How are Jack, Ralph, Piggy, and Simon archetypal characters in Lord of the Flies?

Anis a character that is found in ancient and modern
stories.

Hero , the first one seen,
changes most. The conch gives him special powers.

But
there was a stillness about Ralph as he sat that marked him out: ... yet most powerfully, there
was the conch. (ch 1)

Ralph is described as set apart
and he is chosen as a leader because he is the being that had blown the conch. 

Ralph is given a leadership role. He is not quite like the others and the others look
up to him because of the conch.

Ralph is the first one found.  He cries when
he sees his rescuers, because he realizes he will never be the same after the savagery he
witnessed on the island. 

His voice rose under the black
smoke before the burning wreckage of the island; and infected by that emotion, the other little
boys began to shake and sob too. (ch 10)

Ralph, who
represents civilization, mourns the loss of his innocence.  The others are still following his
lead. 

Villain  is the villain, or enemy of...