Huckleberry Finn, son of the town drunkard Pap Finn and a deceased mother, endures neglect. He often sleeps outdoors or in barrels, relying on others for food and clothing. Pap reappears only upon learning of Huck's adoption by the wealthy Widow Douglas, seeking financial gain. The Widow adopted Huck after he saved her life, providing shelter and education. Huck resists her attempts to "civilize" him through schooling and societal rules.

His central friendship is with Tom Sawyer, who envies Huck's unrestricted life. They share adventures like treasure hunting, rafting on the Mississippi, and exploring caves. Huck gradually replaces Joe Harper as Tom's primary companion. Huck's personality blends innocence, superstition, and disregard for rules. He frequently "borrows" items like watermelons, chickens, boats, and cigars, later expressing remorse. Despite lacking formal education, he possesses a developing moral compass. This is evident when he aids Jim, a slave fleeing to freedom, prioritizing empathy over prevailing prejudices.

Later, Huck fakes his death to escape Pap's abuse. He encounters Jim on Jackson Island and they journey together on a raft toward the Ohio River, seeking freedom from slavery for Jim and from Pap for Huck. This adventure underscores Huck's growth through ethical dilemmas and danger. His appearance reflects his impoverished background: oversized, ragged hand-me-downs, a torn straw hat, often barefoot, with a single suspender holding up his trousers.