How does Mark Haddon use to the elements of voice to create a unique character?

Mark Haddon creates a unique character, Christophe, by making the character not able to understand all that is being told to him. He has almost no clarity about social aspects such as just hitting people because he feels like it. As in the book, “The Policeman took hold of my arm and lifted me on to my feet. I didn’t like him touching me like this. And this is when I hit him.” Pg8-9 The Problem of this character is that for him the normal does not seem normal and this makes him loose himself, “I rolled back onto the lawn and pressed my forehead to the ground again and made the noise father calls groaning.” Pg8-9

Mark Haddon also creates a unique character by giving the speaking people different vocabularies. As by Christophe he gives him a very small vocabulary to make him use the same words in different ways all the time. This creates a slight atmosphere of misunderstanding of other characters behaviors. Christophe mostly speaks very simple but when he speaks about maths or sciences he gets a complete different voice to let this aspect of him stick out more than the rest he talks about, this is to prove his intelligence in one way but make him slow minded in other areas, “And I thought about this and said ‘215,864’. Because it was a really easy sum because you just multiply 864 x 1,0000 and which is 864,000. Then you divide by 4 and that’s 216,000 and that’s 259 x 864.”