki, who is powerful enough to handle all of them on her own. They still beat her though, because one of them knows exactly how to fight psychics.

    Black Sperm 

Black Sperm

Voiced by: Yuichiro Umehara (Japanese), Jalen K. Cassell (English)

Debut: Chapter 58 (Webcomic), Chapter 79 (Manga)

Disaster Level: Dragon

https://static.tvtropes.org/pmwiki/pub/images/black_sperm_5.PNG
One of the Association's most powerful members, a gestalt entity composed of sentient cells who can split and recombine as needed. Look down on him at your own peril.
  • The Assimilator: Golden Sperm, a permanent fusion of 10 trillion cells with one consciousness, demanded the remaining 100 Black Sperm cells be absorbed as well since they no longer had a reason to exist with him around.
  • Asteroids Monster: In his form as an undifferentiated mass, cutting him to pieces just creates more bodies for him. This is a real problem for Atomic Samurai, whose only tactic is cutting things to pieces. Even when Atomic Samurai catches Black Sperm off-guard by revealing he's developed a concentrated slash attack that wipes the target out down to the cellular level and destroys multiple bodies with it, Black Sperm simply hides and waits for Atomic Samurai to think he's wiped out all his bodies before launching a surprise attack.
  • Berserk Button: He seems to really hate being underestimated.
  • Beware the Silly Ones: He looks like a guy wearing a latex suit with an antenna, yet he is very much a legitimate threat. He beats down on Atomic Samurai without remorse in his normal form even when Atomic Samurai reveals he can permanently end him. As Golden Sperm, he briefly managed to hold his own against Evolved Garou and is in fact considered the second strongest member of the Monster Association after Orochi himself. Murata has stated that, in terms of raw power, he actually isn't sure which one of the two is stronger, although Orochi is a more skilled fighter.
  • Big Bad Wannabe: He was a threat to the other S-Class Heroes with the exception of Tatsumaki. The esper was easily beating him up until he created Golden Sperm. However even then he was easily defeated by Awakened Garou and ONE stated that Tatsumaki would have defeated him if she wasn't injured.
  • Black Eyes of Crazy: Black eyes and certainly off his rocker.
  • Catch Phrase: "Are you looking down on me?"
  • Clipped-Wing Angel: Multi-Cell Sperm. He can't stand up to Tornado at all despite being comprised of over one trillion cells, and his death reveals a crucial shortcoming in the cells' Fusion Dance: that they lose their ability to split apart.
  • Entertainingly Wrong: Because he witnessed Saitama spare Garou's life even against the wishes of the other heroes, he makes the understandable conclusion that Saitama must have a vow not to kill. Accordingly, he decides it's a good idea to stick with Saitama and follows him home. What he doesn't know is that Saitama only spared Garou because he realized he was actually still human, and he has and will very quickly kill any actual monsters he comes across. Luckily for Black Sperm though, Saitama is so dense that he fails to realize he's a monster anyway.
  • Flash Step: Moves very quickly.
  • Fusion Dance: Apparently comes in two varieties. One is for multiple cells to merely form the same body while retaining their individuality and the other is for the cells to merge permanently, forcing all but one to basically disappear into nothingness.
  • Golden Super Mode: Golden Sperm mode. Requires at least ten trillion cells to create. This form vastly increases its powers and is able to defeat an injured Tatsumaki and was able to temporarily fight with evolved Garou.
  • Hive Mind: A monster with well over eleven trillion bodies to spare. Fortunately, those bodies are nearly microscopic.
  • Hypocritical Humour: Somewhat subtle version as it's drawn out over time after his initial anger over being looked down on and Black Sperm having a rather serious (and terrifying) demeanor while doing it. Black Sperm proclaims that he despises being looked down on, yet afterwards he does this to his opponents constantly both with his mocking insults, smug facial expressions, and his poses, where several of his copies will be lying down resting or apparently dancing in the middle of the fight.
  • Lightning Bruiser: He's faster than Genos can keep up with, powerful enough to heavily injure Atomic Samurai with just one punch, and near immortal with 11 trillion back up bodies to make up for us lack of durability.
    • Golden Sperm takes this Up to Eleven compared to regular Black Sperm. Sweet Mask notes that Golden Sperm could take on and beat all the S-Class heroes sans Tatsumaki by himself just because he's so fast they can't even see him move.
  • Me's a Crowd: Splits into other cells.
  • No-Sell: Against an injured Tatsumaki as Golden Sperm, who tries to use her powers to snap his neck. He just holds his head in its default position.
  • Not-So-Harmless Villain: He might look like a rejected teletubby, but he is one of the Association's strongest members.
  • One-Winged Angel: The Golden Sperm mode. He becomes powerful enough to no-sell Tatsumaki's attack and trashes her with no effort.
  • Power at a Price: Merged cells like Muti-Cell Sperm and Golden Sperm are a lot more powerful but they lose their ability to split, meaning that unlike the regular cluster cells they can be killed by being torn apart.
  • Sleep-Mode Size: After his Golden Sperm mode and the fusion of one hundred cells was defeated by the awakened Garou, he was left with what seems to be just one copy of himself remaining and is as large as rover, to the point where he can be mistaken for an animal.
  • The Worf Effect: His One-Winged Angel form was completely trashed by Garou. And before he defeated Tatsumaki (though Word of God said she would've won at full power).
  • Would Hurt a Child: He appears to care little for the lives of humans as he was about to kill the child kidnapped by the Monster Association without remorse. In fact, he actually calls to the child so he can kill him, with the same casual manner of a man asking for directions.
  • Zerg Rush: He can throw many cells at someone as a distraction.

    Overgrown Rover 

Overgrown Rover

Debut: Chapter 58 (Webcomic), Chapter 89 (Manga)

Disaster Level: Dragon

https://static.tvtropes.org/pmwiki/pub/images/overgrownrover.png
The guard dog of the Monster Association, and easily one of their most powerful members.
  • Angry Guard Dog: Rover's role is to roam the corridors of the Monster Association's HQ and deal with any threat. Despite this very basic role, it is considered to be a cadre within the association for its sheer strength.
  • Breath Weapon: Attacks by firing many destructive blasts from his mouth.
    • The blasts are so devastating that they destroyed a large portion of the Monster Association's base and even caused shockwaves and tremors in the city above it.
  • Brought Down to Normal: After the collapse of the Monsters Association with the underground base literally falling atop of him. Rover has shrunk down considerably to a more manageable size.
  • Cool Pet: After the battle, it becomes one to Saitama.
  • Fluffy the Terrible: After shrinking down, he looks almost adorable enough to eat. One would never suspect him of once being a titanic super beast capable of leveling city blocks. Saitama even considers keeping him as a pet at his new pad in Hero HQ.
  • Non-Malicious Monster: His behavior suggests that he's not really evil, just trained to be aggressive to all intruders. Once the Monster Association is gone and Rover shrunk down, he acts just like any other friendly dog.
    • He lets Garou and Tareo go after they slowly backed away, only attacking when Garou accidentally hit him with a deflected monster blow.
  • Screw This, I'm Out of Here!: After waking up from Saitama's punch, he takes one look at the hero confronting Orochi, turns tail, and runs.
  • Sleep-Mode Size: After taking much damage he was shrunk down to a normal, albeit still monstrous looking, size.
  • Super Toughness: And how! Was unfazed from unawakened Garou's best attack. He even resisted Saitama's legendary Death Blow (although it was because Saitama was treating him as merely a huge dog and wasn't trying to kill him) and remained strong enough to take on three individuals equal to S-Class in strength with ease.
    • For context, fellow Dragon-level member Centichoro was hit by Bang and Bomb's Roaring Aura Sky Ripping Fist, which shattered its famously durable carapace. Overgrown Rover was hit by their Cross Dragon Slayer Fist, which is said to be even more powerful, but all it did was just annoy the dog.
  • Weaksauce Weakness: As crazy powerful as he is, he's still a dog. Just telling him to sit is enough to calm him down and let you pass through.

    Homeless Emperor 

Homeless Emperor

Debut: Chapter 58 (Webcomic), Chapter 89 (Manga)

https://static.tvtropes.org/pmwiki/pub/images/homeless_emperor_8.png
A misanthropic and genocidal man who has seen the truth of humans and God, and has the power to create destructive orbs of light.
  • Badass Armfold: He is introduced in the manga with this pose, gathering with other Dragon-level monsters and completely confidant in his ability to fight the S-Class Heroes.
  • Badass Boast: "I alone am more than enough to defeat all heroes."
  • Badass Cape: Downplayed. He has a cape but it looks like a big rag he's tied around his neck.
  • Beard of Evil: To give off the hobo theme, and he's a monster (mentally).
  • Combat Pragmatist: Sneaks up on Zombieman to attack him from behind.
  • Cool Crown: Homeless Emperor sports a small plain crown on his head.
  • Dark Messiah: Homeless Emperor has a messiah complex, believing it is his duty to exterminate humanity in order to save the planet and bring balance to nature.
  • Freudian Excuse: He was humiliated when he first started working, by being forced to dance naked in front of the staff and was fired shortly after for sexual harrassement at that, which made him conclude all humans are evil and should die.
  • Glass Cannon: Even though he's decently fast and possesses a hugely destructive power, Homeless Emperor is not suited for close quarters combat since his body is that of a regular person. He also isn't immune to his own energy spheres.
  • Kill All Humans: His main goal because he believes that all Humans Are Bastards.
  • Light 'em Up: He is able to summon energy spheres which are similar to miniature suns capable of great destruction. These spheres explode upon contact. He is also shown to be able to use the energy and blast it from his fingertips.
  • Looks Like Jesus: Has shaggy long hair and unkempt beard that's reminiscent to the typical portrayal of Jesus. Quite a fitting appearance for a Dark Messiah who claims to be on a Mission from God.
  • Misanthrope Supreme: Hates humanity with a passion and wants them all to die. Despite being a human.
  • Required Secondary Powers: Subverted, he is not immune to his own energy spheres which is why he can't blast away Zombieman (who managed to put him in a chokehold) without hurting himself.
  • Shoot the Bullet: He's able to move his destructive spheres around to destroy the bullets shot at him during his fight with Zombieman.
  • The Hermit: Temporarily one until he got his powers.
  • Token Minority: He's not actually a monster, but rather a human with the mentality of one who was later blessed with supernatural powers.
  • Touched by Vorlons: He acquired his light powers by meeting with a mysterious being who he believes to be "God" and who seemingly gave him the mission to eradicate humanity.
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    Fuhrer Ugly 

