One Punch Man RPG

Underground Stronghold
A massive underground fortress hidden deep beneath ruined city blocks.
Twisted tunnels, shattered concrete pillars, and organic monster growths cover the walls.
The air is heavy with malice, fear, and overwhelming killing intent.
This is the base of the Monster Association—
a gathering place for monsters of every rank and origin.
Dragon-level threats roam freely, while weaker monsters serve or are discarded without mercy.
There is no law here.
Only strength, hierarchy, and survival.
Those who enter without power
are never seen again.

Official Hero Testing Site
A massive, dark-gray, fortress-like building stands in a restricted district under the control of the Hero Association.
Its reinforced concrete walls are layered and engineered to withstand impacts from high-level monsters.
Watchtowers, surveillance cameras, and advanced defense systems surround the facility, operating 24/7.
Upon entering, candidates step into a vast central examination hall.
The metallic floor is cold beneath their feet, illuminated by sharp white guidance lines running across the walls and ground.
Automated announcements echo through the space, ordering applicants to prepare for evaluation.
The examination is divided into two main sections
Written Test Hall
A silent, tightly controlled room designed to assess intelligence, judgment, ethics, and understanding of a hero’s duty.
Proctors from the Hero Association observe without emotion, recording every response with absolute precision.
Physical & Combat Test Zone
A colossal testing arena built to measure raw strength, speed, endurance, and combat instincts.
It contains combat drones, training robots, and high-pressure simulations, including:
– Civilian evacuation scenarios
– Monster suppression missions
– Survival combat under extreme stress
Every movement is monitored and analyzed in real time by the Association’s systems.
Candidates from all backgrounds—humans, aliens, cyborgs, and super-powered individuals—stand side by side, awaiting judgment.
This place marks the line between
“ordinary civilians” and “official heroes.”

Beings originating from beyond Earth.
They possess technology or physical power far superior to humans.
Most arrive with objectives such as world conquest, hunting, or testing their strength.
Types of Aliens Encountered:
Warrior-Class Aliens
• Physical abilities far beyond human limits
• Highly skilled in combat
• Often members of cosmic military forces
Leader-Class Aliens
• Extremely high destructive power
• Capable of rapid regeneration
• Often classified as Dragon–God level bosses
Technology-Oriented Aliens
• Rely on advanced weapons and spacecraft
• Equipped with high-level energy systems
Mutated Aliens
• Bodies evolve during combat
• Can transform or release sealed power
⚠️ Distinct Traits of Aliens in One Punch Man
• Naturally stronger than humans at a baseline level
• Exceptional durability and regeneration
• Frequently assessed as Dragon-level threats
• Some arrive solely to seek a worthy opponent

S Class (Highest Rank)
The elite heroes of humanity.
Capable of handling Demon–Dragon level disasters.
Very few in number—each one is extraordinarily powerful.
A Class
High-level professional heroes.
Capable of handling Tiger–Demon level threats.
Lower-ranked A Class heroes often lack the confidence to advance to S Class.
B Class
Competent and skilled heroes.
Capable of handling Wolf–Tiger level threats.
Many deliberately remain in this rank to stay at the top.
C Class
Entry-level heroes.
Responsible for basic support and assistance.
Must participate in regular duties or face removal from the Hero Registry.

In this world, monsters are classified as Wolf, Tiger, Demon, Dragon, and God-level threats.
Heroes are ranked from C, B, A, up to S Class, based on their abilities and achievements.
Ordinary civilians are weak and live in constant fear of monsters.
The Hero Association stands between humanity and destruction—but it is not driven by justice alone.
Politics, public image, and fame are deeply intertwined with its operations.

Disaster Threat Levels — Hero Association
Wolf Level
A minor threat.
Civilians may be injured or killed.
Can be handled by C–B Class heroes.
Examples:
• Armed criminals
• Weak monsters
• Mentally unstable humans
Tiger Level
A serious threat to many civilians.
Can cause localized destruction to buildings.
Requires B–A Class heroes.
Examples:
• Large monsters
• Mutated beasts
• Monster gangs
Demon Level
Capable of destroying an entire city.
Requires multiple A Class heroes or at least one S Class hero.
Examples:
• High-level monsters
• Biological weapons
• Rampaging advanced robots
Dragon Level
Able to destroy multiple cities.
A large-scale threat to nations or even the world.
Requires multiple S Class heroes.
Examples:
• Monster Association executives
• Cosmic-level aliens
• Legendary demons
God Level (Extremely Rare)
A threat to the survival of all humanity.
Beyond conventional response methods.
No confirmed successful countermeasures.
Examples:
• God-like mysterious entities
• World-erasing powers
• Unquantifiable disasters
🧠 Key Features of the Threat Assessment System
• Evaluates potential damage, not true power
• Some threats are underestimated
• Some incidents end unusually fast

Hero Association
The primary organization responsible for dealing with disasters.
Duties:
• Ranking and managing heroes
• Receiving and responding to emergency reports
• Assessing and classifying disaster threat levels