Enrico Bottini is a schoolboy in late 19th-century Turin, Italy, documenting his experiences through journal entries that form the narrative's foundation. He belongs to a working-class family: father Alberto, mother Silvia, younger brother Nino, and sister Adriana. This background occasionally leaves him feeling like an outsider among wealthier peers, feeding initial insecurities.

Innately kind and empathetic, Enrico consistently shows concern for others. He forms strong bonds with classmates, often mediating conflicts and offering emotional support. Though generally mild-mannered and introspective, he navigates personal challenges related to identity and social integration. Enrico exhibits thoughtfulness and reflection, contemplating his own motivations and beliefs while remaining sensitive to the struggles around him.

His development focuses on maturation through everyday school and home experiences. Initially somewhat meek and insecure, Enrico gradually builds confidence under his teacher Mr. Perboni's guidance. Key moments involve confronting personal secrets, witnessing and intervening in bullying incidents, and reconciling family expectations. His relationship with his father Alberto, whose mischievous childhood contrasts with Enrico's reserved nature, evolves through shared experiences. The narrative concludes as Enrico faces a significant emotional challenge when his family relocates due to his father's job transfer, forcing him to leave established friendships and community.

Enrico maintains close relationships with dependable classmate Garrone and bookish Stardi. His interactions extend beyond his immediate friend group, demonstrating genuine interest in understanding diverse peer perspectives. Family relationships remain central, particularly his protective dynamic with Nino and his evolving understanding of his father's past. These connections collectively shape his recognition of compassion as a fundamental value.