Simon has very little interaction with the littluns other than picking fruit which they cannot reach as he passes though a group of them on his way to his 'secret place' in the jungle. Essentially Simon is a loner but what contact he has with other boys tends to be with the bigguns, in particular Ralph.
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Simon
Simon
Jack, Roger, and the Littluns kill Simon when he shows up to warn them.
i would say Simon because he is like the peacemaker and represents the good of humanity.
The undisputed littluns are described as being around six years old. Ralph is the oldest boy and he is twelve years and a few months old. Simon is described as being in the dubious region between littluns and biguns so presumably he is around 8 or 9 years old.