Awesome: One Punch Man

  • While yes, Saitama can NOW kill monsters with a single punch, perhaps his greatest moment of badassery so far is in the second chapter, during the flashback of his fight with a crab monster. This is when he was just an ordinary guy with no powers. Said monster is initially wiping the floor with Saitama, until Saitama loops his necktie around one of the monster's eyes, and rips it out.
  • The "Sparring" two parter with Genos. Genos goes for a massive blast that Saitama appears to dodge, but Genos was expecting that and charges at him landing a rain of punches that tear apart the side of a mountain just as his previously fired blast hits. Only for him to discover that what he tackled wasn't Saitama but an after image.
    • How does the spar session end? Adhering to the rules not to hold back, Saitama prepares to punch Genos but pulls back and hits him with a forehead flick at the end. The after effect of his attack still manages to destroy the mountain behind the two completely.
  • For a manga that deconstructs shounen tropes, it still managed to play one straight: namely, Saitama telling a Class-B Hero to never give up on working hard to advance beyond their limits. This is after Saitama kills a giant propeller fan with one punch that a previous S-class hero (ranked 2nd) didn't completely destroy after it wiped out the B-rank hero's similarly ranked comrades.
  • Saitama gets another one when after destroying the meteor, two Tank Top heroes try to ruin his reputation, then attempt to execute him in public. While the result was obvious, his speech on why he's a hero in the first place to the ungrateful masses that they roused "let me make one thing clear! I'm not working as a hero to make you morons admire me! I do it because I want to!!" was just plain awesome.
  • Licenseless Rider versus the Sea King, an unpowered C-class hero against an unstoppable monster, knowing he has no chance, but doing it because there's no-one else. Though he doesn't win, he saves Genos' life and buys enough time for Saitama to arrive. He even wins Saitama's respect for putting up a good fight.
  • Saitama's fight against the Sea King. While it does end like pretty much all of his fights thus far, it is such an epic and devastating punch that its scope is simply... breathtaking. Even the crowd that witnessed it was awestruck. This could easily be said to be the strongest punch he has given so far.
    • What makes it truly impressive is not just the power, but the SPEED! It's so fast that we don't even see the moment of the impact, just the aftermath.
    • Don't forget about the aftermath where he praised the other heroes for being there by lying to the civilians that the other heroes had weakened the Sea King so he could finish it off.
  • Tatsumaki stopping a whole bunch of missile things thanks to her psychic powers, and sending them back to the Alien starship which fired them like it's nothing.
  • How Saitama defeated Boros: He punched back his Planet Buster Roar Cannon that can destroy Earth's surface and not only did he utterly annihilate Boros, he also ended up destroying his massive ship and clearing a large part of the atmosphere from the clouds by creating a massive gap in the sky that was easily multiple kilometers in length and width, reminiscent to how Moses parted the Red Sea, all through the sheer shockwave effect that he released through that one punch.
    • Not only that, but Boros' dying words implied that Saitama was still holding back during their fight. He split the sky with a punch, and that was still not his full power. Way too strong indeed...
  • At a meeting with nearly every single villain in the city, and three A class heroes, Garou defeats every single one of them with extreme ease. He even breaks the arm of a A ranked hero twice his size and knocks him out with one punch. This guy is the monster version of Saitama, but with lots of hair!
  • Another great speech made by Saitama was when he was confronted by Fubuki A.K.A Blizzard of Hell. Fubuki attacks Saitama because she feels threatened by how fast he has gone up in the hero association's ranks. When she tries to force him into working under her his response is "You won't survive. You just don't get what being a hero is about. There are all kinds of powerful bad guys in the world. Heroes are the ones who oppose them, even if they are alone. If you just gather people who are weaker than you, you won't last. You'll end up crying when a monster appears that's stronger than you. Your subordinates won't be able to save you. Factions? Newbie crushing? Holding your rank? That has nothing to do with anything! Don't look down on heroes you moron!"
  • Speed of Sound Sonic eventually reveals one of his more powerful abilities: Speed Clones. In particular he is capable of making ten clones at a given time, which Genos considered impossible for a human to do and was revered by Sonic to be the only technique capable of killing Saitama. Then Saitama busts one of the moves from his "Serious Series"... and reveals that he can create hundreds of speed clones .
  • When Lightspeed Flash mistakes Saitama for a monster, his first response is to use his Lightspeed Slash attack. Saitama dodges it like it was nothing. He tries the same attack again just to make sure it wasn't a fluke and Saitama performs a Bare-Handed Blade Block with one hand. And once again, neither of these really push him to his limit; he doesn't even use his serious series moves or anything. Saitama just casually dodges and blocks faster than the speed of light.