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ワンパンマンSaitama trained so hard that he can defeat any enemy with a single punch, and now struggles with boredom while his cyborg disciple Genos follows him into the Hero Association.
"100 push-ups, 100 sit-ups, 100 squats, and a 10 km run. Every single day!"
Saitama reveals his 'secret' training regimen to Genos in episode 3, to Genos's disbelief. The routine became a real-world fitness meme and sums up the series' joke that there is no secret to his power.
"I'm just a guy who's a hero for fun."
Saitama's answer whenever someone asks who he is, first heard in episode 1 against Vaccine Man. It is the deliberately unimpressive catchphrase of the strongest man in the world.
"I'm not doing this because I think I can win. I'm doing it because I have to."
Mumen Rider, a C-Class hero on a bicycle, charges the Deep Sea King knowing he will lose. His stand is the emotional heart of the first season and earns Saitama's respect.
"I'm not going to hold back. I'm going to hit you with everything I've got."
Saitama tells Boros he will finally use a 'serious' punch in the season 1 finale after Boros's Collapsing Star Roaring Cannon. The Serious Series: Serious Punch that follows ends the fight in one blow.
"If the heroes run and hide, who will stay and fight?"
Saitama's thought before facing the Deep Sea King, after several heroes have fallen. It is one of the few times his heroism is played completely straight.
"I'll leave tomorrow's problems to tomorrow's me."
Saitama's shrug when Genos brings up the Hero Association registration after the Paradise Group incident. It captures his lazy, in-the-moment attitude that the show plays for comedy.
"There's nothing wrong with feeling fear. You just have to bounce back, that's all."
Saitama's remark to Genos after the fight with Boros, when Genos worries about his own weakness. It is the closest Saitama comes to giving actual mentorship.
Watch One Punch Man and experience the scenes that made these quotes unforgettable!