While we don't get a lot of information about each character, we are able to observe a lot of their interactions. With very few words, we get a lot of insight into what the members of the football team are thinking. They love the game, they love the violence of it, and they want to be a part of a group with traditions. They manage to cultivate these things without the coach really understanding what is going on. That was a nice touch-- while it was a little disturbing that the coach didn't know what was going on, it was good to see that he hadn't condoned it and took steps to change the culture after it was brought to his attention.
Aside from investigating the highly relevant topic of concussions, this book also touched on the topics of internet citizenship and divorced parents, and scrutinized high school culture with sympathy and insight. Graced with one of the best covers I have ever seen on a football book, Game Changer is a timely look at how a beloved sport might not be serving its participants well. Buy two copies for schools where sports books are popular, because this will quickly wear out!