Huckleberry Finn is the protagonist and narrator of Adventures of Huckleberry Finn. He is 12 or 13 years old at the time of the events in "Tom Sawyer" and would be a year older at the time of the major events of the book "Huckleberry Finn". Huck also appears in The Adventures of Tom Sawyer and narrates Tom Sawyer, Detective and Tom Sawyer Abroad, as well as the unfinished Huck Finn and Tom Sawyer Among the Indians and Tom Sawyer's Conspiracy. He is also Tom Sawyer's closest friend. Their friendship is partially rooted in Sawyer's emulation of Huck's freedom and ability to do what he wants, when he wants. In one moment in the novel, he openly brags to his teacher that he was late for school because he stopped to talk with Huck Finn, something for which he knew he would (and did) receive a whipping. Nonetheless, Tom remains a devoted friend to Huck in both the novels they appear in. For his part, Huck recognizes Sawyer's emulation of him and his lifestyle, however he tends to view Sawyer as his closest (and perhaps only real) friend.
Brad Renfro's portrayal of the free spirit is one of a close to heart idea of mine. The 1995 film Tom and Huck struck a chord with me as I also had many of the characteristics of the ragged dressed, long haired, danger embracing, tree hugger known as Huck.