As an allegory, Lord of the Flies presents characters as representative of human qualities and types. Piggy, whose hair is thin, his stomach paunchy, his eyes myopic, appears as a middle-aged man rather than a boy. It is Piggy, too, who suggests using the conch as a horn to summon the others to assemble for meetings using parliamentary procedures. Knowing that rules and order hold together society, Piggy is always disturbed when people speak out of order, or do not behave appropriately because he is representative of civility.Thus, Piggy is the intellectual and rational faculty in humans, characteristics more typical of adult men than boys.
In Chapter 10 Piggy certainly figures as an adult who steps up to hold Ralph together after the brutal slaying of Simon. He tells Ralph,¨We can't do no good thinking about it, see?¨ Further, he coaches Ralph to keep everything that happened secret for the sake of the others, and he encourages Ralph that he and Sam and Eric will help him keep the fire going.
Piggy is very different from the other boys, not only in appearance but in the way he thinks. He followed rules and was very intelligent. The other boys saw this, which is why they made fun of him. Children usually consider adults to be very different from themselves, and the boys in this book thought Piggy was completely different. He resembles a man more than a boy.
Piggy is shown being closely tied to the world of grown-ups because unlike the other boys, he makes logical decisions, takes his time to think about solutions, and also explains his reason for his decision.
Majority of the boys on the island makes their decisions on an impulse, which makes most of the bad outcomes.