ONE PUNCH MAN: A HERO NOBODY KNOWS

Also known as the Dominator of the Universe, is the leader of a group of alien pirates.

His strength is yet to be matched as he scouts the galaxy to find worthy opponents.

Earthling heroes may prove to be exactly what he is looking for.

Former human that turned into a perverted crustacean-shaped monstrosity after ingesting too much crab.

He was also the first monster to ever cross Saitama’s path, when he still had some hair.

Crablante opened his eyes on his potential as a Hero.

A-rank hero and well-known contender for the Super Fight tournament, the martial artist relies on his enhanced speed and strength to take down his opponents.

After defeating a snake-type monster, he made a suit out of its skin and now wears it as a trophy.

Jailed because of his tendency to assault other males, he is nonetheless an S-rank hero and a force to be reckoned with.

Acting as the leader of a gang of prisoners, the flamboyant hero escaped from jail to protect civilians from the Deep Sea King.

Upon powering up, his muscles mass increase, tearing up his suit and leading him to fight naked!  

An A-Class hero well-known for having a thick mustache, Spring Mustachio is an intellingent man and an expert swordsman using his rapier which makes him a formidable and powerful opponent. 

The Child Emperor is a 10 year old S-Class Rank and the 5th professional hero of the Hero Association.

He is currently the youngest hero with his own laboratory in Y-City and is a real genius, and a powerful hero through tactics and gadgets.

Handsome Kamen Amai Mask is the 1st ranked A-class hero of the Hero Association.

He also is the most famous singer, actor and model in the world.

Perfectly skilled and a powerful fighter, Sweet Mask is an impressive opponent thanks to his speed, reflexes and strengths.

The fight is fierce. The Subterraneans, who have been living beneath our world for centuries, emerged to destroy Humanity. Saitama struggles hard against them, he has not felt this kind of adrenaline for a while. When the Subterraneans King arrives to end it with the wounded Hero that destroyed all of his people… Saitama wakes up and realizes that it was all just a dream. 
[Alternative version of Saitama without immunity to attacks] 

General at the top fighters of the Dark Matter Thieves. Melzargard has several abilities thanks to his 5 different personalities compiled in one body. Each personality has a nucleus and destroying it is the key to get rid of this alien.

Stinger,  10th A-class hero, is a young talented spearman who jumped up to the top of class A in about half a year.
Given his strong personality, he is a proud and fierce hero who never gives up.

Metal Knight is a remotely controlled robot, 6th S-class hero from the Hero Association. Its creator whose real name is Bofoy is a real genius, technology expert and builder of the Hero Association’s Headquarters. Beware of his dangerous canons and his sturdiness.

A young C class hero who joined the army led by Tank-top Master. Tank-top Tiger is the younger brother of Tank-top Black Hole. 
Be ready for his “tiger-like” fighting style!

B-class hero and the older brother of Tank-top Tiger, Tank-top Black Hole is a confident and stubborn opponent. 
His attacks are powerful and impressive.

Tank-top Master is the leader of the Tank Topper Army. An impressive S-ranked hero with strong fighting skills and strength. 
He is a model for all his disciples.

A S-ranked-teenager hero. 
Despite his young age, he is a real master when it comes to fighting with his bat, and an even tougher opponent with his Fighting Spirit.

A monster born from the accumulated pollution generated by human beings. He came on Earth to eradicate humankind.

A monster created in the "Evolutionary House" that manipulates a group of mosquitoes to collect blood and turn it into energy.

The evilest creature ever born out of the "Evolutionary House". Even Genos himself was unable to defeat such a powerful enemy.

The ruler of the sea, the pinnacle of a pyramid that includes every living organism in this world. He plans on domesticating the human race.

Self-proclaimed "The strongest and fastest Ninja", Speed-O'-Sound Sonic is self-confident facing all the enemies that cross his path.

Bicycle ride of justice! Mumen Rider is a C class hero on patrol every day, ready to fight all kind of enemies to save lives.

The younger sister of Terrible Tornado, Hellish Blizzard is a powerful telekinetic at the head of the Fubuki clan.

He is regarded as Earth's best swordmaster and one of the strongest heroes, even within the S-rank class.

Beneath his old man appearance lies a seasoned martial art expert. Silver Fang is the 3rd S rank hero.

An Esper wielding psychic powers capable of crushing displays of power. She is the 2nd S rank hero, just behind the mysterious Blast.

Genos miraculously survived the murder of his family, left between life and death, he got rescued and turned into a Cyborg. He became Saitama's disciple, and quickly a S rank hero.

100 Push-ups. 100 Sit-ups. 100 Squats. 10Km running. Every single day for three years. Saitama became the strongest man on earth, able to defeat all his enemies in one single punch.