The Question and Answer section for Lord of the Flies is a great resource to ask questions, find answers, and discuss the novel.
Much like Piggy, Chuck is chubby and socially awkward. Both Chuck and Piggy are naive about scocial mores that the other boys take for granted.
This depends on what chapter you are referring to?
As the boys argue and fret about an external beast, it is only Simon that has the insight to claim that the only "beast" on the island lies in their own hearts. It is only humanity that holds evil rather than any outside force imposing it.