Fuhrer Ugly

Debut: Chapter 58 (Webcomic), Chapter 89 (Manga)

Disaster Level: Dragon

https://static.tvtropes.org/pmwiki/pub/images/fuhrer_ugly_1.png
A man transformed into a monster by his ugliness and hatred for the good looking and popular. He is classified as an Ugmon, defined by his ugliness.
  • Acrofatic: He's got quite a gut but he's still able to move faster than the human eye can see and perform perfect splits when kicking.
  • Bald of Evil: Got no hair on his head and is quite evil.
  • Evil Makes You Ugly: Fuhrer Ugly is filled with jealousy and self-hatred so much to the point where it turned him into a monster. His inferiority complex and ugliness makes him particularly hate good-looking opponents like Sweet Mask.
  • Freudian Excuse: He's ugly and envious of good looking people, which made him evil.
  • Gonk: Being an Ugmon, Fuhrer Ugly is an incredibly ugly man that became a monster.
  • Healing Factor: He has a limited amount of regeneration as he was able to quickly regenerate from Bang's barrage of attacks and Genos' kick.
  • One-Winged Angel: Can manipulate his cells to change into a more hideous and bigger form.
  • Super Toughness: He was able to brush off Genos' kick without much problem and tank several hits from Bang before the latter got serious.
  • The Power of Hate: Being an Ugmon, this is what gives him great power.
  • Super Speed: Fuhrer Ugly's speed is so fast that it even surprised Sweet Mask.
  • Super Strength: He is able to lift boulders. In addition, he dealt a lot of damage against Tatsumaki.
  • Underestimating Badassery: To Bang. It gets him dead.

    Gums 

Gums

Debut: Chapter 58 (Webcomic), Chapter 89 (Manga)

Disaster Level: Dragon

https://static.tvtropes.org/pmwiki/pub/images/gums_4.png

A monster with a big mouth and an even bigger appetite for heroes.


    Evil Natural Water 

Evil Natural Water

Debut: Chapter 58 (Webcomic), Chapter 89 (Manga)

Disaster Level: Dragon

https://static.tvtropes.org/pmwiki/pub/images/evil_natural_water.png
A non-sentient monster that attacks all those hostile around it with piercing water jets.
  • Attack of the 50-Foot Whatever: He is a huge mass of water with a pair of eyes floating inside.
  • Blob Monster: Looks like this, with Child Emperor commenting how he looks like an RPG grunt.
  • Devour the Dragon: When its body becomes frozen by Child Emperor, it sucks the oil out of Sludge Jellyfish in order to decrease its own freezing point and render it immune to further freezing attacks.
  • Empath: Evil Natural Water is not, actually, all that evil. It only becomes aggressive when exposed to feelings of hostility around it; otherwise, it's just a harmless blob of water. Though interestingly, it seems to ignore the Mad Doctor Fish that lives inside it, but will attack those whose hostility is triggered when battling the fish.
  • It Can Think: Downplayed, as Evil Natural Water has no brain and acts mainly on instinct. However, that instinct also belies a hidden intuition and it will use a new strategy to counter the opposition as necessary. When Child Emperor takes advantage of the fact it's just a mass of water and starts freezing it, Evil Natural Water recognizes this and assimilates oil into its body to drastically lower its freezing point and render such a method useless.
  • Just Eat Him: Eaten by Pig God who came back to make sure there are no enemies remaining.
  • Making a Splash: He is capable of firing of firing devastating high-speed jets of water in an instant. The jets of water are about as fast as bullets, fast enough to be almost impossible to track and predict, and have a higher penetrating power.
  • Murder Water: It's a blob of water that kills whenever it senses Killing Intent around itself. Granted, otherwise it just sits around.
  • Nigh-Invulnerability: His body is made up of water and therefore cannot be harmed by normal means. It however can be scattered to many droplets, if the force used against it is powerful enough.
  • Not-So-Harmless Villain: He might look like a Mook, but he's actually quite powerful and nearly impossible to kill through pure physical force.
  • Offhand Backhand: Saitama pretty much evaporates it with a single punch. He gets better, though...
  • Piranha Problem: It has a symbiotic relationship with the Tiger-level Mad Doctor Fish, which are a bunch of bloodthirsty piranha that swim inside its body and devour anything it catches to provide extra protection.
  • The Voiceless: Never speaks a word onscreen, makes sense because he’s just a water monster.

    Nyan 

Nyan

Voiced by: Uncredited (Japanese), Christian la Monte (English)

Debut: Chapter 66 (Manga)

Disaster Level: Dragon

https://static.tvtropes.org/pmwiki/pub/images/nyan.jpg
A humanoid cat monster, introduced looking for Puri Puri Prisoner and recruiting the other inmates into the Monster Association.
  • Anthropomorphic Transformation: He transfromed from an ordinary housecat into a bipedal, humanoid cat monster with intelligence.
  • Benevolent Boss: He takes direct control of the monsterized criminals, and agrees to their request to allow them to fight Puri Puri Prisoner first to exact revenge.
  • Cat Folk: He's a humanoid cat person with big eyes, and a bell collar.
  • Combat Pragmatist: He tends to sneak up on his targets and strike them with his claws from behind, and makes liberal use of his superhuman speed to surprise his enemies and slice them mercilessly.
  • Dirty Coward: He's quick to run away from anyone that might give him even a little bit of trouble, and will fight only if he has an overwhelming advantage or he can't escape from his opponent.
  • Fate Worse than Death: Nyan may not be dead but considering what's in store for him, he's gonna wish he was.
  • Fragile Speedster: He doesn't display the same raw destructive power and durability the other executive members do, but he's incredibly hard to hit thanks to his Super Speed and Rubber Man abilities. Once Drive Knight lures him into a trap, the fight is over in an instant.
  • Freudian Excuse: Parodied. The reason why Nyan, one of the Monster Association's strongest members, became a Mysterious Being is that apparently he felt so annoyed by his previous owner's excessive affection towards him that he transformed into an incredibly strong monster; notably, this dislike of clingy people is the reason why he chose to not fight Puri-Puri Prisoner.
  • Hoist by His Own Petard: Nyan decides to slip into Drive Knight's armour to shred him apart from the inside, but Drive Knight purposefully lets him enter his armour while he's in Gold Mode, which happens to produce a lot of heat. Nyan is burned and in his weakened state, is finished off by Drive Knight.
  • Hulking Out: When Nyan is prevented from escaping and becomes really angry from Drive Knight's attacks, the monster gets serious and changes into an empowered form with a much more muscular body, more pronounced spiked fur on his shoulders, as well as growing very long claws.
  • More Teeth than the Osmond Family: When he has the upper hand in his fight with the surface team, he sports a huge grin that shows all his razor sharp teeth.
  • No-Sell: During his fight with the backup team on Z-City, C-Class Hero Poison tries to stab him in the eye with his knife once A-Class Hero Green has him restrained with his vines. Nyan's response? Catch the knife with his EYELID, which he then procedes to break.
  • Not-So-Harmless Villain: Despite looking like a humanoid house cat, he's frequently seen along side the rest of the Dragon-level monsters whenever they're mentioned or shown together. He proves why he's Dragon-level when he runs into a group of lower-ranked Heroes on the surface and completely curbstomps them.
  • Paper People: One of the applications of his Rubber Man ability is to turn himself flat like a paper to avoid attacks.
  • Razor Wind: When he's serious enough, his long claws are capable of generating claw-like blades of wind capable of shredding an entire street with each swing.
  • Rubber Man: Well, Rubber Cat-Man. Just like ordinary cats can seem to slip through the tiniest openings, Nyan has the ability to slip through any crack larger than 3 millimeters to travel around, and is capable of turning flat to avoid attacks. In fact he can even infiltrate intricate electronic devices.
  • Sadist: His desire to play with prey before killing it back when he was still an ordinary cat carried over after his transformation. This is demonstrated to great effect when he runs into a group of lower-ranked Heroes who stand no chance against him.
  • Screw This, I'm Out of Here!: Tends to run away when his surprise attacks fail to put down his enemy with the first blow. When facing Puri Puri Prisoner he's merely unsettled by the Hero's "loving nature" (see Freudian Excuse above) and disturbed to the point of running away. When he attacks Saitama, he's completely freaked out by his inability to inflict damage on him (And probably for the fact he just nonchalantly defeated Rover, which is by no means easy), prompting Nyan to run away.
  • Slasher Smile: Sports a massive one with More Teeth than the Osmond Family when declaring his intention to kill Waganma in front of the heroes on the surface.
  • Stealth Expert: His ability to squeeze through any crack lets him spy and get the drop on others very effectively.
  • Super Speed: Fast enough to perform a Flash Step followed by You Are Already Dead.
  • The Worf Effect: He proves why he's an executive when he runs into the surface team of heroes and tears them apart without even trying. And then he receives a Curb-Stomp Battle from Drive Knight, who didn't get a chance to fight anyone tougher than a Mook and show off his true abilities.

