What is the author's style in Will Grayson, Will Grayson by John Green?

Green and Levithan write Will Grayson, Will Grayson in the alternating first person point of view of the two Will Graysons. The combination of these two points of view allows the reader to get a sense of the plot through the lenses of two people who have entirely different lives and become involved in different ways. Then, when their lives intersect, the reader has already formed a background knowledge regarding both Will and Grayson. Even though their lives are pretty different, when they meet, the course of their lives and their relationships with the people within them begin to change.