Aside from the fact that he seemed stupid, he was kind of ugly.
Ugly...? Ahahahhaha I never saw Saitama that way. His hairstyle may not be to mass preference, but he was never ugly lol. Also, he's kinda silly but still far from stupid. He may not be my fave character in OPM, but he's a likable character who would really grow on you. Liking him was really inevitable and I definitely relate with you.
I didn't pay much attention to him, I only noticed his physical appearance; especially his ugly eyes, haha, and then he did everything without much enthusiasm, as if he were stupid. Obviously he did it to go unnoticed. After I started getting to know him, I really liked him, haha.
From this to this, everything changes, don't you think? Haha. The anime just got more interesting.
Ahahahaha he did look kinda stupid and pretty laid-back at some times but I guess that's one of his charms hehe...and yeah, the more you that you get to know him, the more likable he gets.
Haha, yeah, that's why I like it now. jajajajaj