    Gouketsu 

Gouketsu

Voiced by: Kenji Nomura (Japanese), Kellen Goff (English)

Debut: Chapter 66 (Manga)

Disaster Level: Dragon

https://static.tvtropes.org/pmwiki/pub/images/gouketsu.jpg
A giant dragon-level monster who was previously the winner of the first martial arts tournament. After being defeated by Orochi he ate a monster cell and became a monster.

  • Always Someone Better: Had this done to him in the past by the Monster King and deals it to Suiryu in the present. On a personal level, he's fully aware of this trope in general and advises Bakuzan not to get too caught up in his newfound power, pointing out that he himself is still much stronger than the newly transformed Bakuzan with the Monster King Orochi being even stronger still. Then he runs into Saitama, who of course is the "someone better" to everyone else on the planet.
  • Ambition Is Evil: His ambition prompts him to consume a monster cell and gain even more power.
  • Anime Hair: Good lord, it's probably the craziest in the entire series. It looks like a sea urchin, even when he was a human!
  • Anti-Climax Boss: Gouketsu gets a lot of build-up in the tournament arc. He beats Genos, martial arts champion Suiryu and a monsterized Bakuzan without even trying. Genos, one of the few people who knows Saitama's real strength, says he sensed an unfathomable amount of power from Gouketsu in their short fight, similar to Saitama, and believes only a quick ambush by Saitama and the S-Class heroes could safely defeat him. When Saitama goes to face him alone, Suiryu begs him not to go, and when Saitama leaves, Suriyu curses himself for not being able to stop his savior from meeting certain death. And then Saitama casually obliterates Gouketsu (off-screen no less), just like nearly every opponent he faces. When asked if he was strong, Saitama says he couldn't tell, because Gouketsu didn't last long enough to make an impression.
  • Arrogant Kung-Fu Guy: He's quite arrogant and became even more arrogant after eating the "monster cells" and turning into a monster. That said he's also rather grounded since he outright admits that the Monster King is still stronger than him and that he wouldn't stand a chance against the combined might of the Hero Association on his own.
  • Art Evolution: Gouketsu was originally designed without the black marking on his forehead and chin. His teeth were larger and sharper, while the redrawn version looks more human.
  • Benevolent Boss: Surprisingly enough, he can be this if you manage to impress him. When Bakuzan becomes a monster and attacks him, Gouketsu goes out of his way to subdue him harmlessly, then explain how to navigate his new life as a monster and how the Monster Association works. It comes off as a veteran worker showing the new guy how things go in the workplace.
  • Curb-Stomp Battle: Defeats Sneck and Lightning Max with one kick. Also defeats Genos in a battle so one sided, it's not even shown. Suiryu gets beaten badly with two restrained punches and a bunch of flicks from one finger. Monster Bakuzan doesn't fare any better despite being a fellow Dragon-level monster; he gets sent flying just by having a punch blocked and wisely surrenders after Gouketsu demonstrates his true strength by destroying the stadium with the sheer force of a punch a la Saitama. And then he meets Saitama off-screen, who promptly sends his head flying.
  • Curb Stomp Cushion: Implied. When Saitama takes him on in an off-screen big moment, he still goes down in one hit, but Saitama returns with some noticeable scratches on both his clothes and person, which for him is pretty much proof that Gouketsu managed to do a little damage and automatically makes him one of the strongest foes Saitama's fought.
  • Does Not Know His Own Strength: When he sent Lightning Max and Sneck flying, he said he just "tapped" them.
  • Dope Slap: Gives one to Suiryu after he rejects his offer. It hurts a lot more than it looks.
  • Dropped a Bridge on Him: He seems a sort of future Arc Villain. Instead he is quickly killed by Saitama... off-screen!
  • Expy: Of Akuma/Gouki from Street Fighter. He's a martial artist who embraced a darker route to achieve power, who corrupts other fighters into becoming powerful monsters, just like what Akuma tries to do with Ryo. He also physically resembles Akuma, from his hair to the clothes he's wearing.
  • Extra Eyes: He has four eyes. He grew the extra pair after becoming a monster.
  • Finger Poke of Doom: Catches Suiryu's full strength attack by pinching it and delivers a No-Holds-Barred Beatdown on him by flicking him with his middle finger.
  • Knight of Cerebus: The tournament arc was fairly fun and lighthearted. Once it's over, Gouketsu barges in and the tone of the manga takes a sudden and dark turn, complete with the most brutal beatdowns seen yet.
  • Lightning Bruiser: Despite his oversized body, he can move pretty fast as he delivered a quick kick to Lightning Max and Sneck and sent them flying. He also defeats Genos before the latter even knew what hit him. He even manages to do a little damage to Saitama given the scratches on his clothes and person after the fact...not that it meant much in the end.
  • No-Sell: He lets Suiryu's attacks bounce off before slapping him down to let him know just how outmatched he is.
  • Off with His Head!: When he is killed by Saitama off-screen, his head gets ripped off by Saitama's punch and flies right into the stadium, falling in front of a weakened Suiryu.
  • Sadistic Choice: Gives this to the martial art contestants. Either eat the "monster cells" to become a monster and join the Monster Association or be killed by him.
  • Spikes of Villainy: His arms and shoulders are covered with spikes, and that's before one takes into account his crazy hair.
  • We Can Rule Together: Offers Suiryu a second chance to become a monster and a high ranked officer in the Monster Association despite his earlier defiance because of his great strength, by appealing to his desire for an easy life.

    Centichoro 

Centichoro

Voiced by: Naoki Bando (Japanese), Richard Epcar(English)

Debut: Chapter 55 (Manga)

Disaster Level: Dragon

https://static.tvtropes.org/pmwiki/pub/images/elds.png
A truly gargantuan dragon-level centipede monster that few heroes can actually defeat.
  • Attack of the 50-Foot Whatever: Large enough to coil around several skyscrapers with ease, and is called "the incarnation of a natural disaster" by Phoenix Man. It's noted by the Association he's actually grown since the last time he was spotted.
  • Always a Bigger Fish: He appeared after Centisempai's death who appeared after Centikohai's death.
    • Also he's the first Dragon-level monster who debuted in this arc, and the first one who is explicitly said to be this level in the manga (the ones before were revealed through Word of God). According to Phoenix, the only members of the Association who could hope to kill him are Tatsumaki, Metal Knight using his secret stash of weaponry, King, or Blast, the man who nearly killed him the first time.
  • Berserk Button: Blast is his, since the Number 1 S-Class Hero almost killed him in the past.
  • Big Creepy-Crawlies: He's a Kaiju-sized centipede with an old man face.
  • Body Horror: He appears to have 1 insectoid face with 4 eyes and 3 humanoid faces nested in each other's mouths. After molting, he grows yet another face within a mouth and 2 extra eyes.
  • Combat Pragmatist: Despite his Super Toughness, Centichoro noticeably takes steps to make sure opponents can't hit his (comparatively) fragile face, shifting his body and mandibles as shields as necessary when he could likely just power through them anyways and trust his regeneration to do the rest. It's implied this has to do with nearly being killed by Blast in the past, thus being a lesson of humility.
  • Creepy Centipedes: The biggest and baddest of them all, being a Dragon-level Kaiju with creepy old man faces.
  • Good Thing You Can Heal: Even in the event something manages to hurt him, he can just molt his carapace to repair the damage. He's even able to regenerate from Genos frying his insides with a powerful blast. The only way to finish him is to hit him with enough force to kill him in one shot, and even that took Saitama using a Serious Series Serious Punch (although it was to prevent EC's huge body rolling into the city and wrecking it.)
  • Nested Mouths: Taken Up to Eleven with nested heads within each mouth.
  • No-Sell: Metal Knight's attacks didn't even scratch him, and Metal Bat's own strikes (which just previously had torn through Centisempai's carapace) to his face just annoy him.
  • Power Pincers: He tore Genos in half with his oversized mandibles.
  • Purple Is Powerful: His carapace in the anime is a dark purple, and he's the most powerful of the centipede monsters.
  • Sand Worm: He basically swims through the ground, only surfacing when he is needed.
  • Super Toughness: His shell has so far proven to be completely impenetrable to everything that's been thrown at it with neither Metal Bat's swings or Metal Knight's missiles doing any damage whatsoever. His face is the only comparatively vulnerable point and even then he seemed more annoyed than anything else after Metal Bat strikes it several times. Even after Bang and Bomb destroyed his carapace with a combined attack, he simply molted into a more powerful form.
  • Too Long; Didn't Dub: His official dub name Centichoro is the prefix centi- slapped onto the Japanese word for elder. Chances are, most readers won't understand what choro means or that his name is supposed to go with the age theming with the younger centipede monsters.
  • Villain: Exit, Stage Left: After Phoenix Man failed to persuade Garou, Centichoro grabbed him and Rhino Wrestler and ran away.

