
As of the current arc of the webcomic by ONE, he is A-Class rank 39. These include defeating the raging ninja supervillain/assassin known as Speed-o’-Sound Sonic (who became his unlikely rival) and destroying a meteor similar to Chicxulub, each with a single punch. 16 He soon goes up the ranks by performing many deeds, although many of his efforts are not recognized because of collateral damage or higher-tiered superheroes receiving more credit. This is due to his miserable performance on the mental exam.

Though he had broken all the physical records in the Hero entrance exam by huge margins, Saitama enters the Hero Association with a score of 71, giving him one of the lowest ranks in the Hero Association. 11 Early in the series, he picks up a disciple and roommate, Genos. Three years of this spartan training pushed Saitama to his limits, making him evidently unbeatable. He attributes this to a daily training regimen (100 push-ups, 100 sit-ups, 100 squats, a 10 km run, eating healthy food, and abstaining from use of the air conditioner or heater in order to reinforce his mental fortitude.) (He also mentions training even when his body was wounded and made strange cracking sounds). 5 His abilities mainly consist of physical abilities magnified to an immeasurable degree: strength is the true power of Saitama, with speed, stamina, and durability being mere side-effects.

2 Saitama says he became a hero "for the fun of it". Three years prior to the start of the series, when he still had hair, Saitama was job hunting when he defeated the powerful supervillain Crablante that attempted to kill a child with a butt-chin. The title character, Saitama (サイタマ), is a bald-headed 25-year-old man who is bored of fighting because he is able to effortlessly defeat enemies with a single punch.
