I love Simon--and every passage in the novel in which he is present. He's a very small, quiet, and pensive character who, by comparison, doesn't have very many lines of dialogue. He is, however, the only child on the island who isn't consumed by the idea of a "beastie." In fact, Simon, after his encounter with the Lord of the Flies, is able to recognize that the beast isn't a monster inhabiting the island--it's the evil part that's present in all humans.
Golding takes great care in constructing Simon's character, and many critics liken him to a religious prophet or even to Christ himself--saying that Simon's encounter with the Lord of the Flies is remniscent of Jesus's encounter with Satan in the desert. Simon dies trying to save the others from the idea of a "beastie," thus sacrificing himself for the good of others. In one of the most beautiful passages of narration in the novel, Golding describes Simon's dead body, on the beach, just before it is washed away:
Somewhere over the darkened curve of the world the sun and moon were pulling, and the film of water on the earth planet was held, bulging slightly on one side while the solid core turned. The great wave of the tide moved farther along the island and the water lifted. Softly, surrounded by a fringe of inquisitive bright creatures, itself a silver shape beneath the steadfast constellations, Simon's dead body moved out toward the open sea.
Most of the characters in Lord of the Flies are not particularly likable, including the main character, Ralph. I have always sympathized most with Piggy. He is by far the most intelligent of the boys and one of the most sensitive. He recognizes immediately that the boys' new island paradise will not be all fun and games. Most of his ideas are good ones, but, sadly, everyone judges him by his physical appearance instead. Two of the novels' primary symbols--the conch and the glasses--are attributed to Piggy. Though he is often treated badly by Ralph, Piggy remains loyal to him.