Other Dragon-Level Members

    Phoenix Man 

Phoenix Man/Phoenix Man Reincarnated

Voiced by: Hiroki Maeda (Japanese), Jonah Scott (English)

Debut: Chapter 60 (Webcomic), Chapter 58 (Manga)

Disaster Level: Dragon (Formerly Demon)

https://static.tvtropes.org/pmwiki/pub/images/phoenixman.png
Phoenix Man.

Click here  to see Phoenix Man Reincarnated.

A man who once starred in the dark comedy "Animal Empire" as Birdman, an idiotic phoenix who constantly died from his own stupidity but would return in the next episode just fine, before the show was canceled and he himself fired by his cruel and unsympathetic producer. Unable to let go, he continued to wear the costume until he lost his humanity and fused with it, becoming a human-sized bird. As arrogant and ambitious as he is intelligent, Phoenix Man dreams of one day obtaining the power to become the strongest Monster of all.


  • Adaptational Badass: He was just a one-off joke in the webcomic, appearing for two panels before being eviscerated by Child Emperor and never seen again. In the manga, not only does he actually have the power to revive like a phoenix, but he is strong enough to give Child Emperor a mind-bending physical and psychological struggle over the course of several chapters.
  • Adaptational Expansion: Receives more characterization and plays a much more substantial role in the manga.
  • Adaptational Personality Change: Is far more rational and pragmatic in the manga than the delusional and arrogant webcomic version, understanding that there are many heroes and monsters much stronger than him. That said, after learning that Orochi Was Once a Man, he seeks to reach even greater power someday.
  • Adaptive Armor: After he reincarnated his costume can transform into various modes with each giving him a different ability.
  • Beak Attack: As a bird-creature, he can obviously do this, but Child Emperor throws up a barrier that he smashes in failure against before he gets finished off. When he returns as Phoenix Man Reincarnated, however, he can now perform the move with even greater strength along with combining it with fire, which lets him punch through five such barriers at once without pause.
  • Blow You Away: He created a gust of wind strong enough to blow Bang, Bomb, Garou, and Genos away.
  • Bird People: Was previously a man with a phoenix costume, now is fused with it.
  • Bishōnen Line: After coming back to life, he goes from looking like a giant bird to an athletic Winged Humanoid with the costume looking more like some sort of armor.
  • Came Back Strong: After dying to Child Emperor, Phoenix Man came back to life as Phoenix Man Reincarnated and got a massive power boost in the process (going from Demon-level to Dragon-level monster), allowing him to go toe-to-toe with Child Emperor's greatest weapons.
  • The Chew Toy: He was this in a children's TV show, being a character called Birdbrain who'd be made fun of because he died numerous comical deaths.
  • Clothes Make the Superman: He originally became a monster when his costume stuck onto him, giving him the resurrection abilities Birdbrain possessed. As he keeps resurrecting and getting stronger, the costume starts giving him more and more phoenix-themed abilities. Deconstructed, however. Child Emperor figures out the key to defeating Phoenix Man is using his costume against him, slipping a tickling robot inside that would forcibly tickle him until he died. In the original Chapter 100, Phoenix Man ends up tearing his costume open to get rid of it and loses his powers, leaving him open for a quick and brutal kill. In the redraw, he refuses to take off the costume and thus laughs and cries to death until he... Well, turns into a baby chick.
  • Curb-Stomp Battle: Easily killed by Child Emperor as Phoenix Man. The rematch, however, proves a different story, with Child Emperor noting that Phoenix Man Reincarnated would have likely overpowered him if he didn't get lucky.
  • Eyes Do Not Belong There: His Reincarnated form has ordinary eyes, but also three working eyes on his bird costume's head and on his chest.
  • Fatal Flaw: Pride and wrath. Sick of always being the chew toy, he worked his way up to being one of the strongest monsters. Upon getting to that level, he constantly brags and taunts Child Emperor instead of finishing him off and then charges in for a final melee attack when he's mocked in return. This allows Child Emperor to hit him with a tickle bot that makes opponents laugh themselves to death, and since he refuses to take his costume off, he approaches death and is reincarnated as a baby bird.
  • Flight: He's a bird, so he can fly.
  • Freudian Excuse: He got fired from his costume actor job and refused to take off his costume, which stuck onto him and turned him into a monster.
  • From Nobody to Nightmare: He used to be just an actor of a child show, but after getting fired and not taking off his costume he became a Demon-level monster. After his resurrection he became an extremely powerful Dragon-level threat - however, he is rendered into a harmless chick-like state at the end of his fight with Child Emperor.
  • Groin Attack: In the original version of Chapter 100, he suffers the worst one in the series yet when Child Emperor kicks him down there while wearing an active chainsaw on his foot.
  • Hoist by His Own Petard: Phoenix Man refuses to take off his costume to escape Child Emperor's tickle bot, resulting in his own defeat. In the original, he ends up tearing his costume open to escape the tickle bot and thus loses his powers to make him helpless against the vengeful Child Emperor's finishing blow.
  • Instant Armor: The new humanoid body he gains after coming back from the dead, also came with an impressive armored suit to signify his increase in power.
  • Just a Kid: What he thought of Child Emperor, thinking he got into the Hero Association purely for fame and thinking he was a match for him. Apparently it never crossed his mind that the kid was an S-Rank hero for a reason. Phoenix Man was shredded up by Child Emperor's many blades for his trouble. He later uses this information against him, however, by manipulating his feelings about being a child among incompetent adults.
  • Killed Off for Real: In the original Chapter 100, Child Emperor killed him by stabbing him through the chest. However, the redrawn Chapter 100 has him escape the encounter in the form of a tiny, harmless chick.
  • Light Is Not Good: His suit can create a light which resurrects nearby monster corpses into a zombie army. However, the fresher the corpses are, the more of their original functions they retain, as seen with the two ninjas.
  • Meaningful Name: The Phoenix is a mythical bird most commonly associated with fire and Resurrective Immortality. Guess what Phoenix Man is able to do after dying?
  • Oh, Crap!: In the original Chapter 100, he has one when he realizes in his haste to tear off his costume and remove Child Emperor's tickling machine, he also just removed the source of his powers.
  • Pet the Dog:
    • At multiple points he expresses some level of concern for his monster comrades and admits he prefers to settle things in a civilized manner rather than go straight for savagery.
    • He seems to have a bit of a soft spot for children due to his time on "Animal Empire", offering to grant Child Emperor a painless death when encountering him and intending to follow through on that even after Child Emperor kills him the first time. It's certainly more noble than with most monsters attempting to torture their opponents before killing them. When Child Emperor summons Brave Giant, Phoenix Man recognizes his fellow costume-user and actually reaches out to him in a costume-based mindscape. Of course, even that has its limit, as he notes after Child Emperor fails to kill him yet again that he's going to eat his brains.
  • Playing with Fire: As Phoenix Man Reincarnated, he can now unleash heat waves and actual flames for attacks.
  • Small Name, Big Ego: Originally claims to be of a higher disaster level than Demon, but Child Emperor proves otherwise. That is, until he came back to life as Phoenix Man Reincarnated, a Dragon-level threat.
  • Stance System: Phoenix Man Reincarnated fights by shifting between several modes, each with its own unique abilities.
    • Phoenix Fire Falcon Mode gives him enhanced speed, flaming claws, and a Feather Flechette Storm.
    • Phoenix Prominence Hawk Mode gives him Super Strength and Energy Absorption, but there is a limit to how much he can absorb at a time.
    • Phoenix Penguin Mode is a Lethal Joke Form that gives him the ability to control ice and slide on his belly.
    • Although it is non-canon thanks to the Chapter 100 redraw, his second resurrection gave him Phoenix Brilliant Eagle Mode, which allowed him to repair and reanimate nearby corpses as his soldiers.
  • The Starscream: Despite being merely being placed middle in terms of power ranking, Phoenix Man has an ambition to overthrow King Orochi.
  • Talking Is a Free Action: Monologued to Child Emperor about the hero's youth, and how he'd one day surpass Orochi. It gave Child Emperor enough time to set up a defense that stopped him cold.
  • They Killed Kenny Again: The character his costume is based on, Birdbrain, dies every episode in some hilariously stupid way but always came back the next episode. This trait of the character actually helped Phoenix Man as it gave him the ability to come back to life after dying.
  • Too Dumb to Live: Not Phoenix Man himself but rather the character, Birdbrain, that his phoenix costume is based on. Birdbrain kept dying every episode because of his stupidity but always came back the next episode to die again.
  • Took a Level in Badass: After dying and coming back to life as Phoenix Man Reincarnated, he went from a Demon threat who got killed easily by Child Emperor to a Dragon threat who forces the kid hero to use his ultimate weapon.
  • Underestimating Badassery: Even though he acknowledged he wasn't yet very powerful, he still thought Child Emperor, an S-Ranked hero, would be an easy victory. Boy, was he wrong.
    • He then gets put on the receiving end of this by Child Emperor, after his return as Phoenix Man Reincarnated; where the Hero believed that since his barrier defense worked the last time, five layers would also be enough to stop the monster again. Phoenix Man proves that assumption to be equally wrong.
  • We Can Rule Together: Offers Child Emperor a chance to become a monster like him and join his side to make a whole new group.
  • Winged Humanoid: After he Came Back Strong and crossed the Bishōnen Line, he now has this look.

    Gale Wind & Hellfire Flame 

Gale Wind & Hellfire Flame

Gale Wind Voiced by: Taishi Murata (Japanese), Grant George (English)

Hellfire Flame Voiced by: Yasuaki Takumi (Japanese), Tim Friedlander (English)

Debut: Chapter 78 (Manga)

Disaster Level: Dragon

https://static.tvtropes.org/pmwiki/pub/images/galehellfire.png
Hellfire Flame and Gale Wind.

