Who is Piggy?

Piggy is the "nerd" of the group who, in some ways, is the most different of the group. He is fat, has asthma, and generally is one who can be made fun of. He becomes the one who is sacrificed when a rock is thrown down on him. He is Ralph's lieutenant and does the most to make suggestions that could get them rescued.

Hahahaha... piggy's a funny name. But I'm being totally serious... really... how is piggy a "Nerd"? He don't sound like a nerd. Wait... so piggy died cause a rock fell on his own head? Ouch!