The word that would most likely describe the voice of the book 'The Absolutely True Diary of a Part-Time Indian would definitely be self-depreciating. Yes, the story is realistic as it is based on a true story but through out the whole book he is critical of him-self and uses humor to hide emotions and depreciate himself. This can be concluded from the text and the illustrations in the book.
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The types of Emotions that are emphasized through the author's use of the first person point of view would be Happiness, sadness, pretty much any emotion.
The best method a writer can use to present an argument is order of outstanding feature. The outstanding<span> or marked property will attract all the attention and that is the argument. </span>