One Punch Man is full of heroes with all them below Saitama in power. But we have not meet all of the top heroes as Blast the number 1 was not revealed until recently. Blast the no.1 hero has been revealed in ch 137 and he has been shown to be as skilled as he is powerful.
“The chapter begins by revisiting Saitama, Flashy Flash and Manako still underground following Tatsumaki uprooting it to attack Psykos. As they stumble around trying to find a way out, they come across a mysterious black cube that speaks to them. Taunting them with the fact that it needs a powerful vessel to give its power (and “collecting” those who don’t match up to that power), they’re soon interrupted when a wormhole opens up behind them.
S-Class Rank One hero Blast then emerges from this wormhole and grabs the cube. Happy that none of them had touched the cube or accepted a mysterious “deal,” he reveals that the cube is a transmitter of some sort that he’s been collecting for “fun.” The cube recognizes him too and is angry, but Blast teleports it away before it can continue talking.
Flashy Flash tries to test Blast’s abilities with a speedy attack, but Blast dodges this instantly without breaking his stride. Telling them to give “Sitch and Tornado” his regards, he then opens up a portal to get Saitama, Flash, and Manako (after confirming the monster wasn’t a prisoner or threat) from the area. Following his absence through the series, Blast’s full appearance in the series has only sparked more questions and mysterious about what he means for the franchise as a whole.“
Article:One-Punch Man Finally Introduces its Number One Hero (comicbook.com)
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