Saitama is the main protagonist in One Punch Man, as well as the most powerful hero alive. As the title suggest, he is able to defeat any monster he comes up against in one punch. Due to this he faces a self-imposed existential crisis, as he too overwhelmingly powerful to gain any thrills from his battles, so he registers in the Hero Association along with his sidekick Genos.
One – Punch Man is an ongoing Japanese superhero parody webcomic created by an author using the pseudonym One, which began publication in early 2009. It runs from October 5, 2015 – present.