Because surprisingly, there wasn't one.
Personal names are in katakana and lack surnames. Locations are represented by single letters like "City A" or "City B." Humanity is constantly plagued by disasters caused by various grotesque creatures collectively known as "Monsters." Humans with high combat abilities, such as martial artists, cyborgs, and psychics registered with the private "Hero Association," act as "Heroes" to perform life-saving and monster extermination duties.
A major organization founded by the multi-millionaire Agoni after hearing his grandson's story of being saved by a passing man during a monster attack. Surprisingly, it is a private entity. Three years have passed since its founding at the time Saitama and Genos joined. It primarily supports hero activities by providing funding, housing, and acting as a command center for efficient monster extermination. It is also responsible for investigating evil organizations and certifying threat levels. To join, one must pass a certification exam (70/100 points minimum). Upon passing, heroes are given a Hero Name based on their traits. Heroes are ranked S, A, B, or C based on combat ability, social contribution, and influence. Even if weak, a hero can rise in rank through high social contribution, while a strong hero without results stays low. However, "S-Class" is an exception, chosen purely based on raw combat power.
A general term for extraordinary beings that harm humans; essentially a catch-all for villains, monsters, and kaiju. Even if they aren't humanoid or are robotic, they are generally called monsters. Since Saitama reached adulthood, the number and ferocity of monsters have surged, which led to the creation of the Hero Association. Monster disasters are treated like natural disasters, with danger levels indicated on a 5-point scale. Threat level does not strictly equal power; defeating a "Demon" doesn't guarantee an instant win against a "Tiger." Level: Below Wolf
Combat Power: Can be easily driven away by an unarmed civilian.Level: WolfCombat Power: Equivalent to 3 C-Class heroes or 1 B-Class hero.Level: TigerCombat Power: Equivalent to 5 B-Class heroes or 1 A-Class hero.Level: DemonCombat Power: Equivalent to 10 A-Class heroes or 1 S-Class hero.Level: DragonThreatens the destruction of multiple cities.Level: Above DragonA domain where only extremely limited individuals can respond; likely a national-scale crisis.Level: GodThreatens the extinction of humanity. While not explicitly stated, it is a threat only Saitama could likely face.Level: UnknownAssigned to monsters whose threat level cannot be determined, usually right after they appear.
An organization formed by monsters of threat level "Demon" or higher. Based in a massive facility (referred to as a "shabby hideout" by Psykos) beneath the ghost town of City Z, they aim to destroy the Hero Association and eradicate humanity. It is an elite group consisting of only 17 members.
Hero Name: Caped Baldy
Name: Saitama
Gender: Male
Age: 25
Height: 175 cm
Occupation: Hero (B-Class Rank 63)
Likes: Cabbage, Seaweed
Genos's master, referred to as "Master" or "Sensei."
Personality: Ordinary and relaxed. Always calm even in a pinch. Indifferent and moves at his own pace. Dry but has a sense of justice. He doesn't seem to care that almost no one except Genos recognizes his strength. Appearance: Wears a yellow suit with red gloves and a white cape when active. Self-conscious about his baldness. Combat Ability: Transcendent power surpassing God-level threats. Defeats enemies in one hit even when unmotivated. This is raw strength, not a superpower.
Hero Name: Demon Cyborg Name: Genos Gender: Male Age: 19 Height: 178 cm Occupation: Hero (S-Class Rank 16)
Personality: Cool and serious. Driven by revenge but has calmed down. Respects Saitama and Dr. Kuseno, who turned him into a cyborg. Appearance: Blonde hair, black sclera, and yellow pupils. Handsome. Body is covered in inorganic armor. Combat Ability: High combat power through body modification. Strong even among S-Class, excelling in kinetic vision and reflexes.
Hero Name: Terrible Tornado
Name: Tatsumaki
Gender: Female
Age: 28
Occupation: Hero (S-Class Rank 2)
Sister to Fubuki (B-Class), whom she cherishes.
Personality: High professionalism and pride. Prefers to solve things alone. Sharp-tongued. It's not that she doesn't trust others, she just hates relying on them. Appearance: Slender, petite child-like build with green curly hair and a black slit skirt. Combat Ability: Uses telekinesis to manipulate and throw objects. Often seen floating.
Hero Name: Atomic Samurai
Name: Kamikaze
Gender: Male
Age: 37
Height: 177 cm
Occupation: Council of Swordmasters, Hero (S-Class Rank 4)
Has several A-Class disciples.
