More than fantasy or even science fiction Ray Bradbury wrote horror and like so many great horror writers he was himself utterly without fear of anything. He wasn't afraid of looking uncool - he wasn't scared to openly love innocence or to be optimistic or to write sentimentally when he felt that way.
I did one sci-fi movie. I did 'Gattaca.' I liked 'Gattaca' because that was always the kind of science fiction I really dug the non-action oriented sci-fi.