The Chosen Undead (Dark Souls)
Surviving Saitama’s punches isn’t possible for most living beings, but that isn’t much of an issue for a character who can’t die permanently no matter how hard they try.
Enter the Chosen Undead, the protagonist and player character of the Dark Souls series. Cursed to live for as long as it takes them to prolong the Age of Fire, they’ll come back to life, again and again, no matter how many times they’re smashed, stabbed, set on fire or devoured by horrifying creatures.
It’s a terrible fate to have, but also one which is ideal for a showdown with a being capable of killing them in one blow. Even if Saitama obliterates them with a single punch, they can come back to life and try to land a hit on him through determination, perseverance and a healthy dose of stubbornness.
It may take a while to see any results – after all, the chosen undead won’t have any otherworldly powers they’re attacking Saitama with – but after a few years or decades, they’re sure to start leaving at least a scratch on the overpowered hero.