Christopher John Francis Boone
Narrator and Protagonist, 15 years old
Defining characteristi: inability to imagine the thoughts and feelings of other people
This characteristic as well as a few others—Christopher’s difficulty understanding metaphors, his fixation on certain topics, and his computer-like ability with numbers—strongly suggest that Christopher has a mild form of autism.
He's extraordinarily gifted in math and science.
Autism is not mentioned by name anywhere in the novel, but we see that he recognizes the ways he differs from most people and feels keenly aware of these differences.
Christopher shows a growing desire for independence throughout the novel, and through much of the novel we watch as Christopher gains the confidence to assert himself.