Jack is a viscous kid who likes to be a leader and doesn't seem like he likes the island to much. A former choirmaster and "head boy" at his school, he arrived on the island having experienced some success in exerting control over others by dominating the choir with his militaristic attitude.
“I ought to be chief...because I'm chapter chorister and head boy. I can sing C sharp.” (chapter 1)
Piggy is the intellectual with poor eyesight, a weight problem, and asthma. He likes the island because there are no parents. He is the most physically vulnerable of all the boys, despite his greater intelligence.
"Acting like a crowd of kids!" (chapter 2)
Ralph is the athletic leader of the boys in the novel. He likes to be a leader and does like it on the island.
"Jack’s in charge of the choir. They can be—what do you want them to be?" (chapter 1)