Summary of characters in Kestrel for a knave?

"Kestrel for a Knave" features several key characters, primarily focusing on Billy Casper, a troubled teenager who finds solace in training a kestrel. His life is marked by a difficult home environment and bullying at school, which heightens his desire for freedom and connection with nature. The character of Mr. Farthing, Billy's teacher, represents authority and societal expectation, while Billy's brother, Jud, embodies a more aggressive and oppressive familial presence. Together, these characters illustrate themes of isolation, escape, and the struggle for identity.