"Christine" Characterization

The main character of the 1983 novel Christine by Stephen King goes by the name of Arnie Cunningham. He is a 17-year old just living his life normally, with his parents, best friend Dennis and his girlfriend Leigh. One day, him and Dennis are driving down the road when he sees an old 1958 Plymouth Fury for sale. Arnie falls in love, and buys it from the racist, patriotic Ronald LeBay, an army dischargee. He buys it for $250, restores it and calls it his own. Something significant about Arnie is that he is way too eager. He instantly buys the car he sees in rough condition in a yard on the road with his best bud. Speaking of which, his best bud disapproves of Arnold's purchase. I have only read the first few bits, but this is all I got in this category.