The nature of the question is a little indistinct and so I shall try to cover the question briefly in reference to the whole novel. If there is a particular part of the text that you need more help on, do post a further question.
The main other boy within the text is Piggy. It is clear from the start that he feels isolated socially from the other boys as a result of his social class - he is working class whereas many of the other boys are middle class or upper middle class. Golding creates this difference particularly through the way in which he makes Piggy use cockney pronunciation such as 'ass-mar' for asthma. This marks him out as different, just as his glasses mark him out with a sign of intellectualism and reason which he represents and which becomes increasingly irrelevant on the island as the boys descend towards a very primal way of life. The breaking of Piggy's glasses - which were used as a means of lighting the fire in the novel and thus providing a signal which would aid rescue - symbolises that as he becomes more distant from the other boys and more bullied, so they become more distant from the values of civilisation and increasingly descend into savagery. I could write a good deal more about
The other boys in the novel become increasingly indistinct as they wear the face paint of the hunters - they become one in their savagery and are, increasingly, drawn to Jack's tribe and his cruel, domineering and savage way of governing the island. Jack forces conformity upon them and obedience to his way of doing things so much that it is difficult to make one out from another. However, the little boy who cries early in the novel with the 'mulberry birthmark' goes missing after the first fire on the island and it seems clear that he has been killed during the fire, the first death on the island. His death is used by Golding as an early foreshadowing of the deaths to come on the island and the descent of the boys into uncontrolled savagery.
Piggy is the only boy on the island that has sense. He thinks about the future of all the boys. Piggy tries to plan how the boys can either maintain their life on the island or how to be rescued. Most of the other boys on the island do not think about the next day, all they care about is the moment. The boys are reckless; meaning they let the fire burn out, they do not replace the water, and they do not for their next meal.