The devil figure
Ralph is the leader. Jack is the antagonist and rebel . Simon is the Jesus archetype.
Jack could represent the pig's head, and the flies could represent Jack's followers, how they are practically "swarming" around him.
Jack represents unbridled savagery and the desire for power.
Jack represents the defects of human nature that lead to the downfall of the boys on the island, savagery.
The FLIES are a representation of the evil and decay that exists in all humanity. Flies live on death, the flies do not care who of what you were, their job is to clean up the mess left behind. The flies also represent the boys, who are drawn to the evil that Jack represents just as the real flies are draw to the pig's head on the stick, which was an offering to the beast.
jack and Ralph or foils. jack is savage and violent, interested in killing and feasts Ralph is calm and represent civility and order, interseted in being rescued and maintaining order
Jack is jealous.
Jack never died
The Jack of Diamonds represents Hector, the mythological hero of the Iliad.
They represent the flags of England, Scotland and Northern Ireland.
It stands for JLS.
Jack is the antagonis(competitor, rival) of the story