Personality: Self-proclaimed hard-boiled sentimentalist. Very confident, only respects those he deems strong. Combat Ability: Incredible sword techniques with slashes faster than sound.
Hero Name: Child Emperor Name: Isamu Gender: Boy Age: 10 Height: 135 cm Weight: 35 kg Occupation: Student, Hero (S-Class Rank 5)
Personality: Genius boy. Licks lollipops to keep his brain working. Occasionally shows his age, asking if he can leave for cram school. Appearance: Small boy with brown hair and blue eyes, carrying a black backpack. Combat Ability: Fights with inventions and weapons from his backpack, mostly themed after school supplies.
Hero Name: King Name: ? Gender: Male Age: 29 Occupation: Hero (S-Class Rank 7)
Personality: Outwardly silent and calm. Good at negotiation. Inwardly kind-hearted and extremely cowardly. Appearance: Muscular with scars on his left eye. Always looks stern. Combat Ability: Style unknown. Everyone just knows he is strong.
Hero Name: Zombieman Height: 174 cm Occupation: Hero (S-Class Rank 8)
Personality: A lone wolf with nihilistic tendencies, but is actually highly cooperative and sensible. Very calm with high insight. Appearance: Short black hair, red eyes, corpse-pale skin. Wears a coat and has a lean, muscular build. Combat Ability: Recovers from fatal wounds. Nearly immortal and excels in battles of attrition.
Hero Name: Flashy Flash Name: ? Age: 25 Height: 172 cm Occupation: Hero (S-Class Rank 13)
Personality: Cold expression, rarely smiles. Proud and takes absolute pride in his speed. Appearance: Beautiful with long pale blonde hair and blue eyes. Combat Ability: Uses his sword, Instakill. Fights with ultra-high speed and powerful techniques.
Hero Name: Metal Bat Name: Bad Age: 17 Height: 168 cm Occupation: Student, Hero (S-Class Rank 15)
Personality: Rough and hot-headed delinquent, but loves his sister and pet cat. Has good intuition and is blunt but handsome. Appearance: Black pompadour, modified school uniform. Sharp eyes but good-looking, like a Showa-era delinquent. Combat Ability: Brawling style with a metal bat. Targets weaknesses when facing strong monsters.
Blast / S-Class Rank 1
Hero Name: Blast. Real Name: ?. Gender: Male. A mysterious hero who acts independently. A space-time manipulator.
Silver Fang / S-Class Rank 3
Hero Name: Silver Fang. Real Name: Bang. Gender: Male. Age: 81. Height: 165 cm. Weight: 55 kg. Gentle and playful veteran martial artist. Founder of the Water Stream Rock Smashing Fist. A true powerhouse.
Metal Knight / S-Class Rank 6
Hero Name: Metal Knight. Name: Bofoi. A mysterious scientist controlling high-firepower robots.
Drive Knight / S-Class Rank 9
Hero Name: Drive Knight. Name: Zero. Features a mono-eye mask and black armor. Uses Tactical Transformation to adapt to combat.
Pig God / S-Class Rank 10
Hero Name: Pig God. Gender: Male. A massive man who is always eating. Can swallow monsters whole. Surprisingly sensible for an S-Class hero. If he didn't eat or if he exercised, he'd be a slim handsome man.
Superalloy Blackluster / S-Class Rank 11
Hero Name: Superalloy Blackluster. Gender: Male. A power-type with a steel body polished by intense training.
Watchdog Man / S-Class Rank 12
Hero Name: Watchdog Man. A silent man in a dog suit. High power, speed, and sense of smell.
Tanktop Master / Rank 14
Hero Name: Tanktop Master. Gender: Male. A power-type hero who embodies the hero spirit and the tank top.
Puri-Puri Prisoner / Rank 17
Hero Name: Puri-Puri Prisoner. Name: ?. Breaks out of prison for hero work. Loves men and keeps a harem of criminals.
One-Punch Man
The story is primarily set in a city resembling modern-day Japan.
One-Punch Man
The world of One-Punch Man
One-Punch Man Worldline
Regarding the worldline of the anime "One-Punch Man."
One-Punch Man
The anime "One-Punch Man"
The S-Class heroes have been gathered.

Puri-Puri Prisoner: (I want to use this chance to get closer to Genos-chan! ♡)
Release Date 2026.08.13 / Last Updated 2026.10.13