Piggy is asthmatic, fat, and has glasses. "My auntie told me not to run on account of my asthma." "The fat boy looked startled." (Referring to Piggy)
Piggy is sensitive, trusting, quiet, and likley autistic. "Stillness descended on them, Ralph looking with more understanding at Piggy, saw that he was hurt and crushed." "The fat boy glanced over his shoulder, then leaned toward Ralph. He whispered."
In the story, Piggy is meant to represent the minority in civilization. The minority often doesn't have a voice in society and Piggy struggles to be heard in the story. He has to deal with hardships such as not being taken seriously, that the minority also have to deal with.
Throughout the story, Piggy becomes more talkative and comfortable around the boys. In the beginning he is super quiet, " Piggy shook his head and came to the pile." "Piggy was surrounded before he could walk away." Towards the middle of the story he becomes more assertive, "Piggy took the conch out of his hands. His voice was indignant."