One of the strongest characters in the world of anime manga has become very popular at this time, no other than he is Saitama ~ sensei. Characters from the anime One Punch Man has manywhich recognizes kekuatanya because always able to beat the enemy at one stroke.

Immediately following the defeated antagonist character of Saitama :

1. Monster Vaccine

Monsters are similar to Piccolo from Dragon Ball Anime has become the characters first appear in the anime OPM, the monster is said that he is the vaccine of the world to rid the world of human defilement.
Then the hero Saitama confronted him and he was defeated in one blow.

2. Monster Crab

Before becoming as strong today and the time is still kerent tampilanya, Saitama just a young man who failed in finding a job. Then when on the way home, he met a monster crab, and crab monster story begins the one who becomes a monster because of too much then the crab.

In the briefing to explain the monster he sendang looking for children who are her chin like a butt, and then the monster let saitama go as it had a dead fish eyes.

Moments later Saitama meet with the child in the search, now began fighting Saitama that protect children against the monster crabs.

This monster may be the defeated monster tersusah Saitama, Saitama due to bleeding.

3. Human Giant and Big Sister Crazy

When you're shopping, Saitama see the buildings suddenly destroyed ... and when it came out he saw a giant man who continually destroy the city.

then this monster was defeated by Saitama with a single blow, which is unique from this monster is not destroyed even though he was beaten by Saitama.

"It has a power too great ... it's boring."

4.King of the Underground

Morning when they sleep saitama dream of vicious battle with the king of the underground, but when she woke up she found the original underground king and he was very weak ....

5.monster Mosquito

Monster has the ability to control these mosquitoes attacking livestock to strengthen themselves, and genos who know it melawanya fight. After eating so much blood has become very powerful monster, even Genos was to be in danger of being defeated to decide to blow themselves.

Well ... this is where the action Saitama, tabok nyamuknya up his blood splattered ....

6.monster Octopus

After practicing hard for three years saitama unwittingly has become very strong, and he can beat all the enemies with a single blow.

Monster Octopus is one of the first to feel the strength Saitama after practice.

7.Ashura Kabuto

Asura Kabuto is an artificial creature strongest in the House Evolution is supposed to be one of the strongest antagonists. Proven before Saitama describes the details of how he became strong, he had fear in advance of Saitama, proving that he is the only monster that can assess the magnitude of Saitama without the need to fight him.

But after the bald man explained the reason behind the power, Monster ignores his instincts and use the "beserk mode" to attack, then he was lost.
  
Actually a lot of men from the house were defeated Saitama evolution, but would be tiresome if written down one by one. So write her bosses only.
  
Toad-like zoro time in dressrosa.
   
8.Hammerhead

Hammerhead who is chairman of a group of heaven is running protest to the rich man to live no longer need to work, to capitalize a new type of armor weapon he and his group destroyed the building which is owned by the rich.

On the way, when will attack one of the leading men she had been obstructed by the ninja speed of sound. In an instant all the group members lost paradise and Hummer Headpun escape. But unlucky, when fleeing she met and defeated Saitama.

9.Sonic

After hummerhead escape, Sonic was chasing him ... and by chance he met Saitama and suspect her as one of a group of heaven because of his bald head. Well, then began the fight between Sonic against Saitama, with results hit by Sonic goods Saitama.

Sonic is one character who was suspected by some fujoshi Uke.

10.Monster Konbu (seaweed)

In the town where the inhabitants have gone all, appear very powerful monsters that even a hero class A were defeated melawanya. But by chance while looking for another victim, the monster meeting at the bald man ... then beat the monster, causing buildings were destroyed.
Seaweeds of monsters brought by saitama for food, perhaps this is the reason behind the strength of Saitama.

11.King Ocean

In resistance heroes against monsters, rarely heroes confront the monster that is hard to deal with, but when the king of the seas came the people from the Association of heroes lost, including two rated "S" is the hero rank 16 Genos and heroes rank 17 Puripuri Prisoner.

But everything changed when it comes Saitama, Saitama not only survive the blow king of the oceans but also can defeat the king of the ocean with a single blow. And if the note, the weather also changed so bright when Saitama launched pukulanya, this proves that as strong as that Saitama.

12.Lord Boros 

Lord Boros is the character that will appear at the end of the arc in the anime One Punch Man, this character came to earth because he followed the prophecy that said he would meet with strong people who are on Earth.

By traveling for 12 years and in order to find people who can match of the ability, the character who becomes the strongest character in the universe is ultimately down to earth and began to attack.
Then begins the battle was between Saitama with Lord Boror.

Unlike the other characters, Lord Boros could survive the blow Saitama, even amid fighting wasteful Lord was hit by a row of Saitama and he still survived. Until he finally hit a special moment of Saitama and lost, despite losing extravagant Lord alive, and is recognized as the strongest opponent of Saitama.

13.Garou

Garou is one member of the dojo run hero level 'S' number 3 Bang, but because it felt it could not get anything else out of the dojo, Garou kill all members of Dojo, and began the road to becoming the strongest Garou.

Garou continuously challenge the strong man, he pursued the hero of heroes, including the level of S. In the city center inadvertently Garou met with Saitama, and immediately attacked her. Although managed to make saitama foot stuck in the floor of the city, but Garou straight defeat with a slap in the face in his shoulder.

Perhaps there are many characters who are victims saitama antagonist, because it would be very much if at all so just write the main course are included.