All of the characters in Lord of the Flies, except for the naval officer who arrives at the end, lost their innocence to some extent. This process is cut off for Simon and Piggy, the two boys who die. Ralph gains the maturity to save his own life, at least long enough to be rescued. For the other boys, the loss of innocence is closely associated with their transition to becoming killers, first of animals and then of human beings. While Simon’s death is accidental, the group of boys functions as a single entity in murdering Piggy. Further, they are all complicit in hunting Ralph with the intention of killing him as well.
Two characters who stand out in this process are the twins, Sam and Eric. Part of their uniqueness in being twins is that the loss of identity includes loss of their individual identities. Their merging into a single person conceptually, Samneric, rather than two distinct boys represents the melding of all the boys into a single collectivity. Samneric are not part of the first hunting party because they fear the forest, but they are envious of the hunters and tempted by the thought of meat.
Samneric took the conch.
"That must be fun like Bill says—and as he's invited us—"
"—to a feast—"
"—I could do with some meat—"
When they leave with Bill, Ralph understands both the attraction and the falseness. He knows they went for meat,
"And for hunting," said Ralph, wisely, "and for pretending to be a tribe, and putting on war-paint."
The twins later insist they left early from the dance when Simon died, and for a while, they continue to resist cooptation into the group of killers. When they prepare to go with Ralph to retrieve Piggy’s stolen glasses, they express concern over the other boys’ paint. The destruction of Ralph’s leadership is symbolized when the painted boys imprison the twins, who protest in civilized British terms.
Samneric protested out of the heart of civilization.
"Oh, I say!"
Poking them in the ribs with a spear, Jack insists they join the tribe. Ralph has no choice but to leave them with the tribe and try to plan another attack. From below, as he hears the whole tribe chanting “Kill the beast,” he had to face reality.
Ralph ... accepted this new fact like a wound. Samneric were part of the tribe now. They were guarding the Castle Rock against him. There was no chance of rescuing them and building up an outlaw tribe at the other end of the island. Samneric were savages like the rest.