Don't go for his innocent face; Rimuru Tempest is one of the strongest anime characters who can easily defeat Saitama. Saitama can handle enemies in hand-to-hand combat easily, but what about an enemy with magical powers? The list of Rimuru's powers is endless.
Saitama vs cat
[ Still trying to do the math on how, the only thing to ever actually damage Saitama in the series is a cat scratching his face.
That being said, Saitama hasn't used his full power in any of the fights in One Punch Man. However, fans expect him to go all out at some point in the story and are eagerly waiting for the character or the entity that will push Saitama to his absolute limits.
Despite his nickname, Saitama doesn't always defeat his opponents with a single punch. In fact, occasionally, he unloads a flurry of attacks. As the titular character of One Punch Man, it is often expected of Saitama to finish his enemies in no more than one punch.
It's highly unlikely that Saitama will be defeated in One Punch Man. Let's understand why this is the case. Firstly, this series doesn't follow most conventions that a typical shonen series would. This is a gag manga series, and many elements in the manga are not supposed to make sense.
Can Saitama lift 200 quintillion? Gravity is about 1/5th as strong as Earth's on Io, so with a mass of 89.3 x 10^21 kg (half of Io canceling out the one-handedness), Saitama at the time could probably effortlessly lift 16 quintillion tons on Earth.
Goku is an extraterrestrial being who has to lose a fight in order to get stronger. Saitama is a man that can defeat any foe with a single punch. If the two of them were to face off in a one-on-one battle, Saitama would easily win.
Unparalleled Strength: Saitama possesses seemingly limitless physical strength and is capable of effortlessly defeating powerful monsters and villains with a single, casual punch (although this strength is not limited to punches). His punches are so powerful that many monsters simply explode when struck.
One of Saitama's most prominent weaknesses is his lack of combat training. He was able to achieve his god-like strength through a strict work-out regimen, comprising 100 sit-ups, squats, and push-ups, followed by a 10-kilometer run.
Yes,you can see him Spitting Blood/Bleeding.
Boros. Boros was the first on-screen opponent of Saitama that survived after getting punched, much to his surprise. In his fight with Saitama, Boros was hit with 3 normal punches, a Consecutive Normal Punches attack, as well as the shockwave from the hero's Serious Punch.
Saitama Beats God and Destroys the Universe.
He is immortal, so he must live forever... His power isn't all about his body, but he is rather healthy, considering he's still doing his workout, so i reckon somewhere above 100 years, considering he's as normal as everyone else when it comes to basic human things.
Saitama (1000 IQ) VS 1.000. 000 Colossal Titans: 1.000 IQ, 100 IQ, 10 IQ!
The sheer untapped power of Saitama from One-Punch Man beats Dragon Ball's Goku in terms of strength.
Saitama is also theoretically much faster than even the Zero Causality Fist, as it appeared to cause him no strain or fatigue when using it, implying even this isn't his maximum speed. Though Goku may be one of manga's most iconic powerhouses, One-Punch Man's Saitama is closing the distance with every chapter.
Immeasurable Strength: Saitama possesses an immeasurable amount strength and as a result is capable of destroying powerful monsters and villains with a single one punch (though this strength is not limited to punches).
Even though Saitama is back to his usual frame of mind, where he doesn't have to use real strength, chapter 168 is proof that Saitama's strength is immeasurable, and presently there is no known limit for the hero's power.
God is the overarching antagonist of the Monster Association arc in the manga One Punch Man and possibly the entire series. It is a mysterious entity that desires the eradication of all humanity. However, it chooses to remain hidden for the time being and instead grants powers to others who share its thoughts.
Genos. Genos is among the few who are aware of the full potential of Saitama, as he has witnessed him attain effortless victories in multiple fights against formidable opponents.