Who are the characters in my brother's pecular chicken?

In "My Brother's Peculiar Chicken" by M. J. McGowan, the main characters are the narrator, a young boy, and his brother, who is known for his unusual pet chicken. The story explores their relationship and the humorous situations that arise from the brother's peculiar chicken, which exhibits strange behaviors. Other characters include their family members, who react to the chicken's oddities, adding depth to the narrative.