Click here  to see their monster forms.

A duo of ninjas from the same village as Speed-of-Sound Sonic and Flashy Flash who ate monster cells and joined the Monster Association. Despite possessing Dragon-level strength at full power, they are seen as only Executive candidates and prefer to see themselves as mercenaries simply using the Association's resources for their personal ends in exchange for services.


  • The Ace: They are the strongest members of the 37th generation of Ninja their village have produced, which they also claim is the strongest generation their village produced in general. Flash, after cutting them down, does acknowledge with their speed and power they might have stood a good chance of defeating just about any other S-Class hero in the assault.
  • Adaptational Badass: In the original webcomic, their only appearance was getting instantly defeated by Flashy Flash. In the manga, they're Dragon-level threats at full power capable of keeping up with Flashy Flash in speed, however it's shown that they never stood a chance anyway.
  • Arachnid Appearance and Attire: Gale Wind uses cobweb-like razor wire and even gains 4 spider legs coming out of his head in his monster form.
  • Archenemy: They've got some serious beef with Flash for an unspecified incident in the past. Flash for his part doesn't even know who they are.
  • Back from the Dead: After being bisected by Flashy Flash, their bodies are repaired and reanimated by Phoenix Man Reincarnated to fight Child Emperor, who uses an electrical attack to destroy the corpses but instead restarts their hearts. They decide to leg it out of there.
  • Bishōnen: It seems like most of the ninjas from the village are like this.
  • Department of Redundancy Department: A common naming theme for ninjas from the village.
  • Everything's Better with Spinning: Both use spinning kicks, with Gale Wind using Wind Blade Kick and Hellfire Flame using Flame Blade Kick.
  • Flaming Sword: Hellfire Flame wields one.
  • Freudian Excuse: They were sick of being treated like living weapons as assassins and wanted to take charge for once, so they became monsters to Take Over the World.
  • Foregone Conclusion: The last time they're seen in the Manga is after running into Saitama and declaring they will go look for Flash again. Since they reappeared in the Webcomic along with a group of other Ninjas just in time for Flash to reveal his and Sonic's backstory, it is obvious they will survive the rest of the Monster Association arc and any other encounter with Flash they might have. This is a more recent web comic revelation which subverts their original foregone conclusion, where they were expected to stay dead or get killed off again because their original web comic counterparts were killed off.
  • Half the Man He Used to Be: To both of them by Flash with a single strike.
  • Hard Work Hardly Works: In their quest to Take Over the World they turned to monsterization as a short-cut to gain power, rather than through training. It ultimately gets them killed by Flash, as they aren't able to fully control their speed and wild attacks, and are bested by his more deliberate movements and precise timing.
  • It's Personal: Hilariously a trait of ninjas from their village; they can't stand any outsiders seeing through their moves. After being resurrected by Phoenix Man, they run into Saitama who dodges them easily. They proclaim that they won't forget that and will come for him later just like Sonic did before and Flash will after them.
  • Kukris Are Kool: Gale Wind wields a pair of them.
  • Long-Haired Pretty Boy: Gale Wind, like Sonic, is exceptionally feminine in looks.
  • Ninja: They are the seniors of Sonic and Flashy Flash, coming from the same training village.
  • One-Winged Angel: In their human forms they classify as Demon-level threats, but can transform into their monster forms which boost their powers to Dragon.
  • Playing with Fire: Hellfire Flame, as his name suggests, can create flames with his attacks. His own version of Wind Blade Kick is even called Flame Blade Kick.
  • Power Levels: In the original webcomic, they were Demon-level robots who were easily dispatched by Flashy Flash. In the manga, they're Demon-level threats in their human forms but as monsters, they're Dragon-level threats.
  • Razor Floss: Gale Wind attempts to use these against Flashy Flash to restrict his speed, noting they're tough enough that if Flash runs into them at his full momentum, he could cut himself apart. Flash deals with it by destroying the walls the threads are attached to and making them useless.
  • Retcon: In spirit, at least, although not technically. In the webcomic, they were robots named Hellfire and Gale who were instantly killed. Then in the manga, they were ninjas named Hellfire Flame and Gale Wind who were killed but revived. And then eventually the ninjas Hellfire Flame and Gale Wind show up alive and well in the webcomic, despite how the robots they originally were (out of story) being dead. Presumably in this case the reader is meant to assume the robots "Hellfire" and "Gale" are completely different beings from the ninjas "Hellfire Flame" and "Gale Wind" and just coincidentally had similar names.
  • Spared by the Adaptation: They get revived by Phoenix Man accidently, but seem to lose their memories of losing and dying and proceed to run around looking for Flashy Flash. The ninjas then show up alive later on in the web-comic too, possibly because the dead robots they were based on were different enough to be considered separate unrelated characters from them.
  • Super Speed: They can easily keep up with Sonic in their human forms, but severely outclass him as monsters. Their human forms struggle to keep up with Flashy Flash, however, forcing them to use their monster forms to regain the edge. It's still not enough, and Flash proves to be so much faster they don't even know what hit them until they're lying on the floor in pieces.
  • Suspiciously Similar Substitute: They have similar names and abilities with Gale and Hellfire, a pair of robots from the original webcomic.
    • It's been confirmed that they are indeed replacements as ONE based their original designs off other copyrighted characters from his previous studio.
  • Time Stands Still: Their battle with Flashy Flash when in their monster forms is so fast that the explosions from them clashing only happen after the battle is over.
  • Transformation Horror: They are fairly handsome in their human form, but are very ugly in their monsters form. This is probably a factor why they choose to stay in their human forms most of the time.
  • Trauma-Induced Amnesia: Being brought back from death has robbed the last few minutes of their memories before death. From their perspective, they were fighting Flash then suddenly woke up naked on the ground while Child Emperor and Phoenix Man were fighting.
  • Underestimating Badassery: They think they're much better than Flash since they're the strongest ninjas from their generation which is supposedly the greatest their village has ever produced, on top of having monster forms for a power boost. Unfortunately for them, Flash proves to be the greatest ninja from their village ever, and beats them single-handedly.
  • Unskilled, but Strong: They're actually plenty skilled, but it's noted by Flash and confirmed by themselves that while their monster forms boost their powers to incredible levels, they still haven't fully mastered said powers. It's why they changed the location of their battle from the narrow hallways to the wide-open space of their training grounds so they could better use said abilities. The difference in control is shown during their battle; the three move at roughly the same speed but while Flash moves gracefully without leaving a mark, the duo smash through everything because they can't stop themselves in time. It's ultimately the main reason why they lose to Flash, who notes that if they had properly trained themselves to that level of power rather than short-cut it with monsterization, they would have posed an even bigger threat to him.
  • Walk on Water: As ninjas, they can run on water and even run up waterfalls.
  • We Can Rule Together: They give a monster cell to Sonic, offering him a place in the Monster Association.
  • Wreathed in Flames: Hellfire Flame's monster form is partially covered in fire.

Demon-Level Members

    Rafflesidon 

Rafflesidon

Voiced by: Uncredited (Japanese), Bill Rogers (English)

Debut: Chapter 54 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/rafflesidon.png

    Eyesight 

Eyesight

Voiced by: Misako Tomioka (Japanese), Lauren Landa (English)

Debut: Chapter 58 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/eyesight.jpg

  • Death by Irony: She's swallowed whole by Pig God, right after she threatened to eat Child Emperor.
  • Gorgeous Gorgon: She's a bit human-like and has a nice figure, but averts it completely in her One-Winged Angel form.
  • Heat Vision: Like some snakes, she can sense the heat of her preys.
  • One-Winged Angel: After Child Emperor's robot self-destructed against her, she's enraged and becomes more snake-like.
  • The Noseless: In all panels she is shown while in her more humanoid form, her face is flat and smooth.
  • The Paralyzer: Her bites immobilize her victims completely.
  • Poisonous Person: Her venom's potency can range from paralyzing humans to killing large monsters.
  • Snakes Are Sinister: She certainly is, especially in her One-Winged Angel form.

