In chapter 3 of Lord of the Flies, we see that the tension between Ralph and Jack is getting stronger. Jack is more concerned with hunting the pig, and Ralph wants to build shelter and keep the signal fire going. The two boys continue to come to blows with each other. Simon is more quiet and keeps to himself. He gets tired of hearing the constant arguments between Ralph and Jack and goes off into the jungle to be alone.
Simon treks through the jungle and helps the younger kids get some fruit from a tree they can't reach. Simon is a good guy, and I think most people take advantage of that goodness. He is seen as odd because he enjoys time alone. Most of the boys can't imagine why he would want to be alone, but to Simon, the solitude is a welcome distraction from the constant noise he has to hear. His looks are also a reason people might find Simon funny and odd.
"He was a small, skinny boy, his chin pointed, and his eyes so bright they had deceived Ralph into thinking him delightfully gay and wicked. The coarse mop of black hair was long and swung down, almost concealing a low, broad forehead."
Simon represents the pure innocence of all the boys. When Simon reaches a spot in the jungle, he just sits and takes in the beauty of the area. Although they are stranded and alone, Simon is able to stop and just enjoy how beautiful everything is.