Outside of his heroes friends (Genos, Bang, King, Fubuki, etc.) , AFAIR Saitama is never seen in the anime with other friends. Does Saitama have any friends outside the heroes ones? Why doesnt nobody from his former heroe life appear in the series?
I've just read one of the last chapters of the webcomic, and Tatsumaki asks him exactly this, that if he has any friends and
when it was the last time he met with someone outside of the hero association, to what Saitama can't answer.
And Tatsumaki calls him a lonely baldy