    Do-S 

Do-S

Voiced by: Natsumi Fujiwara (Japanese), Wendee Lee (English)

Debut: Chapter 59 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/do_s.png

  • Alas, Poor Villain: In the original version of chapter 103, Do-S was seen begging for her life only to have her throat crushed by Sweet Mask, making the reader pity her gruesome fate. This was changed in a future revision to make Sweet Mask seem less evil.
  • Ambiguously Bi: The Depraved Bisexual variation if she truly is bisexual. She seems happy to turn anyone into her "love slaves" regardless of gender, engages in flirty dialog towards Fubuki while stating a strong desire to enthrall her specifically, and then later propositions Sweet Mask into sleeping with her.
  • Cute Monster Girl: It helps that she looks almost human.
  • Designated Girl Fight: It was inevitable that her first major battle would be against a fellow Ms. Fanservice in the form of Fubuki.
  • Dominatrix: Her look combined with her power to transform people in "love slaves".
  • Expy: Of Mileena. Like Mileena, she wears clothing that reveals her attractive body and wears a mask that conceals her sharp-toothed mouth.
  • Fashionable Asymmetry: Her thigh-high boots and gloves are mismatched and she wears a flower on one side of her hair.
  • I Love You Because I Can't Control You: Do-S claimed that she "wanted her more", after Fubuki was able to resist her mind control. Although this is later subverted when Do-S drops her flirty attitude towards Fubuki after she injured Do-S, and Do-S decides to kill Fubuki instead of enslaving her.
    • Comes out again when she encounters Sweet Mask, who she definitely can't control, which only makes her gush more over him.
  • Intercourse with You: She blatantly proposed Sweet Mask to have sex with her, in exchange of that she "might" release her slaves from the brainwashing. Sweet Mask didn't really appreciate that. At all.
  • Glasgow Grin: She hides a particularly jagged and large one underneath her mask.
  • Know When To Fold Them: After having seen how Tatsumaki brutalized the other monsters, she attacked her with her mind-controlled slave so she could run away.
  • Monster Fangirl: Inverted. Do-S is the monster yet she's shown to be a sincere fan of Sweet Mask and his shows. She even expressed joy to finally be able to meet him. Though she was completely ignorant of Sweet Mask's true nature.
  • Ms. Fanservice: A monster that resembles a human female dresses in a BDSM outfit made of straps and held by metal rings revealing her fit and voluptuous figure.
  • Mind Manipulation: Do-S possesses the ability to control the minds of others. She achieves this by hitting them with her whip. Those who are controlled by her, have heart-shaped pupils and are referred as her "love slaves".
  • Oh, Crap!: After whitnessing Tatsumaki's attack.
  • Overly Long Tongue: It's usually hidden behind her mask.
  • Suspiciously Similar Substitute: Of Goddess Glasses from the original webcomic.
    • It's been confirmed that she is indeed a replacement as ONE based her original design off another copyrighted character from his previous studio.
  • Villains Want Mercy: In the original version of chapter 103. After seeing her love slaves being mercilessly slaughtered, she quickly surrendered and begged Sweet Mask to spare her life; in exchange she'll do anything he wants. Unfortunately for her, Sweet Mask desired nothing but her gruesome death.
  • Whip It Good: She has shown great skill with her whip in combat. She is able to dish out multiple hits with just a single crack of her whip. Plus, Do-S uses hypnosis in unison with her whip in combat.
  • You Have Failed Me: She nearly got the same fate as Awakened Cockroach for running away from her battle, but Psykos convinced Orochi to let her live since there was still use of her powers.

    Awakened Cockroach 

Awakened Cockroach

Voiced by: Naoya Nosaka (Japanese), Joe Zieja (English)

Debut: Chapter 63 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/awakenedcockroach.jpg

  • Ain't Too Proud to Beg: He was screaming for mercy, only for Orochi to eat him alive.
  • Life-or-Limb Decision: When Genos blocks his movement, he sacrifices his feet to get away.
  • Multi-Armed and Dangerous: Has eight limbs, six are arms.
  • Oh, Crap!: When Genos stopped him and was about to destroy him.
  • Smug Super: Awakened Cockroach is confident in his abilities. He prefers targeting heroes in contrast to other monsters, and gave Genos a run for his money.
  • Spider-Sense: His senses are far beyond the norm. Even if his opponent could attack at the speed of light, he/she still would not be able to hit him because his body developed a sixth sense; being able to sense killing intent and dodges attacks on its own in advance.
  • Super Speed: He possesses an incredible amount of speed and sharp reflexes, being able to fight on par with Genos.
  • You Have Failed Me: Because he ran away from Genos, Orochi ate him alive in front of all the monsters at a meeting to show the others how he will treat cowardice amongst his followers.

    Face Ripper 

Face Ripper

Voiced by: Yuya Murakami (Japanese), Patrick Seitz (English)

Debut: Chapter 63 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/faceripper_3.png


    One-Hundred-Eyes Octopus 

One-Hundred Eyes Octopus

Debut: Chapter 58 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/hundredeyesoctopus.png


    Rhino Wrestler 

Rhino Wrestler

Voiced by: Ryou Sugisaki (Japanese), Richard Epcar (English)

Debut: Chapter 58 (Manga)

Disaster Level: Demon (Formerly Tiger)

https://static.tvtropes.org/pmwiki/pub/images/rhinowrestler.png

  • Blood Knight: He wants a Worthy Opponent to show off his strength. Was disappointed when the heroes he found were too weak.
  • Combat Commentator: He enjoys giving scores to every attack against him.
  • Elite Mook: Was apparently first ranked as Tiger with a lot of the other monsters, but Gyoro Gyoro later notes he became strong enough to classify as Demon-level, and proves it by dominating in his fight with all the lower ranked Heroes hand picked for the rescue mission up to Iairon as the second ranked A class. It takes Atomic Samurai stepping in to kill him.
  • Rhino Rampage: He's some sort of rhino monster.
  • Smug Super: He scoffs at other monsters discussing the benefits of battle matchups, claiming that he can just brute force anything in his way.
  • Super Strength: Is incredibly strong, able to make a giant punching bag made of giant tires and chains rock with each blow and then ram clean through it.
  • Super Toughness: None of the A to C-class heroes (who fared pretty well against a horde of fodder monsters) do much damage to him.
  • Unwitting Pawn: Gyoro Gyoro apparently encouraged him to charge right at the Heroes, and assured he'd even be a match for the S-ranked ones. Naturally, he dies as soon as one fights him, and this was all seemingly so that Gyoro Gyoro could observe the Heroes, and come up with the best way to use the Dragon-level monsters.
  • Wrestler in All of Us: His name gives this.
  • You Are Already Dead: He was on the receiving end of this by none other than Atomic Samurai. He even gives him a score of 100 before he turns into Ludicrous Gibs.

    Free Hugger 

Free Hugger

Debut: Chapter 59 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/free_hugger.jpg

  • Combat Sadomasochist: Not the monster itself, but the solution Puri Puri Prisoner comes up with to beat him is to give a crushing hug and just love the pain it causes.
  • Schmuck Bait: A giant porcupine with a sign that says free hugs.
  • Stone Wall: He never actively does anything, but stand around and let his enemy injure themselves on his sharp hair when punching him.
  • Spikes of Villainy: His hair covers most of his body to stick out into hundreds of razor sharp spikes.
  • Stating the Simple Solution: Many normal citizens observe how Puri Puri Prisoner could win easily if he simply attacked with the ball and chain he still has instead of punching Free Hugger. Unfortunately they're too far away for the S-Class Hero to properly hear them, and he comes up with another solution instead.

    Pureblood 

Pureblood

Voiced by: Uncredited (Japanese), Doug Erholtz (English)

Debut: Chapter 60 (Webcomic), Chapter 59 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/vampiah.png

  • 0% Approval Rating: With his tendency to feed on monsters and extreme arrogance, none of the other monsters likes him. It's even to the point that when Zombieman shows up, a crowd of them lets the hero through without a fight in the hopes the S-Class will kill him for them.
  • Animal Motifs: Bats.
  • Art Evolution: In his first brief appearance, his Victorian clothes, hair style, and facial structure were a more classical depiction of a Vampire. In later scenes his clothes change to a more sinister look and his hair becomes more wild to give him a more fiendish appearance.
  • Bad Boss: Uses other monsters to replenish himself.
  • Blade Below the Shoulder: He has two large ones which resemble bat wings.
  • Bullet Catch: Apparently quite common. And he can fire them back using his fingers.
  • Fantastic Racism: He thinks that transformed monsters are inferior to true born monsters like himself, seeking to kill them off too after dealing with the heroes. The other monsters, in return, despise him and were actually hoping Zombieman would kill him.
  • Lightning Bruiser: Fast enough to dodge and catch Zombieman's attacks and strong enough to tear him asunder with a direct hit.
  • Off with His Head!: How he was defeated, though he could still talk afterwards briefly before expiring.
  • One to Million to One: He can turn himself into thousands of bats.
  • Our Vampires Are Different: He was born a monster, apparently, and looks down upon other monsters, especially former humans. He claims to be the descendant of a long line of vampires.
  • Vampiric Draining: He can heal himself by draining the blood of others.
  • Victory by Endurance: The only reason why Zombieman managed to defeat him. Pureblood is stronger and faster than the S-Class Hero, even possessing a powerful Healing Factor of his own, but that doesn't help when your opponent is practically immortal. 30 minutes of constant fighting and after 200 consecutive victories for Pureblood, Zombieman manages to defeat him.

    Fist Fight Djinn 

Fist Fight Djinn

Voiced by: Uncredited (Japanese), Jarred Kjack (English)

Debut: Chapter 60 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/fistfightdjinn.png


  • Arrogant Kung-Fu Guy: As a human, he participated in many tournaments but it did not satisfy his bloodlust. After turning into a monster, he became even more overconfident in his abilities.
  • Blood Knight: He was once a boxer who lusted for power so much that he turned into a monster.
  • Curb-Stomp Battle: He thought he could take on Bang and got turned into a lifeless pile before he could land a hit on him.
  • Multi-Armed and Dangerous: He has 4 arms.

    The Three Crows 

The Three Crows

Debut: Chapter 71 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/the_three_crows.jpg

  • Bird People: Were once martial arts disciples of Gouketsu, but all three became giant humanoid crows upon monsterization.
  • I'm a Humanitarian: Noted by Gouketsu to have a love of eating martial artists.
  • Was Once a Man: Gouketsu says that they were once humans who consumed Monster Cells, but eventually their monstrous nature overcame them and they lost their minds. Now they're little more than animals trained to follow Gouketsu's orders.
  • Worf Effect: Get taken out rather quickly by Lightning Max, Snake Snek, and an injured Suiryu.

