Trivia : Per ONE, although he’s bald, Saitama has hair everywhere else on his body. Saitama had part time jobs as a construction worker and a convenience store worker. Genos can sleep because he has a ‘sleep mode.’ Genos’ face is essentially the same as it was when he was human. Dr. Kuseno slowly aged him up as he grew older. Saitama has not used any of the money Genos brought with him.