I like this manga so much because Saitama doesn’t change. Other characters developed. bad guys become good. Good guys become bad. but Saitama never changes and always knows the right thing to do. Not corruptible by power.
He is all powerful with respect to defeating anyone.
But at the same time he stresses out with the same things a regular people stresses out with, like losing a wallet, breaking someone’s stuff and owing them money. Even Not being able to smash a pesky mosquito.
But he also appreciates things everyone does, like finding stuff on sale and especially FREE food.