    Royal Ripper 

Royal Ripper

Debut: Chapter 55 (Webcomic), Chapter 86 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/royalripper.png

  • Abnormal Limb Rotation Range: He can rotate his arms more than 360°.
  • Ax-Crazy: Loves to cut up people, especially children, for fun.
  • Blade Below the Shoulder: His forearms are long blades.
  • Curb-Stomp Battle: After Garou recovers from his near-death experience and breaks back into the Monster Association, Royal Ripper loses in seconds once they clash. Granted, part of it can be chalked up to Garou's surprise attack, but given how easily he destroyed Ripper's arm blades, it likely would have ended just as quickly had they faced off fair and square.
  • Death by Irony: Garou disposes of him by slicing him to pieces with his Whirlwind Iron-Cutting Fist.
  • The Dreaded: Tareo, the young hero fanboy that Garou sometimes hangs out with, immediately recognized him from the monster section of the hero catalog, and begins hysterically crying.
  • Early-Bird Cameo: A picture of him appeared in the urban legend monster section of the hero catalog of Tareo in Chapter 49.
  • Evil vs. Evil: Often butts heads with Garou, and begins a fight with him in Chapter 134.
  • Not Bad: After spending so much time mocking Garou, he admits that he's actually strong after they fight...for a human.
  • Stringy Haired Ghost Guy: His hair is long, wild, and wispy.
  • Sadist: Has an obsessive compulsion to torture and kill, but is most fond of killing kids.
  • Tempting Fate: Is convinced Garou is dead after having slashed him multiple times. We know this won't end well...and sure enough, it does not when Garou comes calling to collect Tareo.
  • The Worf Effect: An interesting example. When he and Garou clash (with Bug God backing Ripper up, admittedly), it's a pretty even fight, albeit with Garou on the losing end. After Garou recovers from his near death experience and gets his power boost, Royal Ripper is quite literally tore apart in Round 2 once Garou finds him again.
  • Would Hurt a Child: He especially loves to target children, and was about to cut up Tareo before Garou got to him.

    G5 

G5

Debut: Chapter 86 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/g5_profile.jpg
A Battle Machine God created by the Organization to sent to join the Monster Association
  • Awesomeness by Analysis: Is able to scan and copy Atomic Samurai's swordplay; allowing him to keep up with the S-Class Hero. At least for a little while.
  • Enigmatic Minion: Openly states to being a part of another mysterious organization with their own goals when joining the Monster Association.
  • Extendable Arms: Displayed the ability to stretch it's arms across a corridor to throw a random monster for Great Food Tub to eat.
  • Katanas Are Just Better: Is shown with two of them.
  • Killer Robot: Is what it appears to be.
  • Know When To Fold Them: When his outer-shell gets sliced to pieces by Atomic Samurai, his core body retreats through the smoke and disappears before it can be seen.
  • Meta Mecha: Like G4, he's actually a smaller robot piloting a larger mech suit. In fact, Genos notes it's actually an upgraded model from G4, though he has no trouble finishing it off considering his own considerable upgrades.
  • No-Nonsense Nemesis: Unlike his G4 predecessor's challenge to King, G5 doesn't waste any time when he comes across Child Emperor and the hostage. He just attempts to eliminate the enemy once he identifies them.
  • No-Sell: First gets shot off-screen by Child Emperor's miniature tank automation and destroys it while coming around the corner seemingly unharmed. Then it lets him set up his Bug Net electrical trap designed for nullifying robots and cuts through the entire thing after letting it shock him with no signs of being affected, prompting a legitimate Oh, Crap! from Child Emperor for the first time. Child Emperor has to bring out his Mad Dog: Underground Cerberus robot and fire several missiles that coat G5 in sticky fluid to slow him just to pull a retreat.
  • Samurai: Has this as a general design.
  • Spikes of Villainy: Is an evil robot with a samurai motif that rivals the Shredder in sharp-edged design.
  • Underestimating Badassery: Averted. It actually thought it was being looked down upon when Child Emperor sent Mad Dog: Underground Cerberus to fight it, but then the hero fires several mini-missiles that cover it in sticky slime all for the purpose of delaying it enough for them to run away.
    • Then he later underestimates Atomic Samurai's badassery and his outer shell is easily cut to shreds before he manages to retreat.

    Bug God 

Bug God

Debut: Chapter 54 (Webcomic), Chapter 86 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/bg_4.png

  • Big Creepy-Crawlies: He's a humanoid insect that towers over most humans.
  • Curb-Stomp Battle: Receives one thanks to Superalloy Darkshine. The latter withstands all of Bug God's attacks entirely unscratched and retaliates with a One-Hit Kill.
  • Extra Eyes: Has five of them.
  • Multi-Armed and Dangerous. Grows 4 more arms along in his One-Winged Angel form along with his standard pair.
  • No-Sell: Tanks both Garou's hits and Royal Ripper's redirected slashes without taking a scratch.
  • One-Winged Angel: He transforms into a bigger more insectoid monster when fighting Darkshine. Not that this helped him any.
  • Smug Super: Incredibly confident in his strength, believing that monsters on the whole are superior to humans and that throwing away their humanity was a necessity for their greater power.
  • Super Strength: He can overpower Garou with ease, slamming him into the pavement and throwing him a considerable distance in the air. However, he is still outmatched due to the latter's superior speed and skill.
  • Super Toughness: He is one of the more durable Demon-level monsters.
  • Underestimating Badassery: He believed he alone would not only be enough to defeat Superalloy Darkshine, but would easily overpower the S-Class Hero. As it turns out, it was Darkshine who would easily overpower him.

    The Great Food Tub 

The Great Food Tub

Debut: Chapter 58 (Webcomic), Chapter 89 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/great_food_tub.png

  • Just Eat Him: Threatened this on all the heroes, and was ultimately on the receiving end from Pig God.
  • Lizard Folk: Appears to be a giant humanoid bearded dragon.
  • Villainous Glutton: It seems to always be hungry and will eat anything, even other members of the Monster Association.
  • We Hardly Knew Ye: One of the least shown Demon-level members of the Monster Association, both in webcomic and the manga, killed off in several panels by Pig God in all adaptations.

    Devil Long Hair 

Devil Long Hair

Debut: Chapter 58 (Webcomic), Chapter 89 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/devil_long_hair.png

  • Agent Peacock: Dresses and speaks in a flamboyant manner.
  • Bishounen: Very pretty-looking for a monster.
  • Combat Pragmatist: Will hide his hair under rubble and attack using his enemies blind spots when fighting Atomic Samurai's apprentices. When that doesn't work, he abandons subtlety, and tries to overwhelm them by attacking from all directions at once.
  • Prehensile Hair: He can use it like Combat Tentacles, piercing enemies or blocking their attacks with just his hair.
  • Weaksauce Weakness: Having his hair cut. Getting all of his chopped off in his battle with Atomic Samurai's apprentices ultimately defeats him.

    Centisempai 

Centisempai

Voiced by: Hiromichi Tezuka (Japanese), Imari Williams (English)

Debut: Chapter 56 (Webcomic), Chapter 54 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/seniorcentipede.png

  • Always a Bigger Fish: After Centikohai is killed by Metal Bat, Centisempai emerges.
    • And of course, Centichoro shows up after Centisempai is killed.
  • Big Creepy-Crawlies: Centisempai is a tall as a building.
  • Body Horror: Centisempai has 2 humanoid faces, with one inside another's mouth.
  • Creepy Centipedes: If being oversized centipedes wasn't enough for you, these guys come with disturbing faces.
  • Multi-Armed and Dangerous: Goes without saying as it is a giant centipede monster.
    • It attacked Metal Bat by coiling around him, kicking him repeatedly with successive legs.
  • Senpai Kohai: Senpai to CentiKohai, and kohai to Centichoro.
  • Too Long; Didn't Dub: Just like all the centipede monsters in the official translation. At least it's slightly lessened for the younger two since Senpai Kohai is a popular concept.

    Showerhead, Super Mouse & Unihorn 

Showerhead, Super Mouse & Unihorn

Debut: Chapter 90 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/showerhead.png
Showerhead
https://static.tvtropes.org/pmwiki/pub/images/super_mouse.png
Super Mouse
https://static.tvtropes.org/pmwiki/pub/images/unihorn.png
Unihorn
A trio of Demon-level monsters.
  • All Your Powers Combined: Their combined attack, the Triple Demon Blasting Speed Thrust, involves Super Mouse throwing a transformed Unihorn and Showerhead augmenting the speed with a jet of water.
  • Animal Testing: Super Mouse was a lab rat who got experimented on until he became a monster and broke free.
  • Curb-Stomp Battle: The trio couldn't do anything against Garou, who overpowered them with ease. In the end, they all got wiped out by Overgrown Rover.
  • Everything's Better with Spinning: Unihorn attacks Garou by spinning rapidly like a buzzsaw.
  • Eyes Do Not Belong There: Unihorn has a ton of eyes all over himself.
  • Good Thing You Can Heal: Super Mouse can regenerate from most wounds, capable of healing after Garou sliced him to pieces with his Whirlwind Iron-Cutting Fist.
    • Unfortunately he couldn't heal from being vaporized by Overgrown Rover's energy blast.
  • Made of Iron: Unihorn boasts that he is unbreakable. While he doesn't get damaged by Garou, Overgrown Rover chewed him to bits.
  • Making a Splash: Showerhead can spray any liquid and can control its temperature as well.
  • Rat Man: Super Mouse is a hulking humanoid rat.
  • Villainous Friendship: Unlike most of the other monsters who are at heads with each other, these three seem to be genuine friends.

