Piggy's strongest and most valuable characteristics are also the ones that inspire the most mockery; after all, his practical intelligence makes him seem like a grown-up, which sets him apart from the other boys and makes him a target for their meanness.
Piggy's idea to make a list of the boys is something a teacher would do, so that they would know who is absent and who is late for meetings, for example. Though Piggy intends the idea to help everyone stay organized and safe, the idea makes him appear less spontaneous and fun. Piggy desperately wants to survive this perilous time, and he wants to contribute to the effort to help everyone else survive, but his methods are too much like something an adult would do. This side to his personality enhances the rough-and-tumble attitude of Jack and the thoughtful coolness of Ralph, as Piggy, though bright and intelligent, lacks the self-awareness to understand why his approaches are not as well-received as those of the other boys.