Saitama's character on the surface can be best summed up as "average". At first glance, nothing about him strikes anyone he meets or causes them to note anything remarkable about him. Before becoming a hero, he was an average salaryman and did not seem interested in anything initially, though becoming a hero has always been a dream of Saitama's. Before becoming one, he used to be frustrated about society.

He can destroy anything in one strike and it's impossible to dodge or even survive it.