     Vacuuma 

Vacuuma

Debut: Chapter 105 (Manga)

Disaster Level: Demon

https://static.tvtropes.org/pmwiki/pub/images/vacuuma.png

  • Beam Spam: His second attempt at blasting Puri Puri Prisoner involved just shooting him with multiple powers from his trunks.
  • Cruel Elephant: An elephant monster who's also arrogant, over-confident and not much of a team player to boot.
  • Curb-Stomp Battle: Doesn't even wound Puri Puri Prisoner in any fashion and is taken out in one hit.
  • Extra Eyes: Gains a third eye when he powers up.
  • Hour of Power: After he sucks up a monster, he can use its powers until he eventually has to excrete it.
  • Killed Mid-Sentence: (To Puri Puri Prisoner) "You really are a monst—!!!"
  • Ludicrous Gibs: Turned into utter chunks when his by Puri Puri Prisoner's Dark Angel Rush attack.
  • Mega Manning: After sucking some of the Tiger-level monsters and assimilating them. He takes on their abilities as well.
  • Multi-Armed and Dangerous: Grows multiple trunks after sucking up some of the Tiger-level monsters.
  • One-Winged Angel: After sucking in some Tiger-level monster. He grows bigger, darker looking and grows multi-trunks from his body.
  • Team Killer: Has no problem "eating" other monster just to power himself up.
  • Underestimating Badassery: Called the Tiger-level monster weaklings just because they had the common sense to run from a hero that they combined couldn't harm with their powers. His approach, to suck them all up into himself and use their power, isn't any different and he gets taken down by Puri Puri Prisoner without even putting up a fight.

Tiger-Level Members

    Sludge Jellyfish 

Sludge Jellyfish

Voiced by: Tadanori Date (Japanese), Jason Marnocha (English)

Debut: Chapter 58 (Manga)

Disaster Level: Tiger

https://static.tvtropes.org/pmwiki/pub/images/sludge_jellyfish.jpg

  • Blob Monster: Is a monster made of sludge.
  • Combat Tentacles: Has a few to capture it's prey.
  • Kill It with Fire: After Child Emperor fails to kill him by slicing him up, the Hero pumps him with flammable liquid and lights a match to set him a blaze. He manages to survive this, but then he makes the mistake of getting into the fight between Child Emperor and Evil Natural Water...
  • Small Role, Big Impact: He captures Tareo while Garou is distracted by Royal Ripper and Bug God, and takes him back to the Monster Association's base. This basically is the catalyst that insures Garou remains involved in events, and continually puts him into conflict to develop into a monster himself as Gyoro Gyoro desires.
  • Smug Super: Not so much proud of himself, as much as the Monster Association itself. Boasting to the two captive children, that between the Executives and Lord Orochi the monsters have nothing to fear from even the strongest S Class Heroes.
  • Would Hurt a Child: As a monster he has no qualms about capturing Tareo, or battling Child Emperor.
    • He even attempted to take Zenko hostage, only for Garou to attack him from behind.
  • You Will Be Assimilated: Is killed when Evil Natural Water drains the oil out of his body in order to lower its own freezing point and render itself immune to Child Emperor's freezing attacks, killing him.

    Marshall Gorilla 

Marshall Gorilla

Voiced by: Soshiro Hoshi (Japanese), Brock Powell (English)

Debut: Chapter 59 (Manga)

Disaster Level: Tiger

https://static.tvtropes.org/pmwiki/pub/images/marshall_gorilla.png

  • Almighty Janitor: In a sense, he considers himself more dangerous than a Tiger-level threat, and defeats an A-Class hero with no difficulty. Since Armored Gorilla (who was easily defeated by Genos, an S-Class hero) kills him in one punch, it's likely that he's just a case of Small Name, Big Ego.
  • Curb-Stomp Battle: He defeats Heavy Kong without getting any injury, and is later defeated by Armored Gorilla with a single punch.
  • Killer Gorilla: He's a monster who has the appearance of a gorilla in an army suit.
  • Glory Hound: He says that will not stop defeating heroes until he gets promoted to a Demon-level threat.
  • Good Smoking, Evil Smoking: He's an evil monster who is always smoking a cigar.
  • No True Scotsman: Marshall Gorilla considers Armored Gorilla a traitor to the gorilla monsters because the latter lives peacefully in human society.
  • Knife Nut: He fights using a pair of knives.
  • Stock Animal Diet: Marshall Gorilla is an ape-like monster and has a bandolier with bananas tied to it, but they're actually empty peels that contain his cigars.

    Maiko Plasma & Electric Catfish Man 

Maiko Plasma & Electric Catfish Man

Maiko Plasma Voiced by: Risa Tsumugi (Japanese), Lauren Landa (English)

Electric Catfish Man Voiced by: Uncredited (Japanese), Patrick Seitz (English)

Debut: Chapter 59 (Manga)

Disaster Level: Tiger

https://static.tvtropes.org/pmwiki/pub/images/maiko_plasma.png
Maiko Plasma
https://static.tvtropes.org/pmwiki/pub/images/electric_catfish_man.jpg
Electric Catfish Man

    Mad Doctor Fish 

Mad Doctor Fish

Debut: Chapter 114 (Manga)

Disaster Level: Tiger


    Destrochloridium  

Destrochloridium

Voiced by: Hiromichi Tezuka (Japanese), Sean Chiplock (English)

Debut: Chapter 79 (Manga)

Disaster Level: Tiger

https://static.tvtropes.org/pmwiki/pub/images/destrochloridium.jpg

  • Meat Puppet: It uses human bodies as this, though only one at a time.
  • Mind-Control Eyes: Its victim's eyes appear blank, with an additional pair of eyes on stalks bursting through the skull.
  • Puppeteer Parasite: It enters its host bodies and takes complete control of them.
  • Seldom-Seen Species: It is based of the real-life Leucochloridium Paradoxum, a parasitic worm that uses snails as hosts.
  • This Is a Drill: Its hands are drills that can pierce through steel. It uses them to enter host bodies.

Unknown Disaster-Level Members

    Evil Eye 

Evil Eye

Debut: Chapter 94 (Manga)

Disaster Level: Unknown

https://static.tvtropes.org/pmwiki/pub/images/evileye.png

  • Black Cloak: A long one covers his entire body, resembling the The Grim Reaper.
  • Curb-Stomp Battle: Unfortunately for him, Tatsumaki is way beyond his level.
  • Death from Above: Throws entire apartment buildings at the heroes with his Psychic Powers.
  • Eyes Do Not Belong There: His body is covered with eyes of dead monsters, planted by Gyoro Gyoro to amplify his powers.
  • The Faceless: Its face is fully hidden beneath a cloak. Due to his short-lived Curb-Stomp Battle against Tatsumaki, it's likely it will never be revealed.
  • The Power of Hate: Why the eyes on his arms? The lingering hate of the dead monsters slain by Tatsumaki fuel his power, boosting his telekinesis. For all its worth, it allows him to lift buildings and not being instantly disintegrated by Tatsumaki herself.
  • Psychic Powers: He uses particularly strong telekinesis.
  • Youkai: His appearance is strongly reminiscent of the dodomeki, a somewhat obscure youkai that has long arms covered in eyes and is often depicted wearing a hooded cloak.

    Gyoffrey 

Gyoffrey

Voiced by: Taro Kiuchi(Japanese), Jason Marnocha (English)

Debut: Chapter 70 (Manga)

Disaster Level: Unknown

https://static.tvtropes.org/pmwiki/pub/images/gyoffrey.png

  • Fish People: Is a fat man-sized fish person.
  • Meaningful Name: "Gyo" means fish.
  • Opportunistic Bastard: Attacked a hospital filled with wounded Heroes in order to take the credit for finishing them off. Fortunately, he was stopped by Mumen Rider and Tank Top Master.

    Venus Mantrap 

Venus Mantrap

Voiced by: Uncredited (Japanese), Ryou Sugisaki (English)

Debut: Chapter 51 (Manga)

Disaster Level: Unknown

https://static.tvtropes.org/pmwiki/pub/images/venus_mantrap.png

  • Man-Eating Plant: As it's name and appearance implies, it's a Venus Flytrap monster that presumably eats people.
  • Plant Person: A plant monster that resembles a Venus flytrap.
  • We Hardly Knew Ye: Little is known about him as soon as he made his debut.
  • Worf Effect: One of the first monsters affiliated with the Monster Association to appear alongside Centikohai. He gets brutally killed off-panel by Metal Bat shortly after.

    Centikohai 

Centikohai

Voiced by: Takahiro Yamaguchi (Japanese), Joshua Tomar (English)

Debut: Chapter 51 (Manga)

Disaster Level: Unknown

https://static.tvtropes.org/pmwiki/pub/images/junior_centipede.jpg

    Manako 

Manako


  • Butt-Monkey: Played with. She's being dragged around by Saitama and Flashy Flash against her will and prone to suffering slapstick, but if it wasn't for their presence she would have already died from either being absorbed by Orochi or crushed by the Monster Association HQ being raised out of the earth by Tatsumaki.
  • By the Lights of Their Eyes: She can emit a beam of light from her eye to illuminate her surroundings.
  • Cephalothorax: She's basically a gender-swapped Mike Wazowski, as in she's a Cyclops with entire body is basically a ball with arms and legs attached, with her face taking up the entire "ball."
  • Samus Is a Girl: Saitama, Flashy Flash, and the readers wouldn't have realized she was a girl until she opened her mouth and Saitama idly noted her name sounds feminine.
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