Roger is representative of the sadist in the novel because he partakes in evil for evil's sake and delights in causing unnecessary pain and hardship on the other boys. The first instance where we see Roger's sadism occurs when Roger spears Simon's pet lizard. The next instance where the sadism is evident occurs as Roger throws rocks at one of the other boys. Roger participated in Simon's death by the firelight in chapter nine. Finally, Roger's sadism is at its apex when he topples the rock on Piggy in chapter 11.