Roger

At first, Roger is shy and withdrawn.  but Roger later becomes malicious. He has seemingly no conscience and is savage and simple-minded. Roger is kind of a sadist who takes pleasure in seeing other living things in pain or agony. he is a rare kind of human-being, and that he is so aggressive and likes to have power and authority over living things 

Roger is a sadistic character. While Jack wants power because he likes the thought of being in charge, Roger wants power because he likes the idea of hurting others. While at first he was held back by the old “taboos” of civilized society , he soon passes this and gives in to his horrible urges to kill and torture.

Initially, in a mean-spirited prank, Roger throws rocks at the unsuspecting littlun, Henry, but he throws them so that they miss, surrounded as Henry is by "the protection of parents and school and policeman and the law. Roger's arm was conditioned by . . . civilization." Once he joins Jack's tribe, he has lost that conditioning and eventually performs the ultimate act of intentional cruelty toward Piggy.He is described in Chapter 1 as a boy "who kept to himself with avoidance and secrecy." His secret is that he is, in some ways, more evil than even Jack. All his life, Roger has been conditioned to leash or mask his impulses. The "irresponsible authority" of Jack's reign offers him the chance to unleash his innate cruelty.

Roger